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UC1874-1 датащи(PDF) 3 Page - Texas Instruments

номер детали UC1874-1
подробное описание детали  High Efficiency, Synchronous, Step-down (Buck) Controllers
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UC1874-1 датащи(HTML) 3 Page - Texas Instruments

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UC1874-1,-2
UC2874-1,-2
UC3874-1,-2
ELECTRICAL CHARACTERISTICS: Unless otherwise stated these specifications apply for TA = –55°C to +125°C for
UC1874; TA = –25°C to +85°C for UC2874; 0°C to +70°C for UC3874; VCC = 12V, Ct = 680pF, CCAP =1
µF; CBOOT = 0.1µF;
TA =TJ.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
Overall Section
Supply Current, Sleep
SOFTSTART = 0V; TA=25°C
30
75
µA
Supply Current, Operating
8.5
12
mA
Supply Current, Standby
UC2874-1, -2, UC3874-1, -2
2.5
3.5
mA
Supply Current, Standby
UC1874-1, -2
5.5
mA
VCC Turn-on Threshold
UCX874-2
10
10.5
V
UCX874-1
4.5
4.8
V
VCC Turn-off Threshold
UCX874-2
8.5
9
V
UCX874-1
4.1
4.4
V
Voltage Amplifier Section
Input Voltage
TA = 25°C
1.97
2
2.03
V
VSNS Bias Current
–500
25
500
nA
Transconductance
ICOMp = +10
µAto–10µA, UC3874 -1, -2;
UC2874-1, -2
400
675
1000
µMho
Transconductance
ICOMp=+5
µAto–5µA, UC1874-1,-2
250
675
1250
µMho
VOUT High
2.9
3.1
3.25
V
VOUT Low
SB = VREF
1.85
V
Output Source Current
VOUT = 1V; UC3874-1,-2; UC2874-1,-2
10
35
µA
VOUT = 1V; UC1874 -1,-2
5
35
µA
Current Amplifier Section
Input Offset Voltage
VCOMP = 2.5V
–6
0
6
mV
Input Bias Current (SENSE)VCM = 2.5V
–500
500
nA
Open Loop Gain
VCM = 2.5V, VOUT = 1V to 3.5V
80
110
dB
VOUT High
RCAOUT = 100k to GND, TA = 25°C
3.6
3.7
V
VOUT Low
RCAOUT = 100k to VREF, TA = 25°C
0.7
0.86
V
Output Source Current
VOUT = 0V, TA = 25°C
80
100
120
µA
Common Mode REJ Ratio
VCM = 2V to 3V
70
90
dB
Gain Bandwidth Product
FIN = 100kHz, 10mV p-p
2
3.5
MHz
Reference Section
Output Voltage
IREF = 0mA, TA = 25°C
2.462
2.5
2.538
V
IREF = 0mA
2.437
2.5
2.563
V
Load Regulation
IREF = 0mA to 5mA
2
± 15
mV
Line Regulation
VCC = 12V to 24V
2
± 15
mV
Short Circuit Current
VREF = 0V
10
20
25
mA
Oscillator Section
Initial Accuracy
TA = 25°C
85
100
115
kHz
Voltage Stability
VCC = 12V to 18V
1
1.5
%
Total Variation
Line, Temperature
80
120
kHz
Ramp Amplitude (p-p)
TA = 25°C
2.48
2.7
2.85
V
Ramp Valley Voltage
TA = 25°C
0.86
0.95
V
Sleep/Soft Start/Bootstrap Section
Sleep Threshold
Measured on SS, TA = 25°C
0.25
0.6
0.8
V
SS Charge Current
VSS = 2.5V
4
6
10
µA


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