AP3039FN-G1 查看數據表（PDF） - BCD Semiconductor

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AP3039FN-G1

BOOST CONTROLLER

BCD Semiconductor 

Data Sheet

BOOST CONTROLLER

AP3039

Application Information (Continued)

Soft Start

AP3039 has a soft start circuit to limit the inrush

current during startup. The time of soft start is

controlled by an internal 12µA current source and an

external soft start capacitor CSS connected from SS pin

to GND (see Figure 20). The effective CSS voltage for

Soft Start is from 0 to 2.3V, the time of Soft Start is:

VCC Pin Application Description

The AP3039 includes an internal low dropout linear

regulator with the output pin VCC. This pin is used to

power internal PWM controller, control logic and

MOSFET driver. On the condition that VIN≥8.5V, the

regulator generates a 6V supply. If 6V≤VIN≤8.5V, the

VCC is equal to VIN minus drop voltage across bypass

switch. When VIN is less than 6V, connect VCC to

VIN.

tSS = CSS*2.3V/12µA

Typical Application

VIN : 6V to 27V

L

D1

CIN

R1

R2

CV

OFF ON

RT

CSS

RC

CC

VIN

UVLO

OUT

Q1

VCC

EN

CS

RCS

RT

OV

SS

FB

COMP

SHDN

GND

OFF ON

U1 AP3039

VOUT

COUT

R3

R5

R4

R6

Figure 20. Application Circuit 1 of AP3039 (Note 2)

Dec. 2009 Rev. 1. 4

BCD Semiconductor Manufacturing Limited

14

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