FAIRCHILD KA7500C

www.fairchildsemi.com
KA7500C
SMPS Controller
Features
Description
• 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
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
OUTPUT CONTROL
13
RT
6
CT
5
OSCILLATOR
D
8
C1
9
E1
Q
11 C2
CK
DEAD 4
TIME
CONTROL
1.2V
10 E2
PWM
COMP
EA(+) 1
EA(-)
5V
+
_ 1
BAND GAP
REFERENCE
2
EA(+) 16
EA(-) 15
Q
14 VREF
0.7MA
+
_
12 VCC
7 GND
2
3
COMP INPUT
Rev. 1.0.1
©2003 Fairchild Semiconductor Corporation
KA7500C
Absolute Maximum Ratings
Parameter
Symbol
Value
Unit
VCC
42
V
VC
42
V
Supply Voltage
Collector Supply Voltage
Output Current
IO
250
mA
Amplifier Input Voltage
VIN
VCC +0.3
V
Power Dissipation (TA = 25°C)
PD
1 (KA7500C)
0.9 (KA7500CD)
W
Operating Temperature Range
TOPR
-25 ~ +85
°C
Storage Temperature Range
TSTG
-65 ~ +150
°C
Tj
125
°C
Junction Temperature
Recommended Operating Conditions
Parameter
Power Supply Voltage
Collector Output Voltage
Min.
Typ.
Max.
Unit
VCC
7.0
15
40
V
VC1,VC2
-
30
40
V
IC1,IC2
-
-
200
mA
Amplifier Input Voltage
VIN
0.3
-
VCC-2.0
V
Current Into Feedback Terminal
Ifb
-
-
0.3
mA
Reference Output Current
Iref
-
-
10
mA
Timing Resistor
RT
1.8
30
500
ΚΩ
Timing Capacitor
CT
0.0047
0.001
10
uF
Oscillator Frequency
fosc
1.0
40
200
kHz
-
0.3
-
5.3
V
Collector Output Current (Each Transistor)
PWM Input Voltage (Pins3, 4, 13)
2
Symbol
KA7500C
Electrical Characteristics
(VCC = 20V, f = 10kHz, TA = -25°C to +85°C, unless otherwise specified)
Parameter
Symbol
Conditions
Min.
Typ. Max. Unit
REFERENCE SECTION
Reference Output Voltage
VREF
Line Regulation
RLine
Load Regulation
RLOAD
Short Circuit Output Current
ISC
IREF = 1mA, TA=25°C(Note1)
4.95
5.0
5.05
IREF = 1mA
4.9
5.0
5.1
V
VCC = 7V to 40V
-
2.0
25
mV
IREF = 1mA to 10mA
-
1.0
15
mV
10
35
50
mA
-
40
-
CT = 0.001µF, RT = 12KΩ,TA=25°C
9.2
10
10.8
CT = 0.001µF, RT = 30KΩ,
TA=Tlow to Thigh
9.0
-
12
VREF = 0V
OSCILLATOR SECTION
CT = 0.001µF, RT = 30KΩ
Oscillation Frequency
Frequency Change with
Temperature
fosc
kHz
∆f/∆T
CT = 0.01µF, RT = 12KΩ
-
-
2
%
IBIAS
VCC = 15V, 0V ≤ V4 ≤ 5.25V
-
-2.0
-10
µA
45
-
-
%
Zero Duty Cycle
-
3.0
3.3
Max. Duty Cycle
0
-
-
DEAD TIME CONTROL SECTION
Input Bias Current
Maximum Duty Cycle
Input Threshold Voltage
D(MAX)
VITH
VCC = 15V, V4 = 0V
O.C Pin = VREF
V
ERROR AMP SECTION
Input Offset Voltage
VIO
V3 = 2.5V
-
2.0
10
mV
Input Offset Current
IIO
V3 = 2.5V
-
25
250
mA
Input Bias Current
IBIAS
V3 = 2.5V
-
0.2
1.0
µA
Common Mode Input Voltage
