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UC1526AL Scheda tecnica(PDF) 3 Page - Texas Instruments

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Il numero della parte UC1526AL
Spiegazioni elettronici  Regulating Pulse Width Modulator
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Produttore elettronici  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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PARAMETER
TEST CONDITIONS
UC1526A / UC2526A
UC3526A
UNITS
MIN
TYP
MAX
MIN
TYP
MAX
Reference Section (Note 4)
Output Voltage
TJ = +25°C
4.95
5.00
5.05
4.90
5.00
5.10
V
Line Regulation
+VIN = 7 to 35V
2
10
2
15
mV
Load Regulation
IL = 0 to 20mA
5
20
5
20
mV
Temperature Stability
Over Operating TJ (Note 5)
15
50
15
50
mV
Total Output Voltage
Range
Over Recommended Operating
Conditions
4.90
5.00
5.10
4.85
5.00
5.15
V
Short Circuit Current
VREF = 0V
25
50
100
25
50
100
mA
Under-Voltage Lockout
RESET Output Voltage
VREF = 3.8V
0.2
0.4
0.2
0.4
V
VREF = 4.7V
2.4
4.7
2.4
4.8
V
Oscillator Section (Note 6)
Initial Accuracy
TJ = +25°C
±3
±8
±3
±8%
Voltage Stability
+VIN = 7 to 35V
0.5
1
0.5
1
%
Temperature Stability
Over Operating TJ (Note 5)
26
13
%
Minimum Frequency
RT = 150k
Ω, CT = 20µF (Note 5)
1
1
Hz
Maximum Frequency
RT = 2k
Ω, CT = 470pF
550
650
kHz
Sawtooth Peak Voltage
+VIN = 35V
3.0
3.5
3.0
3.5
V
Sawtooth Valley Voltage
+VIN =7V
0.5
1.0
0.5
1.0
V
SYNC Pulse Width
TJ = 25°C, RL = 2.7k
Ω to VREF
1.1
1.1
µs
Error Amplifier Section (Note 7)
Input Offset Voltage
RS
≤ 2kΩ
25
2
10
mV
Input Bias Current
-350
-1000
-350
-2000
nA
Input Offset Current
35
100
35
200
nA
DC Open Loop Gain
RL
≥ 10MΩ
64
72
60
72
dB
HIGH Output Voltage
VPIN 1 - VPIN 2
≥ 150mV, ISOURCE = 100µA
3.6
4.2
3.6
4.2
V
LOW Output Voltage
VPIN 2 - VPIN 1
≥ 150mV, ISINK = 100µA
0.2
0.4
0.2
0.4
V
Common Mode Rejection
RS
≤ 2kΩ
70
94
70
94
dB
Supply Voltage Rejection
+VIN = 12 to 18V
66
80
66
80
dB
PWM Comparator (Note 6)
Minimum Duty Cycle
VCOMPENSATION = +0.4V
0
0
%
Maximum Duty Cycle
VCOMPENSATION = +3.6V
45
49
45
49
%
Digital Ports (SYNC, SHUTDOWN, and RESET)
HIGH Output Voltage
ISOURCE = 40
µA
2.4
4.0
2.4
4.0
V
LOW Output Voltage
ISINK = 3.6mA
0.2
0.4
0.2
0.4
V
HIGH Input Current
VIH = +2.4V
-125
-200
-125
-200
µA
LOW Input Current
VIL = +0.4V
-225
-360
-225
-360
µA
Shutdown Delay
From Pin 8, TJ = 25°C
160
160
ns
Current Limit Comparator (Note 8)
Sense Voltage
RS
≤ 50Ω
90
100
110
80
100
120
mV
Input Bias Current
-3
-10
-3
-10
µA
Shutdown Delay
From pin 7, 100mV Overdrive, TJ = 25°C
260
260
ns
+VIN = 15V, and over operating ambient temperature, unless otherwise specified TA = TJ.
ELECTRICAL CHARACTERISTICS:
Note 4: IL = 0mA.
Note 5: Guaranteed by design, not 100% tested in production.
Note 6: FOSC = 40kHz, (RT = 4.12k
Ω ± 1%, CT = 0.01µF± 1%,
RD = 0
Ω).
Note 7: VCM = 0 to +5.2V
Note 8: VCM = 0 to +12V.
Note 9: VC = +15V.
Note 10:VIN = +35V, RT = 4.12k
Ω.
UC1526A
UC2526A
UC3526A
3


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