Page 1
KA3525A SMPS CONTROLLER
VOLTAGE-MODE PWM CONTROLLER
The KA3525A is a monolithic integrated circuit that Included all of
the control circuit necessary for a pulse width modulating regulator.
There are a voltage
modulator, an oscillator, under-voltage lockout, soft start circuit, and
output drivers in the chip.
reference, an error amplifier, a pulse width
FEATURES
• 5V ä1% Reference
• Oscillator Syn c Ter minal
• Internal Soft Start
• Deadtime Control
• Under-Voltage Lockout
ORDERING INFORMATION
KA3525A 16 DIP
BLOCK DIAGRAM
KA3525AD 16-SOP-225A
Device Package Operating Temperature
16-DIP
16-SOP-225A
-30 ~ +85
-30 ~ +85
Î
Î
5.5K
43K
©1999 Fairchild Semiconductor Corporation
5.5K
Rev. B
Page 2
KA3525A SMPS CONTROLLER
ABSOLUTE MAXIMUM RATINGS
Characteristic Symbol Value Unit
Supply Voltage V
Collector Supply Voltage V
Output Current, Sink or Source I
Reference Output Current I
Oscillator Charging Current I
CHG(OSC)
Power Dissipation (TA = 25Î)
Operating Temperature T
Storage Temperature T
Lead Temperature (Soldering, 10 sec) T
ELECTRICAL CHARACTERISTICS
(VCC = 20V, TA = -35Î to + 85Î, unless otherwise specified)
Characteristic Symbol Test Conditions Min Typ Max Unit
REFERENCE SECTION
Reference Output Voltage V
Line Regulation
Load Regulation
Short Circuit Output Current I
Total Output Variation (Note 1)
Temperature Stability (Note 1) ST
Long Term Stability (Not e 1) ST
OSCILLATOR SECTION
Initial Accuracy (Note 1, 2)
Frequency Change With Voltage
Maximum Frequency f
Minimum Frequency f
Clock Amplitude (Note 1, 2) V
Clock Width (Note 1, 2) t
Sync Threshold V
Sync Input Current I
REF
L
V
L
V
SC
L
V
ACCUR
Lf/L
(MAX)
(MIN)
(CLK)
W(CLK)
TH(SYNC)
I(SYNC)
REF
REF
REF
Line, Load and Temperature 4.95 5.25 V
T
V
V
CC
RT = 200K`, CT = 0.1sF
CC
C
O
REF
P
D
OPR
STG
LEAD
TJ = 25
Î
VCC = 8 to 35V 9 20 mV
I
= 0 to 20mA 20 50 mV
REF
V
= 0, TJ = 25
REF
= 125Î, 1 KH
T
J
= 25
Î
T
J
= 8 to 35V (Note 1, 2)
CC
RT = 2K`, CT = 470pF
TJ = 25
Î
Sync = 3.5V 1.3 2.5 mA
40 V
40 V
500 mA
50 mA
5mA
1000 m/W
0 ~ +70
-65 ~ +150
+300
Î
Î
Î
5.0 5.1 5.2 V
Î
80 100 mA
20 50 mV
RS
20 50 mV
ä
3
ä
6
ä
0.8
ä
2
400 430 KHz
60 120 Hz
34 V
0.3 0.6 1
1.222.8V
%
%
s
s
Page 3
KA3525A SMPS CONTROLLER
ELECTRICAL CHARACTERISTICS
(VCC = 20V, TA = -35Î to +85Î, unless otherwise specified)
Characteristic Symbol Test Conditions Min Typ Max Unit
(V
ERROR AMPLIFIER SECTION
Input Offset Voltage V
Input Bias Current I
Input Offset Current I
Open Loop Voltage Gain G
Common Mode Rejection Ratio CMRR V
Power Supply Rejection Ratio PSRR VCC = 8 to 3.5V 50 60 dB
PWM COMPARATOR SECTION
Minimum Duty Cycle D
Maximum Dut y Cycle D
Input Threshold Voltage (Note 2) V
Input Threshold Voltage (N0te 2) V
SOFT-START SECTION
Soft Start Current I
Soft Start Low Level Voltage V
Shutdown Threshold Voltage V
Shutdown Input Current I
OUTPUT SECTION
Low Output Voltage I V
Low Output Voltage II V
High Output Voltage I V
High Output Voltage II V
Under Voltage Lockout V
Collector Leakage Current I
Rise Time (Note 1) t
Fall Time (Note 1) t
STANDBY CURRENT
Supply Cuttent I
(Note)
1. These parameters. although guaranteed over the recommended operating conditions, are not 100% tested in
production
2. Tested at f
=40 KHz (RT =3.6K, CT =0.01sF, R
OSC
CM
= 5.1V)
IO
BAIS
IO
VO
(MIN)
(MAX)
TH1
TH2
SOFT
SL
TH(SD)
N(SD)
OL I
OL II
CH I
CH II
UV
LKG
R
F
CC
1.5 10 mV
110
0.1 1
RL(
10M
`
= 1.5 to 5.2V 60 90 dB
CM
60 80 dB
45 49 %
Zero Duty Cycle 0.7 0.9 V
Max Duty Cycle 3.2 3.6 V
VSD = 0V, VSS = 0V 25 51 80
VSD = 25V 0.3 0.7 V
0.7 1.3 1.7 V
VSD = 2.5V 0.3 1 mA
I
= 20mA 0.1 0.4 V
SINK
I
= 100mA 0.05 2 V
SINK
I
= 20mA 18 19 V
SOURCE
I
= 100mA 17 18 V
SOURCE
V8 and V9 = High 6 7 8 V
VCC = 35V 80 200
CL = 1sF, TJ = 26
CL = 1sF, TJ = 25
Î
Î
80 600 nS
70 300 nS
VCC = 35V 12 20 mA
= 0`)
I
s
A
s
A
0%
s
A
s
A
Page 4
KA3525A SMPS CONTROLLER
TEST CIRCUIT
Page 5
TRADEMARKS
The following are registered and unregistered trademarks Fairchild Semiconductor owns or is authorized to use and is
not intended to be an exhaustive list of all such trademarks.
ACEx™
CoolFET™
CROSSVOLT™
E2CMOS
TM
FACT™
FACT Quiet Series™
®
FAST
FASTr™
GTO™
HiSeC™
ISOPLANAR™
MICROWIRE™
POP™
PowerTrench™
QS™
Quiet Series™
SuperSOT™-3
SuperSOT™-6
SuperSOT™-8
TinyLogic™
UHC™
VCX™
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 APPROV AL OF FAIRCHILD SEMICONDUCTOR CORPORA TION.
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, or (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 significant injury to the
user.
2. A critical component is 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.
PRODUCT STA TUS DEFINITIONS
Definition of Terms
Datasheet Identification Product Status Definition
Advance Information
Preliminary
No Identification Needed
Obsolete
Formative or
In Design
First Production
Full Production
Not In Production
This datasheet contains the design specifications for
product development. Specifications may change in
any manner without notice.
This datasheet contains preliminary data, and
supplementary data will be published at a later date.
Fairchild Semiconductor reserves the right to make
changes at any time without notice in order to improve
design.
This datasheet contains final specifications. Fairchild
Semiconductor reserves the right to make changes at
any time without notice in order to improve design.
This datasheet contains specifications on a product
that has been discontinued by Fairchild semiconductor.
The datasheet is printed for reference information only.
Loading...