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HV9912 Datasheet(PDF) 7 Page - Microchip Technology |
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HV9912 Datasheet(HTML) 7 Page - Microchip Technology |
7 / 20 page 2016 Microchip Technology Inc. DS20005583A-page 7 HV9912 2.0 PIN DESCRIPTION Table 2-1 shows the pin description details of HV9912. TABLE 2-1: PIN DESCRIPTION TABLE Pin Number Name Description 1 VIN This pin is the input of a 90V high-voltage regulator. 2 VDD This is a power supply pin for all internal circuits. It must be bypassed with a low-ESR capacitor to GND (at least 0.1 µF). 3 GATE This pin is the output gate driver for an external N-channel power MOSFET. 4 GND This is the ground return for all the low-power analog internal circuitry. This pin must be connected to the return path from the input. 5 CS This pin is used to sense the source current of the external power FET. It includes a built-in 100 ns (minimum) blanking time. 6 SC This pin is used to set the slope compensation. 7 RT This pin sets the frequency of the power circuit. A resistor between RT and GND will program the circuit in Constant Frequency mode. 8 SYNC This I/O pin may be connected to the SYNC pin of other HV9912 circuits and will cause the oscillators to lock to the highest frequency oscillator. 9 CLIM This pin provides a programmable input current limit for the converter. The current limit can be set using a resistor divider from the REF pin. 10 REF This pin provides 2% accurate reference voltage. It must be bypassed with a 0.01 μF–0.1 μF capacitor to GND. 11 FAULT This pin is pulled to ground when there is an Output Short-circuit condition or Output Overvoltage condition. This pin can be used to drive an external MOSFET (in the case of boost converters) to disconnect the load from the source. 12 OVP This pin provides the overvoltage protection for the converter. When the voltage at this pin exceeds 5V, the GATE output of the HV9912 is turned off, and the FAULT goes low. The IC will turn on when the voltage at the pin goes below 4.5V. 13 PWMD When this pin is pulled to GND (or left open), switching of the HV9912 is disabled. When an external TTL high level is applied to it, switching will resume. 14 COMP Stable Closed-loop control can be accomplished by connecting a compensation net- work between COMP and GND. This capacitor also controls the hiccup time. 15 IREF The voltage at this pin sets the output current level. The current reference can be set using a resistor divider from the REF pin. 16 FDBK This pin provides output current feedback to the HV9912 by using a current sense resistor. |
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