APW7025 Ver la hoja de datos (PDF) - Anpec Electronics

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APW7025

Advanced PWM and Dual Linear Power Control

Anpec Electronics 

APW7025

Electrical Characteristics Cont.

Symbol

Parameter

Protection

VSEN1 Over-Voltage

(VSEN1/DACOUT)

IOVP

IOCSET

ISS

FAULT Souring Current

OCSET Current Source

Soft Start Current

Power Good

VSEN1 Upper Threshold

(VSEN1/DACOUT)

VSEN1 Under Voltage

(VSEN1/DACOUT)

VSEN1 Hysteresis (VSEN1

/DACOUT)

VPGOOD PGOOD Voltage Low

Test Conditions

APW7025

Unit

Min. Typ. Max.

VSEN1 Rising

VFAULT/RT=2.0V

VOCSET= 4.5VDC

115 120 %

8.5

mA

170 200 230 µA

28

µA

VSEN1 Rising

VSEN1 Rising

Upper /Lower Threshold

IPGOOD= -4mA

108

110 %

92

94

%

2

%

0.8

V

Functional Pin Description

VCC (Pin 1)

regulator (NVVDD) output voltage.

Provide a 12V bias supply for the IC to this pin. This

pin also provides the gate bias charge for all the

MOSFETs controlled by the IC. The voltage at this

pin is monitored for Power-On Reset (POR) purposes.

DRIVE2 (Pin 2)

Connect this pin to the gate of an external MOSFET.

This pin provides the drive for the NVVDD regulator’s

pass transistor.

PGOOD (Pin 8)

SS (Pin 10)

Connect a capacitor from this pin to ground. This

capacitor, along with an internal 28µA current source,

sets the soft-start interval of the converter.

FAULT (Pin 11)

This pin provides oscillator switching frequency

adjustment. By placing a resistor (RT) from this pin to

GND, the nominal 200kHz switching frequency is in-

creased according to the following equation:

PGOOD is an open collector output used to indicate

the status of the output voltages. This pin is pulled

low when the synchronous regulator output is not

within ±10% of the DACOUT reference voltage or

when any of the other outputs are below their under-

voltage thresholds.

VSEN2 (Pin 9)

Connect this pin to a resistor divider to set the linear

Fs

=200kHz

+

5

×

10

6

/

R

T

(kΩ)

(R to GND)

T

Conversely, connecting a resistor from this pin to VCC

reduces the switching frequency according to the fol-

lowing equation:

Fs =200kHz + 4 × 10 7 / RT (kΩ) (RT to 12V)

Nominally, the voltage at this pin is 1.26V. In the event

of an over-voltage or over-current condition, this pin

Copyright  ANPEC Electronics Corp.

4

Rev. P.1 - Mar., 2001

www.anpec.com.tw

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