ET-KA7500 Datasheet, PDF (1/4 Pages) Estek Electronics Co. Ltd – SWITCHMODE Pulse Width Modulation Control Circuit

ET-KA7500
SWITCHMODE Pulse Width Modulation Control Circuit
The KA7500 is a fixed frequency, pulse width modu lation 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
16
1
N SUFFIX
PLASTIC
ORDERING INFORMATION
KA 7500
Plastic
KA 7500
Chip
T_A = - 20° to +85°C
LOGIC DIAGRAM
56
13
output control
dead time control
oscillator
4
error amp 1
pulce steering flip
flop
1
PWM comparator
2
&
T
error amp 2
16
15
reference
regulator
3
7 12 14
Pin 7 = GND
Pin 12 = V_cc
PIN ASSIGNMENT
noninv. input 1 16 noninv. input
inv. input ^{2 15} inv. input
feedback 3 14 ref. output
KA
dead time control 7500 output control
8
C_T 5 12 Vcc
9
11
R_T 6 11 collector 2
10
gnd 7 10 ^{emitter 2}
collector 1 ^{8 9 emitter 1}
1
BEIJING ESTEK ELECTRONICS CO.,LTD