Product Specification Low-Power Green-Mode PWM Flyback Power Controller without Secondary Feedback SG6849 FEATURES Linearly Decreasing PWM Frequency Green-Mode under Light-Load and Zero-Load Conditions Constant Voltage (CV) and Constant Current (CC) No Secondary Feedback Low Startup Current (5uA) Low Operating Current (3.6mA) Leading-Edge Blanking Constant Power Limit Universal AC Input Range Synchronized Slope Compensation 150°C OTP Sensor with Hysteresis VDD Over Voltage Clamping Cycle-by-Cycle Current Limiting Under Voltage Lockout (UVLO) Fixed PWM Frequency (65kHz/100kHz) Gate Output Maximum Voltage Clamped at 16.7V Small SOT-26 Package DESCRIPTION This highly integrated PWM controller provides several features to enhance the performance of low power flyback converters. To minimize standby power consumption, the proprietary green-mode function provides off-time modulation to linearly decrease the switching frequency under light-load and zero-load conditions. This green-mode function enables the power supply to easily meet international power conservation requirements. The supply voltage VDD is also used for feedback compensation, to regulate the output voltage without requiring a conventional TL431 and a photo-coupler. Another advantage of the SG6849 is that the typical startup current is only 5uA, while the typical operating current can be as low as 3.6mA. A large startup resistance could be used to achieve even higher power conversion efficiency. Built-in synchronized slope compensation maintains the stability of peak current-mode control. Proprietary internal compensation ensures constant output power limiting over a universal range of AC input voltages, from 90VAC to 264VAC.The SG6849 provides many protection functions. Pulse-by-pulse current limiting ensures a constant output current, even if a short circuit occurs. Also, the internal protection circuit will disable PWM output, if VDD exceeds 22.7V. The gate output is clamped at 16.7V to protect the power MOS from over-voltage damage. The built-in over temperature protection (OTP) function will shutdown the controller at 150°C with a 20°C hysteresis. The SG6849 is designed to provide a low-cost total solution for flyback converters. It is available in a small footprint, 6-pin, SOT-26 package. APPLICATIONS Low-power flyback power converters, such as Battery chargers for cellular phones, cordless phones, PDAs, digital cameras, and power tools. Power adapters for ink jet printers, video game consoles, and portable audio players. Open-frame SMPS for TV/DVD standby and other auxiliary supplies, home appliances, consumer electronics, and PC 5V standby-power. Replacements for linear transformers and RCC SMPS. TYPICAL IC APPLICATION VIN RIN D1VDD GATE DOCOWAUXVOQ1CIN SENSE GND RS © System General Corp. Version 1.0(IRO33.0002.B3)
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Product Specification Low-Power Green-Mode PWM Flyback Power Controller without Secondary Feedback SG6849 MARKING INFORMATION PIN CONFIGURATION SG6849-ZZZD 1 XXXXXXXYYWWV SOT-26 M: Mask Version MXYWW X: B= SG6849-65T C= SG6849-100T Y: Year 1 WW: Work Week GNDFBNC1236 5 4 GATE VDD SENSE 8 ZZZ: 65 or 100 XXXXXXX: Wafer LotYY: Year WW: Week V: Assembly Location GATEVDDNCSENSE1234DIP-8 8 7 6 5 GND FB NC NC ORDERING INFORMATION Part Number PWM Frequency Package 6-Pin SOT-26 6-Pin SOT-26 8-pin DIP-8 8-pin DIP-8 SG6849-65T 65kHz SG6849-100T 100kHz SG6849-65D 65kHz SG6849-100D 100kHz PIN DESCRIPTIONS Name GATE Pin No. Type Function DIP-8 SOT-26 1 6 5 Driver Output The totem-pole output driver to drive the power MOSFET. Supply Power supply. NC pin. Current sense. It senses