APW7062B データシートの表示（PDF） - Anpec Electronics

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APW7062B

Synchronous Buck PWM Controller

Anpec Electronics 

APW7062B

Functional Pin Description (Cont.)

Where :

t1=1.2V

CSS = Soft Start Capacitor

ISS = Soft Start Current = 10µA

VOSC(MIN) = Bottom of Oscillator = 1.35V

VIN = Input Voltage

∆Vosc = Peak to Peak Oscillator Voltage = 1.9V

∆VOUTSteadyState = Steady State Output Voltage

COMP (Pin4)

This pin is the output of the error amplifier. Add an

external resistor and capacitor network to provide the

loop compensation for the PWM converter (see Appli-

cation Information).

LGATE pins are held low. The EN pin is the open-

collector, it will not be floating.

GND (Pin7)

Signal ground for the IC.

PHASE (Pin8)

This pin is connected to the source of the high-side

MOSFET and is used to monitor the voltage drop across

the high-side MOSFET for over-current protection.

UGATE (Pin9)

Connect the pin to external MOSFET, and provides

the gate drive for the upper MOSFET.

FB (Pin5)

FB pin is the inverter input of the error amplifier. and it

receives the feedback voltage from an external resis-

tive divider across the output (VOUT). The output volt-

age is determined by:

BOOT (Pin 10)

This pin provides the supply voltage to the high side

MOSFET driver. For driving logic level N-channel

MOSEFT, a bootstrap circuit can be used to create a

suitable driver’s supply.

VOUT

=

0.8V

×

1+

ROUT

RGND



where ROUT is the resistor connected from VOUT to FB

and RGND is the resistor connected from FB to GND.

If the FB voltage is under 50% VREF, because of the

short circuit or other influence , it will cause the under

voltage protection, and the device is shutdowned. Re-

move the error condition and restart the VCC voltage

or pull the EN from low to high once, the device can

be enabled again.

PGND (Pin11)

Power ground for the gate diver. Connect the lower

MOSFET source to this pin.

LGATE (Pin 12)

Connect the pin to external MOSFET, and provides

the gate drive signal for the lower MOSFET.

PVCC (Pin13)

This pin provides a supply voltage for the lower gate

drive, connect it to VCC pin in common use.

EN (Pin6)

Pull the pin higher than 2V to enable the device, and

pull the pin lower than 0.8V to shutdown the device. In

shutdown, the SS is discharged and the UGATE and

VCC (Pin14)

This pin provides a supply voltage for the device, when

VCC is above the rising threshold 10.4V, the device is

turned on, conversely, VCC is below the falling

threshold, the device is turned off.

Copyright  ANPEC Electronics Corp.

6

Rev. A.3 - Mar., 2005

www.anpec.com.tw

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