MP3910 –PEAK CURRENT MODE BOOST CONTROLLER

MP3910 Rev. 1.11

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5

11/6/2014

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PIN FUNCTIONS

Pin #

Name

Description

1

GND

Power ground pin which is gate driver return.

2

RT

Switching frequency set pin. Connect a resistor from this pin to GND to set the

switching frequency (30kHz~400kHz).

3

COMP

Feedback pin for isolated solution. Error amplifier output pin for un-isolated solution.

4

FB

Feedback and OVP monitor pin with respective internal reference voltage for un-

isolated solution. OVP monitor pin for isolated solution. Connected to GND if not used

in isolated solution.

5

EN/SYNC

On/off control Input. Internally connected to GND with 1MΩ resistor. Apply an external

clock higher than RT set frequency to the EN pin can synchronize the switching

frequency.

6

SS

Soft-start pin. Connect one capacitor between this pin and GND to control the duration

of COMP voltage rising. It determines both the soft-start current, and hiccup protection

delay.

7

ISENSE

Current Sense and application mode (isolated/un-isolated) setting pin. At start-up, this

pin will output one current signal and sense the voltage for mode setting detection.

During normal operation, this pin will sense the voltage across sense resistor for

current mode control, as well as cycle-by-cycle current limit, over load and short circuit

protection.

8

VIN

Input supply. Connect a bypass capacitor from this pin to GND

9

VCC

Internal 12V regulator output. Connect a capacitor between this pin to GND to bypass

the internal regulator.

10

GATE

This pin drives the external N-channel power MOSFET device.