FAIRCHILD KA7500CDTF

KA7500C
SMPS Controller
Features
Description
ƒ
Internal Regulator Provides a Stable 5V Reference
Supply Trimmed to ±1% Accuracy
ƒ
Uncommitted Output TR for 200mA Sink or Source
Current
The KA7500C is used for the control circuit of the pulsewidth 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.
ƒ
Output Control for Push-Pull or Single-Ended
Operation
ƒ
Variable Duty Cycle by Dead-Time Control (Pin 4)
Complete PWM Control Circuit
ƒ
ƒ
On-Chip Oscillator with Master or Slave Operation
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.
Internal Circuit Prohibits Double Pulse at Either
Output
16-Lead DIP
16-Lead SOP
Ordering Information
Part Number
Operating
Temperature Range
Eco
Status
KA7500C
KA7500CD
Package
16-Lead Dual Inline Package (DIP)
-25 to +85°C
KA7500CDTF
RoHS
16-Lead Small Outline Package (SOP)
Packing Method
Tube
Tube
Tape and Reel
For Fairchild’s definition of Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.
© 2003 Fairchild Semiconductor Corporation
KA7500C • Rev. 1.0.2
www.fairchildsemi.com
KA7500C — SMPS Controller
April 2009
KA7500C — SMPS Controller
Block Diagram
Figure 1. Block Diagram
© 2003 Fairchild Semiconductor Corporation
KA7500C • Rev. 1.0.2
www.fairchildsemi.com
2
KA7500C — SMPS Controller
Typical Application
KSA1010
V I =10V to 40V
V O =5V
I O =1A
1mH, 2A
47 Ω
150 Ω
0.1µF
12
VC C
11
C2
8
C1
1MΩ
50µF
10V +
-2
3
COMP INPUT
5.1KΩ
V R EF 14
5.1KΩ
- 15
KA7500C
5.1KΩ
+1
150 Ω
D.T
4
GND
7
E1
9
E2
10
O.C
13
CT
5
RT
6
+ 16
+
50µF
50V
47KΩ
+
0.001µF
500µF
10V
+
GND
0.1
Figure 2. Pulse-Width Modulated Step-Down Converter
© 2003 Fairchild Semiconductor Corporation
KA7500C • Rev. 1.0.2
www.fairchildsemi.com
3
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be
operable above the recommended operating conditions and stressing the parts to these levels is not recommended.
In addition, extended exposure to stresses above the recommended operating conditions may affect device
reliability. The absolute maximum ratings are stress ratings only.
Symbol
VCC
Parameter
Min.
Max.
Unit
42
V
Supply Voltage
VC
Collector Supply Voltage
42
V
IO
Output Current
250
mA
VIN
Amplifier Input Voltage
VCC + 0.3
V
PD
Power Dissipation
KA7500C
1
KA7500CD
W
0.9
TOPR
Operation Temperature Range
-25
+85
°C
TSTG
Storage Temperature Rang
-65
+150
°C
+125
°C
TJ
Junction Temperature
KA7500C — SMPS Controller
Absolute Maximum Ratings
Recommended Operating Conditions
The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended
operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not
recommend exceeding them or designing to Absolute Maximum Ratings.
Symbol
VCC
VC1, VC2
IC1, IC2
Parameter
Power Supply Voltage
Typ.
Max.
Unit
7
15
40
V
30
40
V
Collector Supply Voltage
Collector Output Current (Each Transition)
VIN
Amplifier Input Voltage
IFB
Current Into Feedback Terminal
IREF
Reference Output Terminal
RT
Timing Resistor
CT
Timing Capacitor
fOSC
Oscillator Frequency
VIN_PWM
Min.
0.3
PWM Input Voltage (Pins 3, 4, and 13)
© 2003 Fairchild Semiconductor Corporation
KA7500C • Rev. 1.0.2
200
mA
VCC - 2.0
V
0.3
mA
10
mA
1.8
30.0
500.0
KΩ
0.0047
0.0010
10.0000
µA
1
40
200
kHz
5.3
V
0.3
www.fairchildsemi.com
4
VCC = 20V, f = 10kHz, TA = -25°C to +85°C, unless otherwise specified.
Symbol
Parameter
Conditions
Min.
Typ.
Max.
