designs for power-supply regulator. All the functions
included an on-chip 0.77V reference output, an
error amplifier, an adjusted oscillator, a soft-start,
UVLO, SCP circuitry, and a push-pull output circuit.
Switching frequency can be adjustable by trimming
CT. During low VCC situation, the UVLO makes
sure that the outputs are off until the internal circuit
is operational normally.
Applications
- Backlight inverter
- LCD Monitor
- XDROM, XDSL Product
- DC/DC converters in computers, etc.
Pin Assignment
( Top View )
OUT
VCC
COMP
FB
1
2
3
4
8
7
6
5
Pin Descriptions
Name
GND
CT
SS
SCP
Description
Timing Capacitor
Voltage Feedback
Soft-Start.
Feedback Loop Compensation
PWM Output
Ground
Supply Voltage
Short Circuit Protection
CT
FB
SS
COMP
OUT
GND
VCC
SCP
PDIP/SOP
Ordering Information
AP2008 X
Package
N: PDIP-8L
S: SOP-8L
X
X
Lead Free
Packing
Blank : Tube
Blank : Normal
L : Lead Free Package A : Taping
This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of
this product. No rights under any patent accompany the sale of the product.
Rev. 1.0 Oct 11, 2004
1/8
AP2008
PWM Buck Controller
Block Diagram
VCC
SS
CT
10K-300KHz / CT value
0.77V
Bandgap
Reference
2.5V
Internal use
UVLO
Oscillator
VCC
Iss
PWM Amplifier
FB
+
+
-
Error Amplifier
COMP
-
1.5V
+
0.7V
-
+
OUT
SCP
GND
Absolute Maximum Ratings
Symbol
V
CC
V
I
V
O
I
SOURCE
I
SINK
T
OP
T
ST
T
LEAD
Supply voltage
Amplifier input voltage
Collector output voltage
Source current
Sink current
Operating temperature range
Storage temperature range
Lead temperature 1.6 mm(1/16 inch) from case for 10 seconds