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2#
发表于 2019-10-19 11:17:16
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只看该作者
来自: 甘肃 来自 甘肃
Pin Description
1. Over Power Protection pin (OPP, pin 1): applying a negative voltage on this pin reduces the internal maximum peak current set point.
2. Over Temperature Protection pin (OTP, pin 2): Connect an NTC between this pin and ground. An internal current source biases the NTC. When the NTC pulls the pin down, the circuit permanently latches-off.
3. Timer pin (Timer, pin 3): Wiring a capacitor from this pin to ground helps selecting the timer duration.
4. Zero Voltage Detection pin (ZCD, pin 4): Connected to the auxiliary winding, this pin detects the core reset event.
5. Timing Capacitor pin (Ct, pin 5): A capacitor connected to this pin acts as the timing capacitor in VCO mode.
6. Feedback pin (FB, pin 6): Hooking an optocoupler collector to this pin will allow regulation.
7. Current Sense pin (CS, pin 7): This pin monitors the primary current and triggers the fault if needed.
8. Ground pin (GND, pin 8): The controller ground.
9. Driver pin (DRV, pin 9): This pin delivers pulses to the power MOSFET.
10. Power Supply pin (VCC, pin 10): This pin supplies the controller and accepts voltage up to 28 V.
11. Brown-Out pin (BO, pin 11): Allows shutting-down the controller for a chosen input voltage level. (C and D versions only)
12. Over Voltage Protection pin (OVP, pin 12): By pulling this pin high, the controller can be permanently latched-off.
13. High Voltage pin (HV, pin 14): Connected to the bulk capacitor, this pin powers the internal current source to deliver a start-up current that charges the VCC capacitor. |
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