the voltage across a sensed resistor. To provide over-current VDD 2 NC 3 NA SENSE 4 4 Analog Input protection, PWM output is disabled if the voltage exceeds an internal threshold. This pin also provides current information for current-mode control. NC pin. NC pin. Feedback. The FB pin provides feedback information to the internal PWM comparator. NC 5 3 NC 6 NA FB 7 2 GND 8 1 Analog Input This feedback is used to control the duty cycle. When no feedback is provided, this pin is left open. Supply Ground. © System General Corp. Version 1.0(IRO33.0002.B3)
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Product Specification Low-Power Green-Mode PWM Flyback Power Controller without Secondary Feedback SG6849 BLOCK DIAGRAM GND8(1)OTP SENSE VDD Driver1(6) GATEInternal Supply VDD 2(5) OSC SRQPWMCompPowerLimiterSlopeCompensationOCPCompVDDBlanking Circuit 4.5V 4(4) SENSEUVLO17V/8VGreen Mode Controller ΣVDD VDDZ7(2) FB DIP-8(SOT-26) © System General Corp. Version 1.0(IRO33.0002.B3)
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Product Specification Low-Power Green-Mode PWM Flyback Power Controller without Secondary Feedback SG6849 ABSOLUTE MAXIMUM RATINGS Symbol Parameter DC Supply Voltage* VDD VFB VSENSE Zener Clamp Zener Current FB Pin Input Voltage Sense Pin Input Voltage SOT-26 DIP-8 SOT-26 DIP-8 Value 25 30 10 -0.3 to 7 -0.3 to 7 300 243.3 113.0 115 67.1 150 -55 to +150 20 sec SOT-26 10 sec DIP-8 220 260 3.0 300 Unit V V mA V V mW °C/W °C/W °C °C °C kV V PD Power Dissipation RθJA RθJC TJ TSTG TL Thermal Resistance (Junction to Air) Thermal Resistance (Junction to Case) Operating Junction Temperature Storage Temperature Range Lead Temperature (Soldering) ESD Capability, Human Body Model ESD Capability, Machine Model *All voltage values, except differential voltages, are given with respect to the network ground terminal. OPERATING CONDITIONS Symbol Parameter VDD TA DC Supply Voltage Operating Ambient Temperature Value -30 to +85 Unit °C <22.7 V ELECTRICAL CHARACTERISTICS (VDD=15V, TA=25°C) Feedback Input Section Symbol Parameter IOZ VFB RFB VDDZ Zero Duty-Cycle FB Input Current Open Loop Voltage Input Impedance VDD Feedback Threshold Voltage* Test Condition FB Input Current = 0.1mA FB Input Current = 0mA FB Input Current = 0.8mA Min. Typ. Max. Unit 20 18 1.15 4.5 2.4 22.7 20 1.4 25 22 mA V kΩ V V *The feedback input is pulled by a transistor that is controlled by the VDD signal while VDD ≧ VDDZ. © System General Corp. Version 1.0(IRO33.0002.B3)
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Product Specification Low-Power Green-Mode PWM Flyback Power Controller without Secondary Feedback SG6849 Current Sense Section Symbol Parameter TPD Propagation Delay Test Condition Min. VDD 20V Typ. Max. Unit ns 100 0.84 0.89 0.94 V 0.72 0.77 0.82 V 0.58 0.63 0.68 V 0.76 0.81 0.86 V 0.65 0.70 0.75 V 0.52 0.57 0.62 V Current Limiting Valley Threshold Voltage for 65kHzVDD 15V VTH,VA VDD 10V VDD 20V Current Limiting Valley Threshold Voltage for 100kHzVDD 15V VDD 10V TON TOFFVLIMIT RampVTH,FT 0.77V High-Line Sense VoltageLow-Line Sense Voltage ======VTH,VA 0V T1 T2 Oscillator Section Symbol Parameter FOSC SG6849–65 Frequency FOSC SG6849–100 Frequency FOSC-G-BK IFB-G-OFF FDV VDD-TH-G Green-Mode Burst Back Frequency* Green-Mode OFF FB Input Current Frequency Variation versus VDD Deviation VDD-Low Threshold Voltage for Exiting Green-Mode OFF FOSC-G-OFF Green-Mode OFF Frequency* Test Condition Min. Typ. Max. Unit VDD = 10 to 20V 60 65 70 kHz 92 100 108 kHz 20 0.9 VDD OFF+1.0 25 0 1.15 VDD OFF+1.5 30 1.4 2 VDD OFF+2.0 kHz kHz mA % V *Please see the “Green-Mode Burst Back (FOSC-G-BK) and Green-Mode OFF Frequency (FOSC-G-OFF) vs. VDD” curves. © System General Corp. Version 1.0(IRO33.0002.B3)
