FAN7687 Fairchild Semiconductor, FAN7687 Datasheet
FAN7687
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FAN7687 Summary of contents
Page 1
... It directly senses all the output rails for OVP, UVP, and OCP without external divider resistors. As for output control, power good output(PGO) and fault protection output(FPO) are included. The FAN7685/FAN7686/FAN7687 offers a simple and cost effective solution with minimum number of external components and greatly reduces PCB board space for power supply ...
Page 2
... R H PGO 14 GND Short H Detector Delay H when AC ON clr 300ms FAN7685 CLK (FAN7686 FPO L FPO Vcc 150uA 3. Debounce 4 PSON 38ms CLK R H PGO 14 GND Short H Detector H Delay when AC ON clr 300ms CLK FAN7687 FAN7687A ...
Page 3
... IS5* ISVCC12** IS5 8 IS33* IS33 9 VS12* VS12 10 NC* 11 VS33 12 VS5 Vcc 13 VCC12** 14 PGO Notes : * : FAN7686 Pin Definitions ** : FAN7687/FAN7687A Pin Definitions PGO PGI 1 V GND 2 CC VS5 FPO 3 VS33 PSON 4 VS12 IS12 5 IS33 RI 6 IS5 IS5 7 I/O I Power Good Input ...
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... FAN7685/FAN7686/FAN7687 Absolute Maximum Ratings Parameter Supply Voltage Input Voltage Output Voltage Operating Temperature Storage Temperature Power Dissipation *Note : Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. Recommended Operating Conditions Characteristic Supply Voltage Input Voltage Output Voltage ...
Page 5
... These parameters although guaranteed over the recommended operating conditions, are not 100% tested in production 5V, Ta=25°C, unless otherwise specified) CC Test Condition VS33 FAN7687A VS5 FAN7687A VS12, (VS12) FAN7687A VCC12 (VCC12) FAN7687A VS33 FAN7687A VS5 FAN7687A VS12, (VS12) FAN7687A VCC12 (VCC12) FAN7687A Resistor at RI=30kΩ, Iref 0.1% Resistor V V =0V offset PSON LKGI FPO I =10mA FPO V ...
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... FAN7685/FAN7686/FAN7687 Timing Chart 1) AC Input ON/OFF - Normal State V CC POR PSON FPO PGI OUT PGO 2) PSON ON/OFF - Normal State PSON FPO PGI OUT PGO 6 AC Input Enable t b1 UVP Threshold Input Disable UVP Threshold ...
Page 7
... Under Voltage at Normal State PSON FPO PGI OUT PGO 4) Under Voltage at AC Input POR PSON FPO PGI OUT PGO Latch UVP Threshold AC Input Enable Latch PGI Threshold FAN7685/FAN7686/FAN7687 b1 UVP Threshold UVP Threshold ...
Page 8
... FAN7685/FAN7686/FAN7687 5) Under Voltage at PSON ON/OFF PSON t FPO d3 PGI OUT PGO 6) Over Voltage at PSON ON/OFF PSON FPO PGI OUT PGO 8 Latch PGI Threshold b2 Latch OVP Threshold UVP Threshold UVP Threshold ...
Page 9
... Typical Application Circuits FAN7685 Application Circuit PWM 5Vsb PSON FAN7687 Application Circuit PWM 5Vsb PSON IS12 R R S_12V IS12 IS12 5V Coil R R S_5V IS5 IS5 3.3V Coil R R S_3.3V IS33 IS33 PGO 1 14 PGI PGO 5Vsb 2 GND VS5 3 FPO VS5 12 VS33 ...
Page 10
... Furthermore, motherboards should be designed to comply with the above recommended timing range. If timings other than these are implemented or required, that information should be clearly specified. The FAN7685/FAN7686/FAN7687 provide a power good(PGO) signal for the +3.3V, +5V and +12V supply voltage rails and a separate power good input(PGI). An internal delay circuit is used to generate a 300ms power good delay. ...
Page 11
... When it happens before the power supply turns on, this is called a short-circuit power supply turn-on. It can happen during the design period, in the production line, at quality control inspection or at the end user. The FAN7685/FAN7686/FAN7687 provide an UVP and OCP with a 75ms delay after PSON is set low. ...
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... FAN7685/FAN7686/FAN7687 Mechanical Dimensions Package 12 Dimensions in millimeters/inches 14-DIP ...
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... Mechanical Dimensions Package Dimensions in millimeters/inches 14-SOP FAN7685/FAN7686/FAN7687 13 ...
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... FAN7686M FAN7687M FAN7687AM FAN7685MX FAN7686MX FAN7687MX FAN7687AMX DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS ...