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UC3825A датащи(PDF) 3 Page - Texas Instruments

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номер детали UC3825A
подробное описание детали  High Speed PWM Controller
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производитель  TI [Texas Instruments]
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UC3825A датащи(HTML) 3 Page - Texas Instruments

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UC1823A,B/1825A,B
UC2823A,B/2825A,B
UC3823A,B/3825A,B
ELECTRICAL CHARACTERISTICS: Unless otherwise stated, these specifications apply for TA = –55°C to +125°C for
the UC1823A,B and UC1825A,B; –40°C to +85°C for the UC2823A,B and UC2825A,B; 0°C to +70°C for the UC3823A,B and
UC3825A,B; RT = 3.65k, CT = 1nF, VCC = 12V, TA =TJ.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
Oscillator Section
Initial Accuracy
TJ = 25°C (Note 1)
375
400
425
kHz
Total Variation
Line, Temperature (Note 1)
350
450
kHz
Voltage Stability
12V < VCC < 20V
1
%
Temperature Stability
TMIN < TA <TMAX (Note 1)
5
%
Initial Accuracy
RT = 6.6k, CT = 220pF, TA = 25°C (Note 1)
0.9
1
1.1
MHz
Total Variation
RT = 6.6k, CT = 220pF (Note 1)
0.85
1.15
MHz
Clock Out High
3.7
4
V
Clock Out Low
0
0.2
V
Ramp Peak
2.6
2.8
3
V
Ramp Valley
0.7
1
1.25
V
Ramp Valley to Peak
1.6
1.8
2
V
Oscillator Discharge Current
RT = Open, VCT = 2V
9
10
11
mA
Error Amplifier Section
Input Offset Voltage
210
mV
Input Bias Current
0.6
3
µA
Input Offset Current
0.1
1
µA
Open Loop Gain
1V < VO < 4V
60
95
dB
CMRR
1.5V < VCM < 5.5V
75
95
dB
PSRR
12V < VCC < 20V
85
110
dB
Output Sink Current
VEAOUT = 1V
1
2.5
mA
Output Source Current
VEAOUT = 4V
–0.5
–1.3
mA
Output High Voltage
IEAOUT = –0.5mA
4.5
4.7
5
V
Output Low Voltage
IEAOUT = 1mA
0
0.5
1
V
Gain Bandwidth Product
F = 200kHz
6
12
MHz
Slew Rate
(Note 1)
6
9
V/
µs
PWM Comparator
RAMP Bias Current
VRAMP = 0V
–1
–8
µA
Minimum Duty Cycle
0%
Maximum Duty Cycle
85
%
Leading Edge Blanking
R = 2k, C = 470pF
300
375
450
ns
LEB Resistor
VCLK/LEB = 3V
8.5
10
11.5
kohm
EAOUT Zero D.C. Threshold
VRAMP = 0V
1.1
1.25
1.4
V
Delay to Output
VEAOUT = 2.1V, VRAMP = 0 to 2V Step (Note 1)
50
80
ns
Current Limit/Start Sequence/Fault Section
Soft Start Charge Current
VSS = 2.5V
8
14
20
µA
Full Soft Start Threshold
4.3
5
V
Restart Discharge Current
VSS = 2.5V
100
250
350
µA
Restart Threshold
0.3
0.5
V
ILIM Bias Current
0 < VILIM < 2V
15
µA
Current Limit Threshold
0.95
1
1.05
V


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