SG6105A Power Supply Supervisor + Regulator + PWM Features Description PC Half-Bridge (or 494) Power Supply Supervisor + two 431 + PWM High Integration with Few External Components SG6105A controller is designed for switching-mode power supplies for desktop PCs. It provides all the functions necessary to monitor and control the output of the power supply. Remote ON/OFF control, power-good circuitry, and protection features against over-voltage and over-power are implemented. It directly senses all the output rails for OVP without the need for external dividers. An innovative AC-signal sampling circuitry provides a sufficient power-down warning signal for PG. Over-Voltage Protection for 3.3V, 5V, and 12V Under-Voltage Protection for 3.3V, 5V, and 12V Under-Voltage Protection for -12V and/or -5V Over-Power and Short-Circuit Protection Power-Down Warning Circuitry Power-Good Circuitry Delay Time for PSON and PG Signal Remote ON/OFF Function On-Chip Oscillator and Error Amplifier Two Shunt Regulators for 3.3V and 5V-Standby Latching PWM for Cycle-by-Cycle Switching Push-Pull PWM Operation and Totem Pole Outputs A built-in timer generates accurate timing for the control circuit, including the PS-off delay. The cycle-by-cycle PWM switching prevents the power transformer from saturation and ensures the fastest response for the short-circuit protection, which greatly reduces stress for power transistors. Two internal precision TL431 shunt regulators provide stable reference voltage and a driver for 3.3V and 5V standby regulation. Utilizing minimum external components, the SG6105A includes the functions for push-pull and/or half-bridge topology, decreasing production cost and PCB space, and increasing the MTBF for power supply. Soft-Start and Maximum 93% Duty Cycle Applications Switching mode power supply for computers: AT NLX SFX (micro-ATX) Ordering Information Part Number Operating Temperature Range Eco Status Package Packing Method SG6105ADZ -40 to +105°C RoHS 20-pin Dual In-Line Package (DIP) Tube SG6105ADY -40 to +105°C Green 20-pin Dual In-Line Package (DIP) Tube For Fairchild’s definition of Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html. © 2008 Fairchild Semiconductor Corporation SG6105A • Rev. 1.0.2 www.fairchildsemi.com SG6105A — Power Supply Supervisor+Regulator+PWM July 2009 SG6105A — Power Supply Supervisor+Regulator+PWM Application Diagram SG6105A Figure 1. Typical Application © 2008 Fairchild Semiconductor Corporation SG6105A • Rev. 1.0.2 www.fairchildsemi.com 2 V33 V5 V12 UVAC RI PG GND VCC 2 3 7 5 19 10 15 20 VREF 2μA 0.7V DSD Delay 300ms UV Detector OV Protector OP1 Delay 3ms D SET CLR UV Protector 9 Q Q OP2 S SET 8 Q 3.2V R VCC 6 D 64μA 2.1V Delay 7ms Buffer SET Q O.S.C CLR 2.5V 13 Delay 7ms Buffer VREF1 FB2 OPP 11 Delay 15ms VCC PSON 1 14 Q 8μA 2.4V 4 Q FB1 5V NVP CLR 12 1.4V On/Off Delay 50ms 16ms SG6105A — Power Supply Supervisor+Regulator+PWM Block Diagram VREF2 Delay 2ms 18 17 16 SS IN COMP Figure 2. Function Block Diagram © 2008 Fairchild Semiconductor Corporation SG6105A • Rev. 1.0.2 www.fairchildsemi.com 3 20 T : D = DIP P : Z = Lead Free Null=Regular Ppackage XXXXXXXX: Wafer Lot Y: Year; WW: Week V: Assembly