SG6105D1 DESCRIPTION APPLICATIONS. ATX NLX SFX (micro-atx) Product Specification. Power Supply Supervisor + Regulator + PWM

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1 Power Supply Supervisor Regulator PWM SG605D FEATURES PC half-bridge (or 9) power supply supervisor two PWM High integration & few external components Over-voltage protection for.v, 5V and V Under-voltage protection for.v, 5V and V Under-voltage protection for V and/or 5V Over-power and short-circuit protection Power-down warning circuitry Power good circuitry Delay time for PSON and signal Remote ON/OFF function On-chip oscillator and error amplifier Two shunt regulator for.v and 5V-Standby Latching PWM for cycle-by-cycle switching Push-pull PWM operation and totem pole outputs Soft-start and maximum 9% duty cycle APPLICATIONS as: Switching mode power supply for Computers, such DESCRIPTION SG605D controller is designed for switching mode power supply 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, some protection features against over-voltage and over-power are implemented. It directly senses all the output rails for OVP without the need of external dividers. An innovated AC-signal sampling circuitry provides a sufficient power-down warning signal for. A built-in timer generates accuracy timing for control circuit including the PS-off delay. The cycle-by-cycle PWM switching prevents the power transformer from the saturation and ensures the fastest response for the short-circuit protection which greatly reduce the stress for power transistors. Two internal precision TL shunt regulators provide stable reference voltage and driver for.v and 5V-standby regulation. Utilizing minimum number of external components, the SG605D includes all of the functions for push-pull and/or half-bridge topology, decreasing the production cost and PCB space, and increasing the MTBF for power supply. ATX NLX SFX (micro-atx) MARKING DIAGRAMS PIN CONFIGURATION 0 PSON 0 VCC SG605TP V 9 RI XXXXXXXYYWWV V5 8 SS 7 IN 5 6 COMP NVP 6 5 GND T: D = DIP P : Z = Lead Free Null=regular package XXXXXXX: Wafer Lot YY: Year; WW: Week V: Assembly Location V OP OP FB VREF VREF FB System General Corp Version.0(IRO.00.B) May, 00

2 Power Supply Supervisor Regulator PWM SG605D ORDERING INFORMATION Part Number Package SG605D SG605DZ 0-Pin DIP 0-Pin DIP(Lead Free) PIN DESCRIPTIONS Name Pin Type Function VCC 0 Supply Supply voltage..5v ~ 5.5V. It is connected to 5V-standby. 0 Logic output Power Good logic output, 0 or (open-collector). = means that the power is good for operation. The delay is 00 msec. V Analog input.v over-voltage/under-voltage control sense input. V5 Analog input 5V over-voltage/under-voltage control sense input. V 7 Analog input V over-voltage/under-voltage control sense input. Analog input 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. PSON Logic input Remote On/Off logic input for CPU or controller. Turn on/off the PWM Output after the 7.5 msec / 6 msec delay. PSON = 0 means that the main SMPS is operational. PSON = means that the main SMPS is off and the latch is reset. NVP 6 Analog input The protection input for negative output, such as V and/or 5V. Trip voltage =.V. 5 Analog input AC fail detection, detect main AC voltage under-voltage and/or failure. COMP 6 Analog output Error amplifier output and the input of the PWM comparator. IN 7 Analog input The negative input of error amplifier. The positive input of error amplifier is a.5v reference voltage. SS 8 Analog input The soft-start. It is settable through external capacitor. The current source output at this pin is 8uA and the voltage is clamped at.5v. OP/OP 9/8 Analog output The totem-pole output drivers of push-pull PWM. The output are enabled (low) only when the NAND gate inputs are high, the maximum duty cycle on an output (OP or OP) is 6%. FB Analog output Output for first converter regulation loop. VREF Analog input Reference comparison input for first converter regulation loop..5v. FB Analog output Output for second converter regulation loop. VREF Analog input Reference comparison input for second converter regulation loop..5v. Program. Connected to external resistor for the reference setting. RI 9 Analog input RI = 75k ohms. GND 5 Supply Ground. System General Corp Version.0(IRO.00.B) May, 00

3 Power Supply Supervisor Regulator PWM SG605D BLOCK DIAGRAM V V5 V RI GND VCC DSD UV Detector _ COMP 0.7V ua Vref FB VREF OV Protector Delay 00msec FB UV Protector Delay sec VREF 5V.V _ COMP 6uA.V _ COMP NVP 6 Buffer Buffer.V _ COMP Delay 7msec Delay 7msec Vcc D Q CK R.5V 8uA _ COMP D Q CK _ Q 9 OP Vcc Delay 5msec _ Error Amp O.S.C.V _ COMP PSON On/Off Delay 6msec 7.5msec Delay msec S R Q 8 OP 8 SS 7 IN 6 COMP System General Corp Version.0(IRO.00.B) May, 00

4 Power Supply Supervisor Regulator PWM SG605D TIMING DIAGRAM VCC PSON.V,5V,V NVP t pson(on) t pson(off) t uvp t nvp SS(on/off) t psoff t VCC PSON Voltage < V t SS(on/off) System General Corp Version.0(IRO.00.B) May, 00

