Fairchild Semiconductor KA3525A, KA3525AD Datasheet
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
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
Loading...