Location SG6105ATP XXXXXXXXYWWV 1 ※Marking for SG6105ADZ (Pb-free) F- Fairchild Logo Z- Plant Code X- 1 Digit Year Code Y- 1 Digit Week Code TT: 2 Digits Die Run Code T: Package Type (D=DIP) P: Y:Green Package M: Manufacture Flow Code ※Marking for SG6105ADY(Green compound) SG6105A — Power Supply Supervisor+Regulator+PWM Marking Information Figure 3. Top Mark Pin Configuration Figure 4. Pin Configuration (Top View) © 2008 Fairchild Semiconductor Corporation SG6105A • Rev. 1.0.2 www.fairchildsemi.com 4 Pin # Name Description 1 PSON Remote on/off logic input for CPU or controller. Turn on/off the PWM output after the 7.5ms / 26ms delay. PSON=0, the main SMPS is operational. PSON =1, the main SMPS is off and the latch is reset. 2 V33 3.3V over-voltage/under-voltage control sense input. 3 V5 5V over-voltage/under-voltage control sense input. 4 OPP 5 UVAC 6 NVP 7 V12 Over-power sense input. This pin is connected to driver transformer or the output of current transformer. When not in use, this pin should be grounded. AC fail detection. Detect main AC voltage under-voltage and/or failure. The protection input for negative output, such as –12V and/or –5V. Trip voltage=2.1V. 12V over-voltage/under-voltage control sense input. The totem-pole output drivers of push-pull PWM. The outputs are enabled (LOW) only when the NAND gate inputs are HIGH. The maximum duty cycle on an output (OP1 or OP2) is 46%. 9/8 OP1/OP2 10 PG Power-good logic output, 0 or 1 (open-collector). PG=1, the power is good for operation. The PG delay is 300ms. 11 FB2 Output for second converter regulation loop. 12 VREF2 Reference comparison input for second converter regulation loop, 2.5V. 13 VREF1 Reference comparison input for first converter regulation loop, 2.5V. 14 FB1 Output for first converter regulation loop. 15 GND 16 COMP Ground. 17 IN The negative input of error amplifier. The positive input of error amplifier is a 2.5V reference voltage. 18 SS Soft-start, settable through an external capacitor. The current source output at this pin is 8µA and the voltage is clamped at 2.5V. 19 RI Connected to external resistor for the reference setting. RI=75kΩ. 20 VCC Error amplifier output and the input of the PWM comparator. SG6105A — Power Supply Supervisor+Regulator+PWM Pin Definitions Supply voltage. 4.5V ~ 5.5V connected to 5V-standby. © 2008 Fairchild Semiconductor Corporation SG6105A • Rev. 1.0.2 www.fairchildsemi.com 5 Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings are stress ratings only. Symbol VCC IOUT VPIN PD TSTG Parameter Min. DC Supply Voltage at Pin 20 Output Current at PG, Fb1, Fb2 Pins Max. Unit 16 V 30 mA V12, OP1, OP2, FB1, FB2, SS -0.3 16.0 V PSON, V33, V5, VREF1, VREF2, OPP, UVAC, RI, NVP, IN, COMP, PG -0.3 7.0 V Power Dissipation (TA=25°C) 1.5 (TA=90°C) 0.5 Storage Temperature Range -55 W +150 °C θJA Thermal Resistance, Junction-To-Air 82.5 °C/W TJ Operating Junction Temperature +150 °C TA Operating Ambient Temperature +125 °C TL Lead Temperature (Soldering, 10 Seconds) ESD -30 Human Body Model, JESD22-A114 +260 °C 3 KV Notes: 1. All voltage values, except differential voltages, are given with respect to GND pin. 2. Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. SG6105A — Power Supply Supervisor+Regulator+PWM Absolute Maximum Ratings Recommended Operating Conditions The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not recommend exceeding them or designing to Absolute Maximum Ratings. Symbol TA Parameter Operating Ambient Temperature Range © 2008 Fairchild Semiconductor Corporation SG6105A • Rev. 1.0.2 Min. Max. Unit -40 +105 °C www.fairchildsemi.com 6 VCC=5V, TA= 25°C, RI=75KΩ, unless noted operating specs. Symbol ICC VOVP VUVP Parameter Conditions Min. Typ. 3.3V 3.9 5.0V 5.8 6.1 6.5 12.0V 13.9 14.5 14.9 3.3V 2.0 2.6 2.8 5.0V 3.0 3.6 3.9 12.0V 6.0 7.2 8.0 3.3V 2.5 2.8 3.0 5.0V 4.0 4.3 4.5 12.0V 9.4 10.1 10.4 2.25 2.32 2.39 V Total Supply Current Over-Voltage Protection Under-Voltage Protection PG High Max. Units 5 10 mA 4.1 4.3 V V VUVS Under-Voltage Sense for PG Low VOPP Over-Power Protection (3) (With TOPP Delay Time) VOPPH Over-Power Protection (Without Delay Time) 3.0 3.2 3.4 V Disable Under-Voltage / Over-Power Protection Threshold 0.2 0.3 0.4 V VNVP Negative Voltage Protection: Voltage Level 2.0 2.1 2.2 V INVP Negative Voltage Protection: Source Current 63 67 71 µA VX VUVAC=1.5V V TOVP Timing for Over-Voltage Protection 0.37 0.70 1.35 ms TUVP Timing for Under-Voltage Protection 0.80 2.40 3.75 ms TUVS Timing for Under-Voltage Sense for PG Low 0.37 1.20 1.88 ms TOPP Timing for Over-Power Protection 5 7 9 ms TNVP Timing for Negative Voltage Protection 3.3 7.0 10.2 Ms 2.475 2.500 2.525 V 20 mV SG6105A — Power Supply Supervisor+Regulator+PWM Electrical Characteristics Shunt Regulator Section Current VREF VDEV, I VDEV, T Reference Voltage IFB=0.5mA, TA=25°C (4) Deviation of VREF Over FB Current Deviation of VREF Over Temperature (4) IFB=0.5mA to 10mA (4) 10 4 ≦ VFB ≦ 15V REGLI-FB Line Regulation IOUT-FB** Output Sinking Current Capability (4) VFB=2V 1 10 30 mV mV/V mA Notes: 3. VOPPS=(2/3) x VOPP + (1/3) x VUVAC. 4. Not tested in production. Continued on following page… © 2008 Fairchild Semiconductor Corporation SG6105A • Rev. 1.0.2 www.fairchildsemi.com 7 VCC=5V, TA= 25°C, RI=75KΩ, unless noted operating specs. Symbol Parameter Conditions Min. Typ. Max. Units 200 300 400 ms 0.68 0.70 0.72 V CL=100pF, Pull 2.2K to 5V 1 3 µs CL=100pF, Pull 2.2K to 5V 300 500 ns Power-Good Section TPG Timing for PG Delay RI=75kΩ VUVAC UVAC Voltage Sense for PG TR Power-Good Output Rising (5) Time TF Power-Good Falling Time (5) VOL2 Power-Good Output Saturation Level IPG=5mA 0.5 V ION2 Power-Good Leakage Current Collector VPG=5V 1 µA Remote On/Off Section VIH High-Level Input Voltage VIL Low-Level Input Voltage VHYSTERESIS PSON Input Hysteresis Voltage 2 V 0.8 0.3 IPSON Remote Input Driving Current TPSON(ON) Timing PSON to On RI=75kΩ 38 TPSON(OFF) Timing PSON to Off (PS-off) RI=75kΩ TPSOFF Timing PG Low to Power Off RI=75kΩ V V 0.5 mA 50 62 ms 8 16 24 ms 1.5 2.0 6.3 ms 2.46 2.50 2.54 V 50 60 dB 0.3 1.0 MHz SG6105A — Power Supply Supervisor+Regulator+PWM Electrical Characteristics (Continued) Error Amplifier Section V2.5 IIB Reference Voltage Input Bias Current TA=25°C (5) 0.1 AVOL Open-Loop Voltage Gain BW Unity Gain Bandwidth PSRR (5) (5) Power Supply Rejection (5) Ratio 50 µA dB Oscillator Section