參數(shù)資料
型號： UC3874J-1
廠商： Texas Instruments, Inc.
英文描述： High Efficiency, Synchronous, Step-down Buck Controllers
中文描述： 高效率，同步，降壓降壓控制器
文件頁數(shù)： 3/10頁
文件大小： 350K
代理商： UC3874J-1
3
UC1874-1,-2
UC2874-1,-2
UC3874-1,-2
ELECTRICAL CHARACTERISTICS:
Unless otherwise stated these specifications apply for T
A
= –55°C to +125°C for
UC1874; T
A
= –25°C to +85°C for UC2874; 0°C to +70°C for UC3874; VCC = 12V, Ct = 680pF, C
CAP
= 1 F; C
BOOT
= 0.1 F;
T
A
= T
J
.
PARAMETER
TEST CONDITIONS
Overall Section
Supply Current, Sleep
SOFTSTART = 0V; TA=25°C
Supply Current, Operating
Supply Current, Standby
UC2874-1, -2, UC3874-1, -2
Supply Current, Standby
UC1874-1, -2
V
CC
Turn-on Threshold
UCX874-2
UCX874-1
V
CC
Turn-off Threshold
UCX874-2
UCX874-1
Voltage Amplifier Section
Input Voltage
T
A
= 25°C
VSNS Bias Current
Transconductance
I
COM
p = +10 A to –10 A, UC3874 -1, -2;
UC2874-1, -2
Transconductance
I
COM
p = +5 A to –5 A, UC1874-1,-2
V
OUT
High
V
OUT
Low
SB = VREF
Output Source Current
V
OUT
= 1V; UC3874-1,-2; UC2874-1,-2
V
OUT
= 1V; UC1874 -1,-2
Current Amplifier Section
Input Offset Voltage
V
COMP
= 2.5V
Input Bias Current (
SENSE
)
V
CM
= 2.5V
Open Loop Gain
V
CM
= 2.5V, V
OUT
= 1V to 3.5V
V
OUT
High
R
CAOUT
= 100k to GND, T
A
= 25°C
V
OUT
Low
R
CAOUT
= 100k to VREF, T
A
= 25°C
Output Source Current
V
OUT
= 0V, T
A
= 25°C
Common Mode REJ Ratio
VCM = 2V to 3V
Gain Bandwidth Product
F
IN
= 100kHz, 10mV p-p
Reference Section
Output Voltage
I
REF
= 0mA, T
A
= 25°C
I
REF
= 0mA
Load Regulation
I
REF
= 0mA to 5mA
Line Regulation
VCC = 12V to 24V
Short Circuit Current
VREF = 0V
Oscillator Section
Initial Accuracy
T
A
= 25°C
Voltage Stability
V
CC
= 12V to 18V
Total Variation
Line, Temperature
Ramp Amplitude (p-p)
T
A
= 25°C
Ramp Valley Voltage
T
A
= 25°C
Sleep/Soft Start/Bootstrap Section
Sleep Threshold
Measured on SS, T
A
= 25°C
SS Charge Current
V
SS
= 2.5V
SS Discharge Current
V
SS
= 2.5V
MIN
TYP
MAX
UNITS
30
8.5
2.5
75
12
3.5
5.5
10.5
4.8
A
mA
mA
mA
V
V
V
V
10
4.5
9
4.4
8.2
4.1
1.97
–500
400
2
2.03
500
1000
V
nA
Mho
25
675
250
2.8
675
3.1
1250
3.25
1.85
Mho
V
V
A
A
10
5
35
35
–6
0
6
mV
nA
dB
V
V
A
dB
MHz
–500
80
3.6
500
110
3.7
0.7
100
90
3.5
0.86
120
80
70
2
2.462
2.437
2.5
2.5
2
2
20
2.538
2.563
±
15
±
15
25
V
V
mV
mV
mA
10
85
100
1
115
1.5
120
2.85
kHz
%
kHz
V
V
80
2.48
0.86
2.7
0.95
0.25
4
0.5
0.6
6
0.8
0.8
10
V
A
mA
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