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UC3525A Datasheet(PDF) 3 Page - Fairchild Semiconductor

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

UC3525A Datasheet(HTML) 3 Page - Fairchild Semiconductor

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UC3525A
3
Electrical Characteristics
(VCC = 20V, TA = 0 to +85°C, unless otherwise specified)
Notes :
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 =0.01uF, RI = 0
Ω)
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Unit
ERROR AMPLIFIER SECTION (VCM = 5.1V)
Input Offset Voltage
VIO
-
-1.5
10
mV
Input Bias Current
IBIAS
-
-1
10
µA
Input Offset Current
IIO
-
-0.1
1
µA
Open Loop Voltage Gain
GVO
RL
≥10MΩ
60
80
-
dB
Common Mode Rejection Ratio
CMRR
VCM = 1.5 to 5.2V
60
90
-
dB
Power Supply Rejection Ratio
PSRR
VCC = 8 to 3.5V
50
60
-
dB
PWM COMPARATOR SECTION
Minimum Duty Cycle
D(MIN)
-
--
0
%
Maximum Duty Cycle
D(MAX)
-
45
49
-
%
Input Threshold Voltage (Note 2)
VTH1
Zero Duty Cycle
0.7
0.9
-
V
Input Threshold Voltage (Note 2)
VTH2
Max Duty Cycle
-
3.2
3.6
V
SOFT-START SECTION
Soft Start Current
ISOFT
VSD = 0V, VSS = 0V
25
51
80
µA
Soft Start Low Level Voltage
VSL
VSD = 25V
-
0.3
0.7
V
Shutdown Threshold Voltage
VTH(SD)
-
0.6
0.8
1
V
Shutdown Input Current
IN(SD)
VSD = 2.5V
-
0.3
1
mA
OUTPUT SECTION
Low Output Voltage I
VOL I
ISINK = 20mA
-
0.1
0.4
V
Low Output Voltage II
VOL II
ISINK = 100mA
-
0.05
2
V
High Output Voltage I
VCH I
ISOURCE = 20mA
18
19
-
V
High Output Voltage II
VCH II
ISOURCE = 100mA
17
18
-
V
Under Voltage Lockout
VUV
V8 and V9 = High
678
V
Collector Leakage Current
ILKG
VCC = 35V
-
80
200
µA
Rise Time (Note 1)
tR
CL = 1uF, TJ = 25
°C
-
80
600
ns
Fall Time (Note 1)
tF
CL = 1uF, TJ = 25
°C
-
70
300
ns
STANDBY CURRENT
Supply Current
ICC
VCC = 35V
-
12
20
mA


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