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UC3525A Datasheet(PDF) 2 Page - Fairchild Semiconductor

Part No. UC3525A
Description  SMPS Controller
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Maker  FAIRCHILD [Fairchild Semiconductor]
Homepage  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

UC3525A Datasheet(HTML) 2 Page - Fairchild Semiconductor

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UC3525A
2
Absolute Maximum Ratings
Electrical Characteristics
(VCC = 20V, TA = -30°C to + 85°C, unless otherwise specified)
Parameter
Symbol
Value
Unit
Supply Voltage
VCC
40
V
Collector Supply Voltage
VC
40
V
Output Current, Sink or Source
IO
500
mA
Reference Output Current
IREF
50
mA
Oscillator Charging Current
ICHG(OSC)
5mA
Power Dissipation (TA = 25
°C)
PD
1000
m/W
Operating Temperature
TOPR
0 ~ +70
°C
Storage Temperature
TSTG
-65 ~ +150
°C
Lead Temperature (Soldering, 10 sec)
TLEAD
+300
°C
Parameter
Symbol
Conditions
Min.
Typ. Max.
Unit
REFERENCE SECTION
Reference Output Voltage
VREF
TJ = 25
°C
5.0
5.1
5.2
V
Line Regulation
∆VREF
VCC = 8 to 35V
-
9
20
mV
Load Regulation
∆VREF
IREF = 0 to 20mA
-
20
50
mV
Short Circuit Output Current
ISC
VREF = 0, TJ = 25
°C
-
80
100
mA
Total Output Variation (Note 1)
∆VREF
Line, Load and Temperature
4.95
-
5.25
V
Temperature Stability (Note 1)
STT
-
-20
50
mV
Long Term Stability (Note 1)
ST
TJ = 125
°C ,1 KHRS
-20
50
mV
OSCILLATOR SECTION
Initial Accuracy (Note 1, 2)
ACCUR
TJ = 25
°C-
± 3
± 6%
Frequency Change With Voltage
∆f/∆VCC
VCC = 8 to 35V (Note 1, 2)
-
± 0.8 ± 2%
Maximum Frequency
f(MAX)
RT = 2K
Ω, CT = 470pF
400
430
-
KHz
Minimum Frequency
f(MIN)
RT = 200K
Ω, CT = 0.1uF
-
60
120
Hz
Clock Amplitude (Note 1, 2)
V(CLK)
-
34
-
V
Clock Width (Note 1, 2)
tW(CLK)
TJ = 25
°C0.3
0.6
1
µs
Sync Threshold
VTH(SYNC)
-
1.222.8
V
Sync Input Current
II(SYNC)
Sync = 3.5V
-
1.3
2.5
mA


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