5 Power Supply Supervisor Regulator PWM SG605D ABSOLUTE MAXIMUM RATINGS Symbol Parameter Value Unit V CC DC Supply Voltage at Pin 0 6 V V FB Shunt Regulator Output at Fb, Fb Pins 6 V I OUT Output Current at, Fb, Fb Pins 0 ma P D,5 Power Dissipation (T A=5 ).5 W P D,90 Power Dissipation (T A=90 ) 0.5 W T STG Storage Temperature Range -55 to 50 R θja Thermal Resistance, Junction-To-Air 8.5 /W T J,MAX Operating Junction Temperature 50 T A,MAX Operating Ambient Temperature -0 to 5 T L Lead Temperature (Soldering, 0sec) 60 ESD Capability, HBM model.0 kv Note: All voltage values, except differential voltage, are with respect to network ground terminal. RECOMMENDED OPERATING CONDITIONS Symbol Parameter Value Unit V CC DC Supply Voltage at Pin 0.5 to 5.5 V V FB Shunt Regulator Output at Fb, Fb Pins to 6 V T OPER Operating Ambient Temperature Range -5 to 85 ELECTRICAL CHARACTERISTICS (V CC = 5V, T A = 5 C) I CC Total Supply Current High ma V OVP Over-Voltage Protection.V V V OVP Over-Voltage Protection 5V V V OVP Over-Voltage Protection V V V UVP Under-Voltage Protection.V V V UVP Under-Voltage Protection 5V V V UVP Under-Voltage Protection V V V UVS Under-Voltage Sense.V for Low V V UVS Under-Voltage Sense 5V for Low V V UVS Under-Voltage Sense V for Low V V S* Over-Power Protection. V =.5V V V NVP Negative Voltage Protection: Voltage Level V I NVP Negative Voltage Protection: Source Current RI = 75kΩ ua t OVP Timing for Over-Voltage Protection RI = 75kΩ us t UVP Timing for Under-Voltage Protection RI = 75kΩ ms t UVS Timing for Under-Voltage Sense for Low RI = 75kΩ ms t Timing for Over-Power-Protection RI = 75kΩ. 7. ms t NVP Timing for Negative Voltage Protection RI = 75kΩ ms Note * : V S = (/) x V (/) x V ; System General Corp Version.0(IRO.00.B) May, 00

6 Power Supply Supervisor Regulator PWM SG605D Shunt Regulator (FB, VREF, FB, VREF) V REF Reference Voltage I FB = 0.5mA, T A = V V DEV, I * Deviation of V REF Over Load Current I FB = 0.5mA to 0mA mv V DEV, T * Deviation of V REF Over Temperature T A = -5 to mv R egli-fb * I out-fb * Line Regulation < V FB < 6V - - mv/v Output Sinking Current Capability V FB > V ma Note * : Not tested in production test. Power Good Section t pg Timing for Delay RI = 75kΩ ms V uvac Voltage Sense for V t R * t F * Good Output Rising Time C L = 00pF - - us Good Falling Time C L = 00pF ns V ol Power Good Output Saturation Level I = 5mA V I on Power Good Leakage Current Collector V = 5V - - ua Remote On/Off V pson PSON Input Threshold Level -..0 V I pson Remote Input Driving Current ma t pson(on) Timing PSON to On/Off On RI = 75kΩ ms t pson(off) Off (PS-off) t psoff Timing low to Power Off RI = 75kΩ.5 6. ms Error Amplifier V.5 Reference Voltage V I IB * Input Bias Current ua A VOL * Open-Loop Voltage Gain db BW * Unity Gain Bandwidth MHz PSRR * Power Supply Rejection Ratio db Oscillator Section F osc PWM Frequency RI = 75kΩ KHz Soft-Start Section I ss Charge Current RI = 75kΩ ua System General Corp Version.0(IRO.00.B) May, 00

7 Power Supply Supervisor Regulator PWM SG605D Comparator Section DC Duty Cycle % PWM Output Section (OP, OP) V ol Output Voltage Low Io = 5mA V V oh Output Voltage High V = V - - V R O Output Impedance of V OH kω System General Corp Version.0(IRO.00.B) May, 00

8 Power Supply Supervisor Regulator PWM SG605D APPLICATION MAIN Transformer -V V 5V.V V.V V5 V STBY Transformer 5Vsb VCC VREF FB VREF FB OP SG605D SG606 PSON NVP RI Kohm 7~00ohm 5Vsb Pok PSon -V -5V GND 5V Vdd IN V COMP OP SS System General Corp Version.0(IRO.00.B) May, 00

