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UC2856 Fiches technique(PDF) 3 Page - Texas Instruments

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No de pièce UC2856
Description  Improved Current Mode PWM Controller
Download  9 Pages
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

UC2856 Fiches technique(HTML) 3 Page - Texas Instruments

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UC1856
UC2856
UC3856
ELECTRICAL CHARACTERISTICS (cont.) Unless otherwise stated, these specifications apply for TA
= −55°C to
+125
°C for UC1856; − 40°C to +85°C for the UC2856; and 0°C to +70°C for the UC3856, VIN
= 15V, RT = 10k, CT = 1nF, TA = TJ.
UC1856/UC2856
UC3856
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
Oscillator Section (cont.)
Voltage Stability
VIN
= 8V to 40V
2
2
%
Discharge Current
TJ
= 25°C, VCT = 2V
7.5
8.0
8.8
7.5
8.0
8.8
mA
VCT
= 2V
6.7
8.0
8.8
6.7
8.0
8.8
mA
Sync Output High Level
Io
=−1mA
2.4
3.6
2.4
3.6
V
Sync Output Low Level
Io
=+1mA
0.2
0.4
0.2
0.4
V
Sync Input High Level
CT
= 0V, RT = VREF
2.0
1.5
2.0
1.5
V
Sync Input Low Level
CT
= 0V, RT = VREF
1.5
0.8
1.5
0.8
V
Sync Input Current
CT
= 0V, RT = VREF
1
10
1
10
µA
VSYNC
= 5V
Sync Delay to Outputs
CT
= 0V, RT = VREF
50
100
50
100
ns
VSYNC
= 0.8V to 2V
Error Amplifier Section
Input Offset Voltage
VCM
= 2V
5
10
mV
Input Bias Current
−1
−1
µA
Input Offset Current
500
500
nA
Common Mode Range
VIN
= 8V to 40V
0
VIN
− 2
0
VIN
− 2V
Open Loop Gain
Vo
= 1.2V to 3V
80
100
80
100
dB
Unity Gain Bandwidth
TJ
= 25°C
1
1.5
1
1.5
MHz
CMRR
VCM
= 0V to 38V, VIN = 40V
75
100
75
100
dB
PSRR
VIN
= 8V to 40V
80
100
80
100
dB
Output Sink Current
VID
=−15mV, VcOMP = 1.2V
5
10
5
10
mA
Output Source Current
VID
= 15mV, VCOMP
= 2.5V
−0.4
−0.5
−0.4
−0.5
mA
Output High Level
VID
= 50mV, RL (COMP)
= 15k
4.3
4.6
4.9
4.3
4.6
4.9
V
Output Low Level
VID
=−50mV, RL (COMP)
= 15k
0.7
1
0.7
1
V
Current Sense Amplifier Section
Amplifier Gain
VCS
−= 0V, CL SS Open (Notes 3,4)
2.5
2.75
3.0
2.5
2.75
3.0
V/V
Maximum Differential
CL SS Open (Note 3)
1.1
1.2
1.1
1.2
V
Input Signal (VCS+
− Vcs-)
RL (COMP)
= 15k
Input Offset Voltage
VCL SS
= 0.5V
5
35
5
35
mV
COMP Open (Note 3)
CMRR
VCM
= 0V to 3V
60
60
dB
PSRR
VIN
= 8V to 40V
60
60
dB
Input Bias Current
VCL SS
= 0.5V, COMP Open (Note 3)
−1
−3
−1
−3
µA
Input Offset Current
VCL SS
= 0.5V, COMP Open (Note 3)
1
1
mA
Input Common Mode Range
0
3
0
3
V
Delay to Outputs
VEA+
= VREF, EA−= 0V
120
250
120
250
ns
CS+
− CS−= 0V to 1.5V
Current Limit Adjust Section
Current Limit Offset
VCS- = 0V
0.43
0.5
0.57
0.43
0.5
0.57
V
VCS+ = 0V, COMP = Open (Note 3)
Input Bias Current
VEA+
= VREF, VEA−= 0V
−10
−30
−10
−30
µA
Shutdown Terminal Section
Threshold Voltage
0.95
1.00
1.05
0.95
1.00
1.05
V
Input Voltage Range
0
5
0
5
V


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