Fairchild Semiconductor KA7500B Datasheet
KA7500B
SMPS Controller
www.fairchildsemi.com
Features
• Internal Regula tor Provide s a Stable 5V Re ference Sup ply
Trimmed to 5%
• Uncommitt ed Output TR for 200mA Si nk 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
Internal Block Diagram
Description
The KA7500B is used for the control circuit of the PWM
switching regulator. The KA7500B consists of 5V reference
voltage circuit, two error amplifiers, a 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.
16-DIP
1
16-SOP
1
©2002 Fairchild Semiconductor Corporation
Rev. 1.0.0
KA7500B
Absolute Maximum Ratings
Parameter Symbol Value Unit
Supply Voltage V
Collector Supply Voltage V
Output Current I
Amplifier Input Voltage V
Power Dissipation (T
= 25°C) P
A
Operating Temperature Range T
Storage Temperature Range T
CC
C
O
IN
D
OPR
STG
42 V
42 V
250 mA
V
+0.3 V
CC
1 (KA7500B)
0.9 (KA7500BD)
0 ~ +70 °C
-65 ~ +150 °C
W
2
KA7500B
Electrical Characteristics
(VCC = 20V, f = 10kHz, TA = 0°C to +70°C, unless otherwise specified)
Parameter Symbol Conditions Min. Typ. Max. Unit
REFERENCE SECTION
Reference Output Voltage V
Line Regulation ∆V
Temperature Co efficient of V
REF
Load Regulati on ∆V
Short-Circuit Output Current I
∆V
REF
REF
REF
REF
SC
OSCILLATOR SECTION
Oscillation Frequency f C
Frequency Change with Temperature ∆f/∆TC
DEAD TIME CONTROL SECTION
Input Bias Current I
Maximum Duty Cycle D
Input Thresho ld Voltage V
BIAS
(MAX)
ITH
ERROR AMP SECTION
Input Offset Voltage V
Input Offset Current I
Input Bias Current I
Common Mode Input Voltage V
Open-Loop Voltage Gain G
IO
IO
BIAS
CM
VO
Unit-Gain Bandwidth (Note1) BW - -650-kHz
PWM COMPARATOR SECT ION
Input Threshold Voltage V
Input Sink Current I
ITH
SINK
OUTPUT SECTION
Output Saturation Voltage
Common Emitter
Common Collector V
Collector Off-State Curr en t I
Emitter Off-State Current I
V
CE(SAT)
CC(SAT)
C(OFF)
E(OFF)
TOTAL DEVICE
Supply Current I
CC
OUTPUT SWITCHING CHARACTERISTIC S
Rise Time t
R
Common Emitter - - -100200
Common Collector - - -100200
Fall Time t
F
Common Emitter - - -25100
Common Collector - - -40100
I
= 1mA 4.75 5.0 5.25 V
REF
VCC = 7V to 40V - 2.0 25 mV
/∆TTA = 0°C to 70°C - 0.01 0.03 %/°C
I
= 1mA to 10mA - 1.0 15 mV
REF
V
= 0V 10 35 50 mA
REF
= 0.01µF, RT = 12kΩ -10-kHz
T
= 0.01µF, RT = 12kΩ --2%
T
VCC = 15V, 0V≤V
VCC = 15V, V4 = 0V
O.C Pin = V
Zero Duty Cycle - 3.0 3.3
Max. Duty Cycle 0 - -
≤5.25V - -2.0 -10 µA
4
REF
45 - - %
V
V3 = 2.5V - 2.0 10 mV
V3 = 2.5V - 25 250 mA
V3 = 2.5V - 0.2 1 .0 µA
7V ≤ V
0.5V ≤ V
≤ 40V -0.3 - V
CC
≤3 .5V 70 95 - dB
3
CC
V
Zero Duty Cycle - 4 4.5 V
V3=0.7V -0.3 -0.7 - mV
VE = 0, IC = 200mA - 1.1 1.3
VC = 15V, IE = -200mA - 1.5 2.5
VCC = 40V, VCE = 40V - 2 100
VCC = VC = 40V, VE = 0 - - -100
Pin 6 = V
, VCC = 15V - 6 10 mA
REF
V
µA
- ----
ns
- ----
ns
Note:
1. This parameter, although guaranteed, is not 100% tested in production.
3
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