ANP015 Datasheet, PDF (2/15 Pages) List of Unclassifed Manufacturers – Application Note AP2011 High Efficiency Synchronous PWM Controller

Application Note
AP2011 High Efficiency Synchronous PWM Controller
ANP015
Preliminary
1. AP2011 Specification
1.1 Features
- Single 10V to 40V Supply Application
- 1.25V + 2.0% Voltage Reference.
- Virtual Frequency Control^TM.
- Fast transient response.
- Synchronous operation for high efficiency
- Current limit function.
- Small size with minimum external components
- Soft Start and Shutdown functions
- Industrial temperature range
- Under Voltage Lockout function
- SOP-14L Pb-Free package
1.2 General Description
The AP2011 integrates Pulse-width-Modulation (PWM) control circuit into a single chip, mainly designs
for power-supply regulator. All the functions included an on-chip 1.25V reference voltage, a smart auto
modulated oscillator, UVLO, SCP, circuitry, and synchronous PWM controller circuit. Recommend the output
CE transistors as pre-driver for Driving externally. Switching frequency can be adjustable by Virtual
Frequency Control. 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)
PGATE ¹
14 _VREF
VCC ²
13 _PHASE
PVCC ³
12 _SGND
PDRV ^{4 AP2011 11} OCSET
PGND ⁵
10 FB
NGATE ⁶
9 _SS/SHDN
VIN ⁷
8 _CAP
SOP-14L
1.4 Pin Descriptions
Pin Name No.
Description
PGATE
1 Level shift-gate driver
VCC
2 Internal regulator voltage
PVCC
3 Power VCC
PDRV
4 PMOS Gat driver
PGND
5 Power Ground
NGATE
6
Low side driver output (N
MOSFET)
VIN
7 Chip supply voltage
CAP
8 Charge pump pin
SS/ SHDN
Soft start, a capacitor to
9
ground sets the slow start
time/set low for shutdown
function.
FB
10 Feedback input
OCSET
11
Sets the converter
over-current trip point
SGND
12 Signal Ground
PHASE
13
Input from the phase node
between the MOSFETs
VREF
14 Reference voltage
Anachip Corp.
www.anachip.com.tw
Rev. A.0 Oct, 29, 2004
2/15