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Product Specification Low-Power Green-Mode PWM Flyback Power Controller without Secondary Feedback SG6849 Output Section Symbol Parameter DCYMAX Maximum Duty Cycle Bnk Leading Edge Blanking Time VOL Output Voltage Low VOH Output Voltage High TR VCLAMP Rising Time Output Clamp Voltage TF Falling Time Test Condition Min. Typ. Max. Unit VDD = 15V, IO = 10mAVDD = 15V, IO = 10mAVDD = 15V, CL = 1nF VDD = 15V, CL = 1nF VDD = 20V 70 75 80 % 8 310 200 80 16.7 1.5 18 ns V V ns ns V Over Temperature Protection (OTP) Symbol Parameter Temp-Off *1*2*1*2Test Condition Min. Typ. Max. Unit 150 °C 130 °C Protection Junction Temperature Temp-Restart Restart Junction Temperature When activated, the output is disabled and the latch is turned off. This is the threshold temperature for enabling the output again and resetting the latch, after over temperature protection has been activated. VDD Section Symbol Parameter VDD ON VDD OFF Turn-On Threshold Voltage Turn-Off Threshold Voltage Test Condition Min. Typ. Max. Unit VDD = 15V VDD = 15V GATE is Open IDD = 10mA 16 7.5 17 8 5 18 8.5 30 V V uA IDD ST Startup Current IDD OP VDD CLAMP Operating Supply Current Zener Diode Breakdown Voltage 3.6 6 mA 28 30 V © System General Corp. Version 1.0(IRO33.0002.B3)
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Product Specification Low-Power Green-Mode PWM Flyback Power Controller without Secondary Feedback SG6849 TYPICAL CHARACTERISTICS SG6849-65 Start-Up Current (IDD ST) vs. Temperature9.0 4.5Operating Supply Current (IDD OP) vs. Temperature8.04.3VDD=15.0V4.0IDDOP (mA)VDD=15.0V7.0IDDST (uA)6.03.85.03.54.03.33.0-40-25-1052035506580951101253.0-40-25-105203550658095110125TEMPERATURE (℃)TEMPERATURE (℃)VFB Open Loop Voltage (VFB) vs. Temperature5.0 80.0Maximum Duty Cycle (DCYMAX) vs. Temperature4.8VDD=15.0V78.0VDD=15.0VDCYMAX (%)-40-30-1502550751001254.6VFB (V)76.04.474.04.272.04.070.0-40-25-105203550658095110125TEMPERATURE (℃)TEMPERATURE (℃)Oscillator Frequency (FOSC) vs. Temperature70.0 0.80Valley Threshold Voltage (VTH,VA) vs. Temperature65.0FOSC (kHz)0.78VDD=15.0V0.76VDD=15.0V0.7460.055.00.7250.0-40-25-105203550658095110125VTH,VA(V)0.70-40-25-105203550658095110125TEMPERATURE (℃)TEMPERATURE (℃) © System General Corp. Version 1.0(IRO33.0002.B3)
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Product Specification Low-Power Green-Mode PWM Flyback Power Controller without Secondary Feedback SG6849 Turn-On Threshold Voltage (VDD ON) vs.Temperature18.017.517.0VDDON (V)16.516.07.5015.515.0-40-25-105203550658095110125 9.00Turn-Off Threshold Voltage (VDD OFF) vs.Temperature8.50VDDOFF (V)8.007.00-40-25-105203550658095110125TEMPERATURE (℃)TEMPERATURE (℃)Output Voltage Low (VOL) vs. Temperature0.40 30.0Green-Mode Burst Back(FOSC-G-BK) and Green-ModeOFF Frequency(FOSC-G-OFF) vs. VDDFOSC-G-BK25.00.3020.00.20FOSC (kHz)VOL (V)15.00.1010.05.00.00-40-25-1052035506580951101250.088.59VDD (V)9.510FOSC-G-OFFTEMPERATURE (℃)Valley Threshold Voltage(VTH,VA) vs. VDD1.00 1.10VLIMIT Ramp vs. Duty Cycle0.901.05VTH,VA (V)Vlimit (V)0.80VDD=15.0V1.000.700.600.950.50910111213141516171819200.9010152025Duty Cycle (%)303540VDD (V) © System General Corp. Version 1.0(IRO33.0002.B3)
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Product Specification
Low-Power Green-Mode PWM Flyback Power Controller without Secondary Feedback SG6849
OPERATION DESCRIPTION
SG6849 devices integrate many useful functions for low power switch mode power supplies. The following descriptions highlight the key features of the SG6849.