VCM
7V ≤ VCC ≤ 40V
-0.3
-
VCC
V
Open-Loop Voltage Gain
GVO
0.5V ≤ V3 ≤ 3 .5V
Unit-Gain Bandwidth
BW
-
70
95
-
dB
-
650
-
kHz
-
4
4.5
V
-0.3
-0.7
-
mA
-
1.1
1.3
V
PWM COMPARATOR SECTION
Input Threshold Voltage
VITH
Zero Duty Cycle
Input Sink Current
ISINK
V3 = 0.7V
OUTPUT SECTION
Output Saturation Voltage
Common Emitter
VCE(SAT)
VE = 0V, IC = 200mA
3
KA7500C
Electrical Characteristics (Continued)
(VCC = 20V, f = 10kHz, TA = -25°C to +85°C, unless otherwise specified)
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Unit
VCC(SAT)
VC = 15V, IE = -200mA
-
1.5
2.5
V
Collector Off-State Current
IC(OFF)
VCC = 40V, VCE = 40V
-
2
100
µA
Emitter Off-State Current
IE(OFF)
VCC = VC = 40V, VE = 0V
-
-
-100
-
ICC
Pin 6 = VREF, VCC = 15V
-
6
10
mA
tR
-
-
100
200
ns
tF
-
-
25
100
ns
Emitter-Follower
TOTAL DEVICE
Supply Current
OUTPUT SWITCHING CHARACTERISTIC
Rise Time
Common Emitter, Common Collector
Fall Time
Common Emitter, Common Collector
Note :
1. This is guaranteed where the marking code of the package surface is over 027
4
KA7500C
Typical Application
Pulse Width Modulated Step-down Converter
KSA1010
VI =10V to 40V
VO=5V
IO=1A
1mH, 2A
47Ω
150Ω
0.1uF
12
VCC
50uF
10V +
3
COMP INPUT
8
C1
11
C2
1MΩ
-2
5.1KΩ
VREF 14
5.1KΩ
KA7500C
- 15
5.1KΩ
+1
150Ω
D.T
4
GND
7
E1
9
E2
10
O.C
13
RT
6
CT
5
+ 16
+
+
50uF
50V
47KΩ
+
0.001uF
500uF
10V
GND
0.1
5
KA7500C
Mechanical Dimensions
Package
Dimensions in millimeters
16-SOP
0.51
)
0.020
0.05
0.002
0.70 ±0.20
0.0275 ±0.008
6
1.27
0.050
1.80
MAX
0.071
8°
MAX0.10
MAX0.004
3.95 ±0.20
0.156 ±0.008
0~
+0.004
0.008 -0.002
0.20
+0.10
-0.05
6.00 ±0.30
0.236 ±0.012
5.72
0.225
+0.10
-0.05
#9
0.406
#8
9.90 ±0.20
0.39 ±0.008
#16
10.30
MAX
0.405
#1
(
1.55 ±0.10
0.061 ±0.004
+0.004
0.016 -0.002
MIN
KA7500C
Mechanical Dimensions (Continued)
Package
Dimensions in millimeters
16-DIP
#9
7.62
0.300
2.54
0.100
1.50 ±0.10
0.059 ±0.004
#8
0.46 ±0.10
0.018 ±0.004
#16
19.80
MAX
0.780
#1
19.40 ±0.20
0.764 ±0.008
(
0.81
)
0.032
6.40 ±0.20
0.252 ±0.008
3.25 ±0.20
0.128 ±0.008
5.08
MAX
0.200
0.38
0.014 MIN
3.30 ±0.30
0.130 ±0.012
+0.10
0~15°
0.25 –0.05
+0.004
0.010 –0.002
7
KA7500C
Ordering Information
Product Number
Package
KA7500C
16-DIP
KA7500CD
16-SOP
Operating Temperature
-25 ~ +85°C
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.
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.
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 2003 Fairchild Semiconductor Corporation