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UC2856QDWR Fiches technique(PDF) 4 Page - Texas Instruments

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No de pièce UC2856QDWR
Description  IMPROVED CURRENT MODE PWM CONTROLLER
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

UC2856QDWR Fiches technique(HTML) 4 Page - Texas Instruments

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(4)
Amplifier gain defined as:
G +
DVCOMP
DVCS)
; DVCS * + 0 V 1 V.
UC2856Q
SGLS265 – NOVEMBER 2004
ELECTRICAL CHARACTERISTICS (continued)
T
A = –40°C to 125°C, VIN = 15 V, RT = 10 kΩ, CT = 1 nF, and TA = TJ (unless otherwise stated)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
ERROR AMPLIFIER SECTION
Input offset voltage
VCM = 2 V
5
mV
Input bias current
–1
µA
Input offset current
500
nA
Common mode range
VIN = 8 V to 40 V
0
VIN–2
V
Open loop gain
VO = 1.2 V to 3 V
80
100
dB
Unity gain bandwidth
TJ = 25°C
1
1.5
MHz
CMRR
VCM = 0 V to 38 V,
VIN = 40 V
75
100
dB
PSRR
VIN = 8 V to 40 V
80
100
dB
Output sink current
VID = -15 mV
VCOMP = 1.2 V
5
10
mA
Output source current
VID = 15 mV
VCOMP = 2.5 V
–0.4
–0.5
mA
High-level output voltage
VID = 50 mV,
RL (COMP) = 15 kΩ
4.3
4.6
4.9
V
Low-level output voltage
VID = –50 mV,
RL (COMP) = 15 kΩ
0.7
1
V
CURRENT SENSE AMPLIFIER SECTION
Amplifier gain
VCS– = 0 V,
CL SS Open(3)(4)
2.5
2.75
3
V/V
Maximum differential input signal (VCS+– VCS–)
CL SS Open 3,
RL (COMP) = 15 kΩ
1.1
1.2
V
Input offset voltage
VCL SS = 0.5 V
COMP open(5)
5
35
mV
CMRR
VCM = 0 V to 3 V
60
dB
PSRR
VIN = 8 V to 40 V
60
dB
Input bias current
VCL SS = 0.5 V,
COMP open(5)
–1
µA
Input offset current
VCL SS = 0.5 V,
COMP open(5)
1
mA
Input common mode range
0
3
V
Delay to outputs
VEA+ = VREF, EA– = 0 V, CS+ – CS– = 0 V to 1.5 V
120
250
ns
CURRENT LIMIT ADJUST SECTION
Current limit offset
VCS– = 0 V, VCS+ = 0 V,
COMP Open(5)
0.4
0.5
0.6
V
Input bias current
VEA+ = VREF,
VEA– = 0 V
–10
–30
µA
SHUTDOWN TERMINAL SECTION
Threshold voltage
0.95
1.00
1.05
V
Input voltage range
0
5
V
Minimum latching current (ICL SS)
(6)3
1.5
mA
Maximum non-latching current (ICL SS)
(7)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
IOUT = 20 mA
0.1
0.5
Output low level voltage
V
IOUT = 200 mA
0.5
2.6
IOUT = –20 mA
12.5
13.2
Output high level voltage
V
IOUT = –200 mA
12
13.1
Rise time
C1 = 1 nF
40
80
ns
Fall time
C1 = 1 nF
40
80
ns
(3)
Parameter measured at trip point of latch with VEA+ = VREF, VEA- = 0 V.
(5)
Parameter measured at trip point of latch with VEA+ = VREF, VEA- = 0 V.
(6)
Current into CL SS assured to latch circuit into shutdown state.
(7)
Current into CL SS assured not to latch circuit into shutdown state.
4


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