Over Temperature Protection (OTP)
The SG6849 has a built-in temperature sensing circuit to shut down PWM output once the junction temperature exceeds 150°C. While PWM output is shut down, the VDD voltage will gradually drop to the UVLO voltage. Some of the SG6849’s internal circuits will be shut down, and VDD will gradually start increasing again. When VDD reaches 17V, all the internal circuits, including the temperature sensing circuit, will start operating normally. If the junction temperature is still higher than 150°C, the PWM controller will be shut down immediately. This situation will continue until the temperature drops below 130°C. The PWM output will then be turned back on. The temperature hysteresis window for the OTP circuit is 20°C.
Startup Current
The required startup current is only 5uA. This allows a high-resistance, low-wattage startup resistor to be used to supply the controller’s startup power. A 1.5 MΩ/0.25W startup resistor can be used over a wide input range (100V-240V AC) with very little power loss.
Operating Current
The operating current is normally 3.6mA. The low operating current results in higher efficiency and reduces the required VDD hold-up capacitance. A 10uF/25V VDD hold-up capacitor can be used over a wide input range (100V-240V AC) with very little power loss.
VDD Over Voltage Clamping
VDD over voltage clamping is built in to prevent damage from over-voltage conditions. When VDD exceeds 22.7V, PWM output is shut down. Over-voltage conditions may be caused by an open photo-coupler loop or a short circuit in the output.
Green Mode Operation
The proprietary green-mode function provides off-time modulation to linearly decrease the switching frequency under light-load and zero-load conditions. The on-time is limited to provide better protection against brownouts and other abnormal conditions.
Oscillator Operation
The oscillation frequency is fixed at 65kHz for the SG6849-65, and at 100kHz for the SG6849-100.
This green-mode function dramatically reduces power
Leading Edge Blanking consumption under light-load and zero-load conditions.
Power supplies using the SG6849 can easily meet Each time the power MOSFET is switched on, a turn-on international restrictions regarding standby spike will inevitably occur at the sense-resistor. To avoid power-consumption. premature termination of the switching pulse, a 310ns
Constant Voltage (CV) and Constant Current (CC) without Feedback
The SG6849 can tightly regulate the output voltage and provide over current protection without requiring secondary-side feedback signals. For improved CV and CC accuracy, the transformer leakage inductance should be reduced as much as possible.
© System General Corp. Version 1.0(IRO33.0002.B3)
leading-edge blanking time is built in. Conventional RC filtering is not necessary. During this blanking period, the current-limit comparator is disabled, and it cannot switch off the gate drive.
Constant Output Power Limit
When the SENSE voltage across the sense resistor RS reaches the threshold voltage (around 1.0V), the output GATE drive will be turned off following a small - 9 -
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Product Specification
Low-Power Green-Mode PWM Flyback Power Controller without Secondary Feedback SG6849
propagation delay TPD. This propagation delay will introduce an additional current proportional to TPD*VIN/LP. The propagation delay is nearly constant regardless of the input line voltage VIN. Higher input line voltages will result in larger additional currents. Thus, under high input-line voltages the output power limit will be higher than under low input-line voltages.
