TL494 Datasheet, PDF (1/12 Pages) Motorola, Inc – SWITCHMODE PULSE WIDTH MODULATION CONTROL CIRCUIT

Order this document by TL494/D
SWITCHMODE™ Pulse Width
Modulation Control Circuit
The TL494 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
TL494
SWITCHMODE
PULSE WIDTH MODULATION
CONTROL CIRCUIT
SEMICONDUCTOR
TECHNICAL DATA
D SUFFIX
PLASTIC PACKAGE
CASE 751B
(SO–16)
N SUFFIX
PLASTIC PACKAGE
CASE 648
PIN CONNECTIONS
MAXIMUM RATINGS (Full operating ambient temperature range applies,
unless otherwise noted.)
Rating
Symbol TL494C TL494I Unit
Power Supply Voltage
Collector Output Voltage
Collector Output Current
(Each transistor) (Note 1)
VCC
42
V
VC1,
42
V
VC2
IC1, IC2
500
mA
Amplifier Input Voltage Range
Power Dissipation @ TA ≤ 45°C
Thermal Resistance,
Junction–to–Ambient
VIR
PD
R_θJA
–0.3 to +42
1000
80
V
mW
°C/W
Operating Junction Temperature
TJ
Storage Temperature Range
Tstg
Operating Ambient Temperature Range TA
TL494C
TL494I
125
°C
–55 to +125
°C
°C
0 to +70
– 25 to +85
Derating Ambient Temperature
TA
NOTE: 1. Maximum thermal limits must be observed.
45
°C
Noninv
Input
1
Inv
Input
2
+
Error
–Amp
1
Compen/PWN
Comp Input
3
Deadtime
Control
4
≈ 0.1 V
+
2
Error
Amp–
VCC
5.0 V
REF
16
Noninv
Input
15
Inv
Input
14 Vref
13
Output
Control
CT 5
RT 6
Ground 7
Oscillator
12 VCC
11 C2
Q2
10 E2
C1 8
Q1
9 E1
(Top View)
ORDERING INFORMATION
Device
Operating
Temperature Range
Package
TL494CD
TL494CN
TA = 0° to +70°C
SO–16
Plastic
TL494IN TA = – 25° to +85°C
Plastic
MOTOROLA ANALOG IC DEVICE DATA
© Motorola, Inc. 1996
Rev 1
1