ANP007 Datasheet, PDF (2/11 Pages) Anachip Corp – Dual Buck Converter

Application Note
AP2001 Dual Buck Converter
1. AP2001 Specification
1.1 Features
- Dual PWM Control Circuitry
- Operating voltage can be up to 50V
- Adjustable Dead Time Control (DTC)
- Under voltage Lockout (UVLO) Protection
- Short Circuit Protection (SCP)
- Variable Oscillator Frequency...... 500Khz Max
- 2.5V voltage reference Output
- 16-pin PDIP and SOP packages
ANP007
1.2 General Description
The AP2001 integrates Pulse-width-Modulation (PWM) control circuit into a single chip, mainly designs for
power-supply regulator. All the functions included an on-chip 2.5V reference output, two error amplifiers, an
adjustable oscillator, two dead-time comparators, UVLO, SCP, DTC circuitry, and dual common-emitter (CE)
output transistor circuit. Recommend the output CE transistors as pre-driver for Driving externally. The DTC
can provide from 0% to 100%. Switching frequency can be adjustable by trimming RT and CT. During low
VCC situation, the UVLO makes sure that the outputs are off until the internal circuit is operational normally.
1.3 Pin Assignments
( Top View )
CT 1
RT ²
EA1+ 3
EA1- 4
FB1 5
DTC1 ⁶
OUT1 7
GND 8
16 REF
15 SCP
14 EA2+
13 EA2-
12 FB2
11 DTC2
10 OUT2
9 VCC
PDIP/SOP
1.4 Pin Descriptions
Name
Description
CT
Timing Capacitor
RT
Timing Resistor
EA+
Error Amplifier Input(+)
EA -
Error Amplifier Input(-)
FB
Feedback Loop Compensation
DTC
Dead Time Control
OUT
Pre-driver Output
GND
Ground
VCC
Supply Voltage
SCP
REF
Short Circuit Protection
Voltage Reference
Anachip Corp.
www.anachip.com.tw
Rev. A.0 Feb. 20, 2003
2/11