Over a wide range of AC input voltages, the variation can be significant. To compensate for this, the threshold voltage is adjusted by adding a positive ramp. This ramp signal can vary from 0.77V to 1.05V for SG6849-65 and 0.70 to 1.03V for SG6849-100, and it flattens out at 1.05V and 1.03V respectively. A smaller threshold voltage forces the output GATE drive to terminate earlier, thus reducing total PWM turn-on time and making the output power equal to that of the low line input. This proprietary internal compensation feature ensures a constant output power limit over a wide range of AC input voltages (90VAC to 264VAC).
Gate Output
The SG6849 BiCMOS output stage is a fast totem pole gate driver. Cross-conduction has been avoided to minimize heat dissipation, increase efficiency, and enhance reliability. The output driver is clamped by an internal 16.7V Zener diode in order to protect the power MOSFET transistors against any harmful over-voltage gate signals.
Slope Compensation
The sensed voltage across the current sense resistor is used for current mode control and pulse-by-pulse current limiting. The built-in slope compensation function improves power supply stability. Furthermore, it prevents sub-harmonic oscillations that normally would occur because of peak current mode control. A positively sloped, synchronized ramp is activated by the SG6849 with every switching cycle. The slope of the ramp is
0.33×Duty. Duty(max)
Under Voltage Lockout (UVLO)
The turn-on/turn-off thresholds of the SG6849 are fixed internally at 17V/8V. To enable the SG6849 during startup, the hold-up capacitor must first be charged to 17V through the startup resistor.
The hold-up capacitor will continue to supply VDD before energy can be delivered from the auxiliary winding of the main transformer. VDD must not drop below 8V during this startup process. This UVLO hysteresis window ensures that the hold-up capacitor can adequately supply VDD during startup.
Noise Immunity
Noise from the current sense or the control signal may cause significant pulse width jitter, particularly in continuous-conduction mode. Slope compensation helps alleviate this problem. Good placement and layout practices should be followed. The designer should avoid long PCB traces and component leads. Compensation and filter components should be located near the SG6849. Finally, increasing the power-MOS gate resistance is advised.
© System General Corp. Version 1.0(IRO33.0002.B3)
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Product Specification Low-Power Green-Mode PWM Flyback Power Controller without Secondary Feedback SG6849 REFERENCE CIRCUIT 3W Flyback 5V/0.6A Circuit, without Secondary-Side Feedback 1LF1BD1+41L12CX12-C1+R1C21C3R5R3R410T11,2D4211L22NVO3R2D1229R1085C7C8+1U4123GNDFBNCSG6849GATEVDDSENSE654R7D52+C913Q173,4GNDR6R8+D212CY1C4 BOM Symbol Component BD1 BD 1A/500V CX1 (Option) CY1 (Option) C2 C1 C3 C4 C7 (Option) C8 C9 D1 D2 D5 (Option) YC 472pF/400V (Y1) YC 102pF/400V (Y1) CC 103pF/500V CC 1000pF/500V EC 10uF/50V CC 102pF/100V 1206 EC 220uF/10V 105℃ Diode FRI07 Diode FR102 ZD 6.8V 0.5W Symbol Component L1 L2 Q1 R3,R4 R5 R6 R7 R10 (Option) T1 U4 20mH 6*8mm 10uH 6mm MOSFET 1A/600V R 47kΩ 1206 R 47Ω 1206 R 4.7Ω 1206 R 100Ω 0805 R 10Ω 1206 EE-16 IC SG6849 (Green PWM IC) EC 10uF/400V 105℃ R1,R2 R 750kΩ 1206 EC 470uF/10V 105℃ R8 R 10Ω 1206 D4 Diode SB360 F1 R 1Ω/0.5W © System General Corp. Version 1.0(IRO33.0002.B3)
