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UC1856-SP bảng dữ liệu(PDF) 6 Page - Texas Instruments

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tên linh kiện UC1856-SP
Giải thích chi tiết về linh kiện  Improved Current-Mode PWM Controller
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UC1856-SP
SLUSBV6 – APRIL 2014
www.ti.com
Electrical Characteristics (continued)
Unless otherwise stated, these specifications apply for TA –55°C to +125°C, VIN = 15 V, RT = 10 kΩ, CT = 1 nF, TA = TJ.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
CURRENT LIMIT ADJUST SECTION
Current limit offset
VCS– = 0 V , VCS+ = 0V, COMP = Open
(4)
0.43
0.5
0.57
V
Input bias current
–10
–30
µA
SHUTDOWN PIN SECTION
Threshold voltage
0.95
1
1.05
V
Input voltage range
0
5
V
Minimum latching current (ICL SS)
See (5)
3
1.5
mA
Maximum non-latching current (ICL SS)
See (6)
1.5
0.8
mA
Delay to outputs
VSHUTDOWN = 0 V to 1 .3 V
65
110
ns
OUTPUT SECTION
Collector-emitter voltage
40
V
Off-state bias current
VC = 40 V
250
µA
lOUT = 20 mA
0.1
0.5
Output low level
V
lOUT = 200 mA
0.5
2.6
lOUT = –20 mA
12.5
13.2
Output high level
V
lOUT = –200 mA
12
13.1
Rise time
C1 = 1 nF
40
80
ns
Fall time
C1 = 1 nF
40
80
ns
UVLO low saturation
VIN = 0 V, lOUT = 20 mA
0.8
1.5
V
PWM SECTION
Maximum duty cycle
45%
47%
50%
Minimum duty cycle
0%
UNDERVOLTAGE LOCKOUT SECTION
Startup threshold
7.7
8
V
Threshold hysterisis
0.7
V
TOTAL STANDBY CURRENT
Supply current
18
23
mA
(4)
Parameter measured at trip point of latch with VEA+ = VREF, VEA– = 0 V.
(5)
Current into CL SS ensued to latch circuit into shutdown state.
(6)
Current into CL SS ensured not to latch circuit into shutdown state.
6
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Product Folder Links: UC1856-SP


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