fOSC PWM Frequency RI=75kΩ 62 65 68 KHz 7 8 9 µA 93 % 0.8 V Soft-Start Section ISS Charge Current Comparator Section DC Duty Cycle 85 PWM Output Section VOL Output Voltage Low IO=20mA VOH Output Voltage High V12=12V RO Output Impedance of VOH 4 1.5 V 3.3 KΩ Note: 5. Not tested in production. © 2008 Fairchild Semiconductor Corporation SG6105A • Rev. 1.0.2 www.fairchildsemi.com 8 2 .6 0 0 5.5 2 .5 5 0 VREF (V) ICC-OP(mA) 5.7 5.3 5.1 2 .5 0 0 2 .4 5 0 4.9 2 .4 0 0 -40 -25 -10 5 20 35 50 65 80 95 110 125 -40 -2 5 -10 5 Temperature (°C) 20 35 50 65 80 95 1 10 1 25 Temperature (°C) Figure 5. Operating Supply Current vs. Temperature Figure 6. Reference Voltage vs. Temperature 6.000 67.000 66.000 fOSC (KHz) VOH (V) 5.000 4.000 65.000 SG6105A — Power Supply Supervisor+Regulator+PWM Typical Performance Characteristics 64.000 63.000 3.000 -40 -25 -10 5 20 35 50 65 80 95 -40 -25 -10 110 125 5 Temperature (°C) 20 35 50 65 80 95 110 125 Temperature (°C) Figure 7. PWM Output Voltage vs. Temperature Figure 8. Frequency vs. Temperature 89.500 2.600 89.450 2.550 89.350 V2.5 (V) DCMAX (%) 89.400 89.300 89.250 2.500 89.200 89.150 89.100 -40 -25 -10 5 20 35 50 65 80 95 2.450 -40 -25 110 125 Figure 9. MAX Duty Cycle vs. Temperature © 2008 Fairchild Semiconductor Corporation SG6105A • Rev. 1.0.2 -10 5 20 35 50 65 80 95 110 125 Temperature (°C) Temperature (°C) Figure 10. Reference Voltage vs. Temperature www.fairchildsemi.com 9 4.180 2.610 2.600 4.160 VOVP (V) VUVP (V) 2.590 2.580 2.570 2.560 4.140 4.120 2.550 2.540 -40 -25 -10 4.100 5 20 35 50 65 80 95 110 125 -40 -25 -10 5 20 Temperature (°C) 3.700 6.180 3.600 6.160 3.500 3.400 5 20 35 50 65 80 95 80 95 110 125 6.140 6.100 -40 -25 -10 110 125 7.050 14.550 VOVP (V) 14.600 7.040 7.030 20 35 50 65 80 35 50 65 80 95 110 125 14.500 14.450 -40 -25 -10 95 110 125 Temperature (°C) 5 20 35 50 65 80 95 110 125 Temperature (°C) Figure 15. 12V VUVP vs. Temperature © 2008 Fairchild Semiconductor Corporation SG6105A • Rev. 1.0.2 20 Figure 14. 5V VOVP vs. Temperature 7.060 5 5 Temperature (°C) Figure 13. 5V VUVP vs. Temperature VUVP (V) 65 6.120 Temperature (°C) -40 -25 -10 50 Figure 12. 3.3V VOVP vs. Temperature VOVP (V) VUVP (V) Figure 11. 3.3V VUVP vs. Temperature 3.300 -40 -25 -10 35 Temperature (°C) SG6105A — Power Supply Supervisor+Regulator+PWM Typical Performance Characteristics (Continued) Figure 16. 12V VOVP vs. Temperature www.fairchildsemi.com 10 Protection against over-voltage, short-circuit, and fault conditions is mandatory in PC power supplies. These protection circuits can be realized by using many discrete components and comparators, which occupy a lot of PCB space and add to assembling costs. This single chip controller IC provides complete protection circuits, shunt regulators, and PWM control function with fewer components. SG6105A is an ideal controller IC for PC switching mode power supplies. Feature Descriptions 1. Over-voltage protection can be implemented without any additional components. Overvoltage sense levels for 3.3V, 5V, 12V, are 4.1V, 6.1V, 14.5V, respectively. 2. Over-current and/or short-circuit protection can also be achieved using over-power protection, in which the OPP pin is connected to the current transformer (driver transformer). 