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UC1525B Scheda tecnica(PDF) 3 Page - Texas Instruments

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Il numero della parte UC1525B
Spiegazioni elettronici  Regulating Pulse Width Modulators
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Produttore elettronici  TI [Texas Instruments]
Homepage  http://www.ti.com
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UC1525B Scheda tecnica(HTML) 3 Page - Texas Instruments

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UC1525B UC1527B
UC2525B UC2527B
UC3525B UC3527B
ELECTRICAL CHARACTERISTICS:Unless otherwise stated, these specifications apply for TA = –55°C to +125°C for the
UC1525B and UC1527B; –40°C to +85°C for the UC2525B and UC2527B; 0°C to +70°C for the UC3525B and UC3527B; +VIN =
20V, TA =TJ.
PARAMETER
TEST CONDITIONS
UC1525B/UC2525B
UC1527B/UC2527B
UC3525B
UC3527B
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
Oscillator Section (Note 3)
Initial Accuracy (Notes2&3)
TJ = 25°C
±2
±6
±2
±6
%
Voltage Stability (Notes2&3)
VIN =8Vto35V
±0.3
±1
±1
±2
%
Temperature Stability (Note 2)
Over Operating Range
±3
±6
±3
±6
%
Minimum Frequency
RT = 200k
W,CT=0.1mF
120
120
Hz
Maximum Frequency
RT = 2k
W, CT = 470pF
400
400
kHz
Current Mirror
IRT = 2mA
1.7
2.0
2.2
1.7
2.0
2.2
mA
Clock Amplitude (Notes2&3)
3.0
3.5
3.0
3.5
V
Clock Width (Notes2&3)
TJ = 25°C
0.3
0.5
1.0
0.3
0.5
1.0
ms
Sync Threshold
1.2
2.0
2.8
1.2
2.0
2.8
V
Sync Input Current
Sync Voltage = 3.5V
1.0
2.5
1.0
2.5
mA
Error Amplifier Section (VCM = 5.1V)
Input Offset Voltage
0.5
5
2
10
mV
Input Bias Current
1
10
1
10
mA
Input Offset Current
1
1
mA
DC Open Loop Gain
RL
³ 10 MegW
60
75
60
75
dB
Gain-Bandwidth Product (Note 2)
AV = 0dB, TJ = 25°C
1
2
1
2
MHz
Output Low Level
0.2
0.5
0.2
0.5
V
Output High Level
3.8
5.6
3.8
5.6
V
Common Mode Rejection
VCM = 1.5V to 5.2V
60
75
60
75
dB
Supply Voltage Rejection
VIN = 8V to 35V
50
60
50
60
dB
PWM Comparator
Minimum Duty Cycle
0
0
%
Maximum Duty Cycle (Note 3)
45
49
45
49
%
Input Threshold (Note 3)
Zero Duty Cycle
0.7
0.9
0.7
0.9
V
Input Threshold (Note 3)
Maximum Duty Cycle
3.3
3.6
3.3
3.6
V
Input Bias Current (Note 2)
0.05
1.0
0.05
1.0
mA
Shutdown Section
Soft Start Current
VSHUTDOWN = 0V, VSOFTSTART
=0V
25
50
80
25
50
80
mA
Soft Start Low Level
VSHUTDOWN = 2.5V
0.4
0.7
0.4
0.7
V
Shutdown Threshold
To outputs, VSOFTSTART =
5.1V, TJ =25°C
0.6
0.8
1.0
0.6
0.8
1.0
V
Shutdown Input Current
VSHUTDOWN = 2.5V
0.4
1.0
0.4
1.0
mA
Shutdown Delay (Note 2)
VSHUTDOWN = 2.5V, TJ = 25°C
0.2
0.5
0.2
0.5
ms
Output Drivers (Each Output) (Vc = 20V)
Output Low Level
ISINK = 20mA
0.2
0.4
0.2
0.4
V
ISINK = 100mA
1.0
2.0
1.0
2.0
V
Output HIgh Level
ISOURCE = 20mA
18
19
18
19
V
ISOURCE = 100mA
17
18
17
18
V
Undervoltage Lockout
VCOMP and VSOFTSTART =
High
6
7
8
678
V
Collector Leakage
VC = 35V
200
200
mA


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