CP494
SWITCHMODE Pulse Width Modulation Control Circuit
The CP494 is a fixed frequency, pulse width modulation control
circuit designed primarily for SWITCHMODE power supply control.
PIN CONNECTIONS
•
•
•
•
•
•
•
•
Complete Pulse Width Modulation Control Circuitry
On–Chip Oscillator with Master or Slave Operation
On–Chip Error Amplifiers
On–Chip 5.0 V Reference
Adjustable Deadtime Control
Uncommitted Output Transistors Rated to 500 mA Source or Sink
Output Control for Push–Pull or Single–Ended Operation
Undervoltage Lockout
Noninv
Input 1
Inv
Input 2
Compen/PWN
Comp Input 3
Deadtime
Control 4
C
T
5
R
T
6
Ground 7
C1 8
+
Error 1
Amp
-
V
CC
+
2 Error
Amp
-
5.0 V
REF
Noninv
16 Input
Inv
15 Input
14 V
ref
Output
13 Contro
l
12 V
CC
≈
0.1 V
Oscillator
Q2
11 C2
10 E2
MAXIMUM RATINGS
(Full operating ambient temperature range applies,
unless otherwise noted.)
Rating
Power Supply Voltage
Collector Output Voltage
Collector Output Current
(Each transistor) (Note 1)
Amplifier Input Voltage Range
Power Dissipation @ T
A
≤
45°C
Thermal Resistance,
Junction–to–Ambient
Operating Junction Temperature
Storage Temperature Range
Operating Ambient Temperature Range
Symbol
V
CC
V
C1
,
V
C2
I
C1
, I
C2
V
IR
P
D
R
qJA
T
J
T
stg
T
A
Value
42
42
500
–0.3 to +42
1000
80
125
–55 to +125
0 to +70
Unit
V
V
mA
V
mW
°C/W
°C
°C
°C
Q1
9 E1
(Top View)
Derating Ambient Temperature
1. Maximum thermal limits must be observed.
T
A
45
°C
* All specs and applications shown above subject to change without prior notice.
1F-5 NO.66 SEC.2 NAN-KAN RD ., LUCHU , TAOYUAN, TAIWAN
Email: server@ceramate.com.tw
Tel:886-3-3214525
Http: www.ceramate.com.tw
Page 1 of 11
Rev 1.0 Apr.19,2004
Fax:886-3-3521052
CERAMATE [ CERAMATE TECHNICAL ]
