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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 reference, an error amplifier, a pulse width modulator, an oscillator, under-voltage lockout, soft start circuit, and output drivers in the chip. 16-DIP
16-SOP-225A
FEATURES
* * * * * 5V Reference Oscillator Sync Terminal Internal Soft Start Deadtime Control Under-Voltage Lockout
a1%
ORDERING INFORMATION
Device KA3525A Package 16 DIP 16-SOP-225A Operating Temperature -30 ~ +85I -30 ~ +85I
BLOCK DIAGRAM
KA3525AD
5.5K
43K
5.5K
Rev. B
(c)1999 Fairchild Semiconductor Corporation
KA3525A
ABSOLUTE MAXIMUM RATINGS
Characteristic Supply Voltage Collector Supply Voltage Output Current, Sink or Source Reference Output Current Oscillator Charging Current Power Dissipation (T A = 25I) Operating Temperature Storage Temperature Lead Temperature (Soldering, 10 sec) Symbol VCC VC IO IREF ICHG(OSC) PD T OPR T STG T LEAD
SMPS CONTROLLER
Value 40 40 500 50 5 1000 0 ~ +70 -65 ~ +150 +300
Unit V V mA mA mA m/W
I I I
ELECTRICAL CHARACTERISTICS
(VCC = 20V, T A = -35I to + 85I, unless otherwise specified) Characteristic REFERENCE SECTION Reference Output Voltage Line Regulation Load Regulation Short Circuit Output Current Total Output Variation (Note 1) Temperature Stability (Note 1) Long Term Stability (Note 1) OSCILLATOR SECTION Initial Accuracy (Note 1, 2) Frequency Change With Voltage Maximum Frequency Minimum Frequency Clock Amplitude (Note 1, 2) Clock Width (Note 1, 2) Sync Threshold Sync Input Current Symbol Test Conditions Min Typ Max Unit
LV LV LV
VREF
REF REF
T J = 25I VCC = 8 to 35V IREF = 0 to 20mA VREF = 0, T J = 25I Line, Load and Temperature T J = 125I, 1 KHRS T J = 25I VCC = 8 to 35V (Note 1, 2) RT = 2K, CT = 470pF RT = 200K, CT = 0.1sF
5.0
5.1 9 20 80
5.2 20 50 100 5.25 50 50
V mV mV mA V mV mV % % KHz Hz
ISC
REF
4.95 20 20
ST T ST ACCUR
CC
Lf/LV
f(MAX) f(MIN)
a3 a0.8
400 3 430 60 4 0.6 2 1.3 0.3 1.2
a6 a2
120 1 2.8 2.5
V(CLK) tW(CLK) VTH(SYNC) II(SYNC) Sync = 3.5V T J = 25I
ss
V mA
V
KA3525A
ELECTRICAL CHARACTERISTICS
(VCC = 20V, T A = -35I to +85I, unless otherwise specified)
SMPS CONTROLLER
Characteristic
Input Offset Voltage Input Bias Current Input Offset Current Open Loop Voltage Gain Common Mode Rejection Ratio Power Supply Rejection Ratio PWM COMPARATOR SECTION Minimum Duty Cycle Maximum Duty Cycle Input Threshold Voltage (Note 2) Input Threshold Voltage (N0te 2) SOFT-START SECTION Soft Start Current Soft Start Low Level Voltage Shutdown Threshold Voltage Shutdown Input Current OUTPUT SECTION Low Output Voltage I Low Output Voltage II High Output Voltage I High Output Voltage II Under Voltage Lockout Collector Leakage Current Rise Time (Note 1) Fall Time (Note 1) STANDBY CURRENT Supply Cuttent
Symbol
VIO IBAIS IIO GVO CMRR PSRR D(MIN) D(MAX) VTH1 VTH2 ISOFT VSL VTH(SD) IN(SD) VOL I VOL II VCH I VCH II VUV ILKG tR tF ICC
Test Conditions
Min
Typ
1.5 1 0.1
Max
10 10 1
Unit
mV
ERROR AMPLIFIER SECTION (VCM = 5.1V)
RL
10M
sA sA
dB dB dB
60 60 50
80 90 60 0
VCM = 1.5 to 5.2V VCC = 8 to 3.5V
% % V
45 Zero Duty Cycle Max Duty Cycle VSD = 0V, VSS = 0V VSD = 25V 0.7 VSD = 2.5V ISINK = 20mA ISINK = 100mA ISOURCE = 20mA ISOURCE = 100mA V8 and V9 = High VCC = 35V CL = 1sF, T J = 26I CL = 1sF, T J = 25I VCC = 35V 18 17 6 25 0.7
49 0.9 3.2 51 0.3 1.3 0.3 0.1 0.05 19 18 7 80 80 70 12 8 200 600 300 20 3.6 80 0.7 1.7 1 0.4 2
V
sA
V V mA V V V V V
sA
nS nS mA
(Note) 1. These parameters. although guaranteed over the recommended operating conditions, are not 100% tested in production 2. Tested at fOSC=40 KHz (RT =3.6K, CT =0.01sF, RI = 0)
KA3525A
SMPS CONTROLLER
TEST CIRCUIT
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.
ACExTM CoolFETTM CROSSVOLTTM E2CMOSTM FACTTM FACT Quiet SeriesTM FAST(R) FASTrTM GTOTM HiSeCTM
DISCLAIMER
ISOPLANARTM MICROWIRETM POPTM PowerTrenchTM QSTM Quiet SeriesTM SuperSOTTM-3 SuperSOTTM-6 SuperSOTTM-8 TinyLogicTM
UHCTM VCXTM
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 FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or 2. A critical component is any component of a life support device or system whose failure to perform can systems which, (a) are intended for surgical implant into be reasonably expected to cause the failure of the life the body, or (b) support or sustain life, or (c) whose support device or system, or to affect its safety or failure to perform when properly used in accordance with instructions for use provided in the labeling, can be effectiveness. reasonably expected to result in significant injury to the user. PRODUCT STATUS DEFINITIONS Definition of Terms Datasheet Identification Advance Information Product Status Formative or In Design Definition 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.
Preliminary
First Production
No Identification Needed
Full Production
Obsolete
Not In Production
This datasheet contains specifications on a product that has been discontinued by Fairchild semiconductor. The datasheet is printed for reference information only.

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