3. The power-good signal is asserted to indicate the 3.3V, 5V, and 12V is above the undervoltage threshold level. PG pin goes high when the above condition is reached. A 2K pull-up resistor may connect to 5V. 4. The VCC can be supplied from the 5V-standby. 5. When the VCC voltage is higher than 7V, besides the shunt regulator, the circuit is shutdown and reset. No extra power supply is needed. 6. Two internal high-precision 431 regulators are built-in to provide reference voltages. 7. Complete PWM control circuitry, including the error amplifier for push-pull or half-bridge operation. The features and benefits of this device are: 1. Over-voltage and under-voltage protection for 3.3V, 5V, and 12V without external divider. 2. Over-power protection. 3. UV protection for -12V and/or -5V. 4. Power-down warning for power-good signal. 5. Power-good signal and power-fail lockup. 6. Remote on/off control. 7. Delay time for PSON and PS-off signal. 8. Two shunt regulators for 3.3V and 5V-standby regulation. 9. Complete pulse width modulation (PWM) control circuitry. 10. On-chip oscillator. 11. Programmable soft-start. 12. Maximum 93% duty cycle. 13. Few external components. 14. More reliable system. 15. Little space on PCB. 16. Easy trouble-shooting and implementation. © 2008 Fairchild Semiconductor Corporation SG6105A • Rev. 1.0.2 shunt stable SG6105A — Power Supply Supervisor+Regulator+PWM Functional Description Supervisory Circuit Operation The PC generates the remote ON/OFF logic (PSON), which is LOW for power supply on and HIGH to switch off the power supply. The remote ON/OFF is connected to PSON input. www.fairchildsemi.com 11 Introduction The application guide shows the key features of SG6105A and illustrates how to design in an ATX switching mode power supply (SMPS). SG6105A is suitable for half-bridge, push-pull topology and incorporates with a four-channel supervisor, including 5V-standby. The PWM section of SG6105A comprises a built-in 65kHz oscillator and high-immunity circuits, which protect the system from noise interference and provide more noise margins for improper PCB layout. SG6105A has OVP and UVP for 12V, 5V, and 3.3V. NVP is used for negative voltage protection, such as – 12V and/or –5V. The UVAC (AC fails detection) is applied to detect AC line condition. Two built-in internal precision TL431 shunt regulators can be used for 3.3V or 5V auxiliary standby power. VDD OP2 R1 R2 C1 OPP R3 Figure 18. OPP Protection Circuit AC Fails Detection Through a resistor divider, UVAC is connected to the secondary power transformer for detecting the AC line condition. Once the voltage of UVAC is lower than 0.7V for a period of time, such as 200µs, the PG (powergood) signal is pulled low to indicate an AC line powerdown condition. The voltage amplitude of the PWM switching signal in the secondary power transformer is proportional to the AC line voltage. Adjust the ratio of resistor divider to decide the threshold of power-down warning. A small capacitor is connected from UVAC to ground for filtering the switching noise. VS Negative Voltage Protection (NVP) The NVP provides an under-voltage protection (UVP) for negative voltage outputs. An under-voltage represents the phenomenal of the overload condition in negative voltage output. For example, the –12V output may drop to –10V during the overload situation. A resistor determining the threshold of the protection is connected from pin NVP to the negative voltage output. Via this resistor, NVP outputs a 64µA constant current to the negative voltage output. When the NVP voltage is over 2.1V and the situation kept for longer than 7ms, SG6105A locks the power outputs off: VNVP=64µA × (R1 + R2) – V-12V VO SG6105A — Power Supply Supervisor+Regulator+PWM OP1 Application Information (1) The power outputs are locked off when VNVP ≥ 2.1V. R1 R2 0.7V UVAC C1 Figure 19. NVP Protection Circuit Figure 17. AC Detection Circuit Over-Power Protection (OPP) The OPP is used for detecting over-power and/or shortcircuit conditions. When OPPS voltage (p.4, Note-1) is higher than 2.1V and this situation exists for longer than 7ms, SG6105A pulls the PG low and locks off the power outputs. © 2008 Fairchild Semiconductor Corporation SG6105A • Rev. 1.0.2 www.fairchildsemi.com 12 VCC PSON 3.3V,5V,12V tPSON(ON) NVP tPSON(OFF) SS(on/off) PG tUVP tNVP tPSOFF tPG SG6105A — Power Supply Supervisor+Regulator+PWM Timing Diagram VCC PSON Voltage < VUVAC UVAC OPP tOPP SS(on/off) PG Figure 20. Timing Diagram © 2008 Fairchild Semiconductor Corporation SG6105A • Rev. 1.0.2 www.fairchildsemi.com 13 SG6105A — Power Supply Supervisor+Regulator+PWM Reference Circuit SG6105A Figure 21. Reference Circuit © 2008 Fairchild Semiconductor Corporation SG6105A • Rev. 1.0.2 www.fairchildsemi.com 14 Reference Component Reference Component D1,D2,D6 PR1004 R14 100KΩ 1% D3 2A45V R15 47KΩ 1/8W D4,D5 30C40 R16 9.47KΩ 1/8W D7,D8,D9,D10,D11 1N4148 R17 1.5KΩ 1% R1 62KΩ 1/8W R18 1.45KΩ 1% R2 3.2KΩ 1/8W R19 39Ω 1/8W R3 510Ω 1% R20 1KΩ 1/8W R4 1.5KΩ 1% R21 96.7KΩ 1/8W R5 100Ω 1/8W R22 10KΩ 1/8W R6 100Ω 1/8W C1 101/50V R7 1KΩ 1/8W C2,C5 2.2µF/50V R8 47~100Ω C3,C6 103/50V R9 1KΩ C4 333/50V R10 95.3KΩ Q1 A928 R11 93.7KΩ Q2,Q3 2SC945 R12 75 KΩ U1 PC817 R13 14.2KΩ U2 SG6105A © 2008 Fairchild Semiconductor Corporation SG6105A • Rev. 1.0.2 SG6105A — Power Supply Supervisor+Regulator+PWM BOM www.fairchildsemi.com 15 SG6105A — Power Supply Supervisor+Regulator+PWM Physical Dimensions 24.892-26.924 PIN #1 6.223-6.477 7.620 1.524 3.175-3.429 2.921-3.810 5.334 MAX 2.540 0-15 0.381 MIN 0.457 9.017 TYP NOTES: A. CONFORMS TO JEDEC REGISTRATION MS-001, VARIATIONS AD B. ALL DIMENSIONS ARE IN MILLIMETERS C. DOES NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.25MM. D. DOES NOT INCLUDE DAMBAR PROTRUSIONS. DAMBAR PROTRUSIONS SHALL NOT EXCEED 0.25MM. E. DRAWING FILE NAME: N20SREV1 Figure 22. 20-Lead Dual Inline Package (DIP) Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions, specifically the warranty therein, which covers Fairchild products. Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings: http://www.fairchildsemi.com/packaging/. © 2008 Fairchild Semiconductor Corporation SG6105A • Rev. 1.0.2 www.fairchildsemi.com 16 SG6105A — Power Supply Supervisor+Regulator+PWM © 2008 Fairchild Semiconductor Corporation SG6105A • Rev. 1.0.2 www.fairchildsemi.com 17