9 Product Specification Power Supply Supervisor Regulator PWM SG605D APPLICATION CN C5 R65 C78 R66 C U5 D R69 Q D 0 T7 E6-D D 6 0 D C9 R7 T6 9 D5 R75 C6 D8 R7 R78 C5 R8 L Q6 VZ VZ R87 5VSB T8 C60 C69 R89 R0.V D5 C6 5V -5V -V D R9 R96 V OP C6 R9 FB VREF R9 C6 R9 R97 VR R95 R98 C65 C66 D D OP R00 Q7 FB R0 Q9 C67 C70 L7 L6 C7 VREF C7 R5 R0 R05 R06 R09 V 5V VI GND U7 LM7905 VO R6 R6 C9 R U RI NC FB GND SG688 D6 D7 OP Q D8 L C0 R6 F L SEN NC VDDGate R68 R67 R7 HHV D9 Q D0 C T5 R70 C8 OP C50 C7 BD TR D7 R77 R76 C5 R79 R80 C5 C5 FB C55 R8 R86 VREF C56 R8 R8 R85 Q5 C57 D9 D0 HHV C58 C59 R88 D 0 V5 R0 PSON U6 PSON V VCC RI 0 9 R90 D6 8 V5 SS 7 IN 5 6 COMP 6 5 NVP GND 7 V FB 8 OP VREF 5V V L C6 R99 9 OP VREF VREF Q8 0 FB SG605D D7 D8 R0 C L5 V5 FB L8 R07 C79 R Q0 C7 L9 C7 -V R L0 C75 R C76 R6.VSENCE.V C77-5V System General Corp Version.0(IRO.00.B) May, 00

10 Power Supply Supervisor Regulator PWM Example of Using SG605D for the ATX Power Supply 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 also add to assembling costs. This single chip controller IC provides complete protection circuits, shunt regulators, and PWM control function and with less number of components. SG605D is an ideal controller IC for PC switching mode power supplies. The features and benefits of this device are listed below: Over-voltage and under-voltage protection for.v, 5V and V without external divider Over-power protection. UV protection for V and/or 5V. Power-down warning for power good signal. Power good signal and power-fail lockup Remote on/off control. Delay time for PSON and PS-off signal. Two shunt regulator for.v and 5V-Standby regulation. Complete pulse width modulation (PWM) control circuitry. On-chip oscillator. Programmable Soft-Start. Maximum 9% duty cycle Few external components More reliable system Little space on PCB Easy trouble-shooting and implementation FEATURE DESCRIPTIONS Over voltage protection can be implemented without any additional components. Over-voltage sense Levels or.v, 5V, V are.v, 6.V,.5V respectively. Over current and/or short circuit protection can also be achieved by using over-power protection, in which pin is connected to the current transformer (driver transformer). The power good signal is asserted to indicate the.v, 5V and V is above the under voltage threshold level. pin goes high when the above SG605D condition is reached. A K pull up resistor may connect to 5V. The VCC can be supplied from the 5V-standby. When the VCC voltage is higher than 7V, besides the shunt regulator, the circuit of SG605D will be shutdown and reset. No extra power supply is needed. Two internal high precision shunt regulators are built-in. It provides stable reference voltages. Complete PWM control circuitry including the error amplifier for push-pull or half-bridge operation. 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. APPLICATION GUIDES Introduction The application guide shows the key-feature of SG605D and illustrates how to use in an ATX switching mode power supply (SMPS). SG605D is suitable for half-bridge, push-pull topology. It incorporates with a -channel supervisor, including 5V-standby. The PWM section of SG605D 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. SG605D has OVP and UVP for V, 5V and.v. Besides, the NVP is used for negative voltage protection, such as V and/or 5V. The (AC fails detection) is applied to detect AC line condition. Two built-in internal precision TL shunt regulators can be used for.v or 5V auxiliary standby power. AC Fails Detection Through a resistor divider, is connected to the secondary power transformer for detecting the AC line condition. Once the voltage of is lower than 0.7V for a period of time, such as 00usec, the (power good) signal will be pulled low to indicate an AC line power-down condition. The voltage amplitude of the System General Corp Version.0(IRO.00.B) May, 00

11 Power Supply Supervisor Regulator PWM 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 to ground for filtering the switching noise. Vin R R VS C 0.7V Vo Negative Voltage Protection SG605D The NVP provides an UVP (under voltage protection) for negative voltage outputs. An under-voltage represents the phenomenal of the overload condition in negative voltage output. For example, the V output may drop to 0V 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 6uA constant current to the negative voltage output. When the NVP voltage is over.v and the situation kept for longer than 7 msec, 605D will lock the power outputs off. VNVP = 6 ua (R R) V-V Over Power Protection () The (over power protection) is used for detecting over power and/or short-circuit conditions. When S voltage (p., Note-) is higher than.v and this situation existed for longer than 7 msec, 605D will pull the low and lock off the power outputs. The power outputs will be locked off when VNVP.V. 6uA R R -V OP.V -5V Vdd R C R R OP System General Corp Version.0(IRO.00.B) May, 00

12 Power Supply Supervisor Regulator PWM SG605D MECHANICAL DIMENSIONS 0 PINS DIP (D) D 0 θ E E eb 0 L e A A b b A Dimension Symbol Millimeter Inch Min. Typ. Max. Min. Typ. Max. A A A b b D E E e L e B θ System General Corp Version.0(IRO.00.B) May, 00

13 Power Supply Supervisor Regulator PWM SG605D 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 failure of the 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.0(IRO.00.B) May, 00