CP494 Datasheet, PDF (1/11 Pages) Ceramate Technical – SWITCHMODE Pulse Width Modulation Control Circuit

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.
• 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
MAXIMUM RATINGS (Full operating ambient temperature range applies,
unless otherwise noted.)
Rating
Symbol
Value
Unit
Power Supply Voltage
Collector Output Voltage
Collector Output Current
(Each transistor) (Note 1)
V_CC
42
V
V_C1,
42
V
V_C2
I_C1, I_C2
500
mA
Amplifier Input Voltage Range
Power Dissipation @ T_A ≤ 45°C
Thermal Resistance,
Junction–to–Ambient
V_IR
P_D
R_qJA
–0.3 to +42
1000
80
V
mW
°C/W
Operating Junction Temperature
T_J
Storage Temperature Range
T_stg
Operating Ambient Temperature Range
T_A
125
°C
–55 to +125 °C
0 to +70
°C
PIN CONNECTIONS
Noninv
Input
1
Inv
Input
2
Compen/PWN
Comp Input
3
Deadtime
Control
4
C_T 5
R_T 6
Ground 7
+
Error
-Amp
1
≈ 0.1 V
+
2
Error
Amp-
V_CC
5.0 V
REF
Oscillator
Q2
16
Noninv
Input
15
Inv
Input
14 V_ref
13
Output
Contro
l
12 V_CC
11 C2
10 E2
C1 8
Q1
9 E1
(Top View)
Derating Ambient Temperature
T_A
1. Maximum thermal limits must be observed.
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
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Http: www.ceramate.com.tw
Rev 1.0 Apr.19,2004