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Product Specification Low-Power Green-Mode PWM Flyback Power Controller without Secondary Feedback SG6849 3W Flyback 5V/0.6A Circuit, with Secondary-Side Feedback F11L11BD1+4+C1+C2R5R4101985Q11321R1022C7+C8T11,22D411L22C3R32L2-NR13VoD1D5+C9R77R6U1SG6849123C6GNDFBNCGATEVDDSENSE6R854+C41D22R23,4GNDR11U2431R13R1423C10CY1U31R122
BOM Symbol Component BD1 (Reference only) C2 C1 C3 C4 C6 C7 C8 C10 D1 D2 D4 D5 (Option) L1 BD1 (Reference only) DI106 1A/600V CY1 (Option) YC 102p/400V 103p/500V (0.01uF/500V) 1000p/500V CER 10u/50V 5mm 472p 0805 102p/100V 1206 Symbol Component L2 10uH 6mm Q1 MOSFET 1A/600V R4,R3 R5 R6 R7 R10 R11 R12 R13 R14 T1 U1 U2 U3 L2 47k/1206 47 1206 3.7 1206 100 0805 10 1206 5 1206 100 1/8W 33k 0805 33k 1/8W 4.7k 0805 EE-16 SG6849 (Green PWM IC) PC817 TL431 10uH 6mm 10uF/400V 10Φ*16mm 105℃ R1,R2 750k 1206 470u/10V 8Φ*11.5mm 105℃ R8 222p 0805 FR107 FR102 SB360 (3A/60V; Schottky) ZD/6.8V 0.5W 20mH 6*8mm DI106 1A/600V C9 470u/10V 8Φ*11.5mm 105℃ F1 1Ω1/2W Resistor © System General Corp. Version 1.0(IRO33.0002.B3)
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Product Specification Low-Power Green-Mode PWM Flyback Power Controller without Secondary Feedback SG6849 PACKAGE INFORMATION The SOT-26 Package Db64Detail AE1E1e1e3c1RA2ALA1L11Detail A Dimensions: Symbol Millimeters Inches Min. Typ. Max. Min. Typ. Max. 1.45 0.151.15 1.30 0.50 0.222.90 2.80 1.60 0.95 1.90 0.45 0.600.60 0.25 0.254˚ 8˚10˚ 15˚0.057 0.006 0.051 0.020 0.009 0.24 0.25 8˚ 15˚ A A1 A2 0.90b 0.30c 0.08D E E1 e e1 L 0.30L1 L2 R 0.10R1 0.10θ˚ 0˚θ1˚ 5˚0.0360.0110.0030.0450.0200.1140.1100.0630.0370.0750.0180.0240.0100.0040.0040˚5˚4˚10˚ © System General Corp. Version 1.0(IRO33.0002.B3)
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Product Specification Low-Power Green-Mode PWM Flyback Power Controller without Secondary Feedback SG6849 The DIP-8 Package D85Θ°E1EeB14A1A2Lb1be Dimensions: Symbol Millimeter Inch Min. Typ. Max. Min. Typ. Max. 5.334 3.302 3.4291.524 0.457 9.271 10.1607.620 6.350 6.4772.540 3.302 3.8109.017 9.5257 150.0150.1250.210 0.135 0.400 0.255 0.150 0.375 15 A A1 0.381A2 3.175b b1 D 9.017E E1 6.223e L 2.921eB 8.509θ˚ 0A0.3550.2450.1150.33500.1300.0600.0180.3650.3000.2500.1000.1300.3557 © System General Corp. Version 1.0(IRO33.0002.B3)
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Product Specification
Low-Power Green-Mode PWM Flyback Power Controller without Secondary Feedback SG6849
DISCLAIMERS
LIFE SUPPORT
System General’s products are not designed to be used as components in devices intended to support or sustain human life. Use of System General’s products in components intended for surgical implant into the body, or other applications in which the failure of System General’s products could create a situation where personal death or injury may occur, is not authorized without the express written approval of System General’s Chief Executive Officer. System General will not be held liable for any damages or claims resulting from the use of its products in medical applications.
MILITARY
System General's products are not designed for use in military applications. Use of System General’s products in military applications is not authorized without the express written approval of System General’s Chief Executive Officer. System General will not be held liable for any damages or claims resulting from the use of its products in military applications.
RIGHT TO MAKE CHANGES
System General reserves the right to change this document and/or this product without notice. Customers are advised to consult their System General sales representative before ordering.
© System General Corp. Version 1.0(IRO33.0002.B3)
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