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
V
CC
V
REF
GND
COMP INPUT
OUTPUT CONTROL
5V
R
T
C
T
DEAD
TIME
CONTROL
EA(+)
EA(-)
EA(+)
EA(-)
1.2V
PWM
COMP
KA7500C
SMPS Controller
KA7500C
2
Absolute Maximum Ratings
Recommended Operating Conditions
Parameter
Symbol
Value
Unit
Supply Voltage
V
CC
42
V
Collector Supply Voltage
V
C
42
V
Output Current
I
O
250
mA
Amplifier Input Voltage
V
IN
V
CC
+0.3
V
Power Dissipation (T
A
= 25
C)
P
D
1 (KA7500C)
0.9 (KA7500CD)
W
Operating Temperature Range
T
OPR
-25 ~ +85
C
Storage Temperature Range
T
STG
-65 ~ +150
C
Junction Temperature
T
j
125
C
Parameter
Symbol
Min.
Typ.
Max.
Unit
Power Supply Voltage
V
CC
7.0
15
40
V
Collector Output Voltage
V
C1,
V
C2
-
30
40
V
Collector Output Current (Each Transistor)
I
C1,
I
C2
-
-
200
mA
Amplifier Input Voltage
V
IN
0.3
-
V
CC
-2.0
V
Current Into Feedback Terminal
I
fb
-
-
0.3
mA
Reference Output Current
I
ref
-
-
10
mA
Timing Resistor
R
T
1.8
30
500
Timing Capacitor
C
T
0.0047
0.001
10
uF
Oscillator Frequency
f
osc
1.0
40
200
kHz
PWM Input Voltage (Pins3, 4, 13)
-
0.3
-
5.3
V
KA7500C
3
Electrical Characteristics
(V
CC
= 20V, f = 10kHz, T
A
= -25
C to +85
C, unless otherwise specified)
Parameter
Symbol
Conditions
Min. Typ. Max. Unit
REFERENCE SECTION
Reference Output Voltage
V
REF
I
REF
= 1mA, T
A
=25
C(Note1)
4.95
5.0
5.05
V
I
REF
= 1mA
4.9
5.0
5.1
Line Regulation
R
Line
V
CC
= 7V to 40V
-
2.0
25
mV
Load Regulation
R
LOAD
I
REF
= 1mA to 10mA
-
1.0
15
mV
Short Circuit Output Current
I
SC
V
REF
= 0V
10
35
50
mA
OSCILLATOR SECTION
Oscillation Frequency
f
osc
C
T
= 0.001
F, R
T
= 30K
-
40
-
kHz
C
T
= 0.001
F, R
T
= 12K
,T
A
=25
C
9.2
10
10.8
C
T
= 0.001
F, R
T
= 30K
,
T
A
=T
low
to T
high
9.0
-
12
Frequency Change with
Temperature
f/
T
C
T
= 0.01
F, R
T
= 12K
-
-
2
%
DEAD TIME CONTROL SECTION
Input Bias Current
I
BIAS
V
CC
= 15V, 0V
V
4
5.25V
-
-2.0
-10
A
Maximum Duty Cycle
D
(MAX)
V
CC
= 15V, V
4
= 0V
O.C Pin = V
REF
45
-
-
%
Input Threshold Voltage
V
ITH
Zero Duty Cycle
-
3.0
3.3
V
Max. Duty Cycle
0
-
-
ERROR AMP SECTION
Input Offset Voltage
V
IO
V
3
= 2.5V
-
2.0
10
mV
Input Offset Current
I
IO
V
3
= 2.5V
-
25
250
mA
Input Bias Current
I
BIAS
V
3
= 2.5V
-
0.2
1.0
A
Common Mode Input Voltage
V
CM
7V
V
CC
40V
-0.3
-
V
CC
V
Open-Loop Voltage Gain
G
VO
0.5V
V
3
3 .5V
70
95
-
dB
Unit-Gain Bandwidth
BW
-
-
650
-
kHz
PWM COMPARATOR SECTION
Input Threshold Voltage
V
ITH
Zero Duty Cycle
-
4
4.5
V
Input Sink Current
I
SINK
V
3
= 0.7V
-0.3
-0.7
-
mA
OUTPUT SECTION
Output Saturation Voltage
Common Emitter
V
CE(SAT)
V
E
= 0V, I
C
= 200mA
-
1.1
1.3
V
KA7500C
4
Electrical Characteristics
(Continued)
(V
CC
= 20V, f = 10kHz, T
A
= -25
C to +85
C, unless otherwise specified)
Note :
1. This is guaranteed where the marking code of the package surface is over 027
Parameter
Symbol
Conditions
Min.
Typ. Max. Unit
Emitter-Follower
V
CC(SAT)
V
C
= 15V, I
E
= -200mA
-
1.5
2.5
V
Collector Off-State Current
I
C(OFF)
V
CC
= 40V, V
CE
= 40V
-
2
100
A
Emitter Off-State Current
I
E(OFF)
V
CC
= V
C
= 40V, V
E
= 0V
-
-
-100
-
TOTAL DEVICE
Supply Current
I
CC
Pin 6 = V
REF
, V
CC
= 15V
-
6
10
mA
OUTPUT SWITCHING CHARACTERISTIC
Rise Time
t
R
-
-
100
200
ns
Common Emitter, Common Collector
Fall Time
t
F
-
-
25
100
ns
Common Emitter, Common Collector
KA7500C
5
Typical Application
Pulse Width Modulated Step-down Converter
KA7500C
12
V
CC
11
C2
8
C1
3
COMP INPUT
- 2
V
REF
14
- 15
+ 1
+ 16
C
T
5
R
T
6
D.T
4
GND
7
E1
9
E2
10
O.C
13
KSA1010
V
I
=10V to 40V
1mH, 2A
V
O
=5V
I
O
=1A
GND
47
150
1M
5.1K
5.1K
5.1K
150
47K
0.001uF
+
50uF
50V
+
0.1
+
50uF
10V
0.1uF
+
500uF
10V
KA7500C
6
Mechanical Dimensions
Package
Dimensions in millimeters
0.70
0.20
0.0275
0.008
#1
#8
#9
#16
9.90
0.20
0.39
0.008
1.27
0.050
5.72
0.225
1.55
0.10
0.061
0.004
0.05
0.002
6.00
0.30
0.236
0.012
3.95
0.20
0.156
0.008
10.30
0.405
MAX
0~8
0.51
0.020
()
1.80
0.071
MAX0.10
MAX0.004
MAX
MIN
+
0.10
-0.05
0.20
+
0.004
-0.002
0.008
+
0.10
-0.05
0.406
+
0.004
-0.002
0.016
16-SOP
KA7500C
7
Mechanical Dimensions
(Continued)
Package
Dimensions in millimeters
#1
#8
#9
#16
6.40
0.20
7.62
0.300
2.54
0.100
0.252
0.008
0~15
0.25
+0.10
0.05
0.010
+0.004
0.002
3.30
0.30
0.130
0.012
3.25
0.20
0.128
0.008
19.40
0.20
0.764
0.008
19.80
0.780
MAX
5.08
0.200
0.38
0.014
MAX
MIN
0.81
0.032
()
0.46
0.10
0.018
0.004
0.059
0.004
1.50
0.10
16-DIP
KA7500C
5/9/03 0.0m 001
Stock#DSxxxxxxxx
2003 Fairchild Semiconductor Corporation
LIFE SUPPORT POLICY
FAIRCHILD'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES
OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR
CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body,
or (b) support or sustain life, and (c) whose failure to
perform when properly used in accordance with
instructions for use provided in the labeling, can be
reasonably expected to result in a significant injury of the
user.
2. A critical component in any component of a life support
device or system whose failure to perform can be
reasonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
www.fairchildsemi.com
DISCLAIMER
FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY
PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY
LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER
DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.
Ordering Information
Product Number
Package
Operating Temperature
KA7500C
16-DIP
-25 ~ +85
C
KA7500CD
16-SOP
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