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KA7500C Datasheet(PDF) 1 Page - Fairchild Semiconductor

Part No. KA7500C
Description  SMPS Controller
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Manufacturer  FAIRCHILD [Fairchild Semiconductor]
Direct Link  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

KA7500C Datasheet(HTML) 1 Page - Fairchild Semiconductor

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©2003 Fairchild Semiconductor Corporation
www.fairchildsemi.com
Rev. 1.0.1
Features
• Internal Regulator Provides a Stable 5V Reference Supply
Trimmed to
±1% Accuracy.
• Uncommitted Output TR for 200mA Sink or Source
Current
• Output Control for Push-Pull or Single-Ended Operation
• Variable Duty Cycle by Dead Time Control (Pin 4)
Complete PWM Control Circuit
• On-Chip Oscillator With Master or Slave Operation
• Internal Circuit Prohibits Double Pulse at Either Output
Description
The KA7500C is used for the control circuit of the pulse
width modulation switching regulator. The KA7500C
consists of 5V reference voltage circuit, two error amplifiers,
flip flop, an output control circuit, a PWM comparator, a
dead time comparator and an oscillator. This device can be
operated in the switching frequency of 1kHz to 300kHz. The
precision of voltage reference (Vref) is improved up to
±1%
with trimming. This provides a better output voltage
regulation. The operating temperature range is
-25
°C ~ +85°C.
16-DIP
16-SOP
1
1
Internal Block Diagram
OSCILLATOR
6
5
4
1
2
16
15
3
7
14
12
10
11
9
8
13
BAND GAP
REFERENCE
1
2
+
_
+
_
0.7MA
D
CK
Q
Q
C1
E1
C2
E2
VCC
VREF
GND
COMP INPUT
OUTPUT CONTROL
5V
RT
CT
DEAD
TIME
CONTROL
EA(+)
EA(-)
EA(+)
EA(-)
1.2V
PWM
COMP
KA7500C
SMPS Controller


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