IREF=1mA, TA=25°C
4.95
5.00
5.05
IREF=1mA
4.90
5.00
5.10
Units
Reference Section
(1)
V
VREF
Reference Output Voltage
RLINE
Line Regulation
VCC=7V to 40V
2
25
mV
RLOAD
Load Regulation
IREF=1mA to 10mA
1
15
mV
Short-Circuit Output Current
VREF=0V
35
50
mA
ISC
10
Oscillation Frequency
40.0
CT=0.001µF, RT=30KΩ
fOSC
Δf/Δt
Oscillation Frequency
Frequency Change with Temperature
CT=0.01µF, RT=12KΩ,
TA=25°C
9.2
CT=0.01µF, RT=12KΩ,
TA=TLOW to THIGH
9.0
10.0
10.8
KA7500C — SMPS Controller
Electrical Characteristics
kHz
12.0
CT=0.01µF, RT=12KΩ
2
%
-10
µA
Dead-Time Control Section
IBIAS
D(MAX)
VITH
Input Bias Current
VCC=15V, 0V≤ V4≤ 5.25V
Maximum Duty Cycle
VCC=15V, V4=0V, OC
Pin=VREF
Input Threshold Voltage
-2
45
Zero Duty Cycle
%
3.0
Maximum Duty Cycle
3.3
0
V
Error Amplifier Section
VIO
Input Offset Voltage
V3=2.5V
2
10
mV
IIO
Input Offset Current
V3=2.5V
25
250
mA
1.0
µA
VCC
V
IBIAS
Input Bias Current
V3=2.5V
VCIM
Common Mode Input Voltage
7V≤ VCC ≤ 40V
-0.3
0.2
GVO
Open-Loop Voltage Gain
0.5V≤ V3 ≤ 3.5V
70
BW
Unit-Gain Bandwidth
95
dB
650
kHz
PWM Comparator Section
VITH
Input Threshold Voltage
Zero Duty Cycle
ISINK
Input Sink Current
V3=0.7V
4.0
-0.3
4.5
-0.7
V
mA
Output Section
VCE(SAT)
Output Saturation Voltage Common
Emitter
VE=0V, IC=200mA
1.0
1.3
VCC(SAT)
Emitter-Follower
VC=15V, IE=-200mA
1.5
2.5
IC(OFF)
Collector Off-State Current
VCC=40V, VCE=40V
2
100
IE(OFF)
Emitter Off-State Current
VCC=VC=40V, VE=40V
-100
V
µA
Total Device
ICC
Supply Current
Pin6=VREF, VCC=15V
6
10
mA
Output Switching Characteristics
tR
Rise Time, Common Emitter,
Common Collector
100
200
tF
Fall Time, Common Emitter,
Common Collector
25
100
ns
Note:
1. This is guaranteed where the marking code of the package surface is over 027.
© 2003 Fairchild Semiconductor Corporation
KA7500C • Rev. 1.0.2
www.fairchildsemi.com
5
10.10
9.70
A
9.08
8.68
16
6.00
0.65
B
9
4.15
3.75
B
5.60
B
(0.30)
1.75
8
#1
1.27
KA7500C — SMPS Controller
Physical Dimensions
0.51
0.36
#1
0.20
1.27
C B A
TOP VIEW
LAND PATTERN RECOMMENDATION
1.80 MAX
SEE DETAIL A
1.65
1.45
(R0.20)
c
0.303
0.153
0.05 MIN
B
SIDE VIEW
0.10 MAX C
END VIEW
NOTES:
A) THIS DRAWING GOMPLIES WITH JEDEC MS-012
EXCEPT AS NOTED.
B) THIS DEMENSION IS OUTSIDE THE JEDEC MS-012 VALUE.
C) ALL DIMENSIONS ARE IN MILLIMETERS.
D) DIMENSIONS ARE EXCLUSIVE OF BURRS, MOLD FLASH,
AND TIE BAR EXTRUSIONS.
E) LANDPATTERN STANDARD: SOIC127P600X175-16AM.
F) DRAWING FILE NAME AND REVISION : M16EREV1
8¡Æ
GAGE
PLANE
(R0.10)
0.90
0.50
0.36
SEATING
PLANE
DETAIL A
Figure 3. 16-Lead Small Outline Package (SOP)
Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner
without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify
or obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions, specifically
the warranty therein, which covers Fairchild products.
Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings:
http://www.fairchildsemi.com/packaging/.
© 2003 Fairchild Semiconductor Corporation
KA7500C • Rev. 1.0.2
www.fairchildsemi.com
6
KA7500C — SMPS Controller
Physical Dimensions
19.68
18.66
16
A
9
6.60
6.09
1
8
(0.40)
TOP VIEW
0.38 MIN
5.33 MAX
8.13
7.62
3.42
3.17
3.81
2.92
2.54
0.35
0.20
0.58 A
0.35
1.78
1.14
15
0
8.69
17.78
SIDE VIEW
NOTES: UNLESS OTHERWISE SPECIFIED
A THIS PACKAGE CONFORMS TO
JEDEC MS-001 VARIATION BB
B) ALL DIMENSIONS ARE IN MILLIMETERS.
C) DIMENSIONS ARE EXCLUSIVE OF BURRS,
MOLD FLASH, AND TIE BAR PROTRUSIONS
D) CONFORMS TO ASME Y14.5M-1994
E) DRAWING FILE NAME: N16EREV1
Figure 4. 16-Lead Dual Inline Package (DIP
Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner
without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify
or obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions, specifically
the warranty therein, which covers Fairchild products.
Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings:
http://www.fairchildsemi.com/packaging/.
© 2003 Fairchild Semiconductor Corporation
KA7500C • Rev. 1.0.2
www.fairchildsemi.com
7
KA7500C — SMPS Controller
© 2003 Fairchild Semiconductor Corporation
KA7500C • Rev. 1.0.2
www.fairchildsemi.com
8