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UC2855ADWG4 Fiches technique(PDF) 3 Page - Texas Instruments

No de pièce UC2855ADWG4
Description  High Performance Power Factor Preregulator
Download  17 Pages
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

UC2855ADWG4 Fiches technique(HTML) 3 Page - Texas Instruments

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3
UC2855A/B
UC3855A/B
ELECTRICAL CHARACTERISTICS:Unless otherwise specified: VCC = 18V, RVS = 23k, CT = 470pF, CI = 150pF, VRMS
= 1.5V, IAC = 100
µA, ISENSE = 0V, CAO = 4V, VAOUT= 3.5V, VSENSE = 3V. –40°C to 85°C (UC2855A/B), 0°Cto70°C
(UC3855A/B).
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
Current Amplifier
Input Offset Voltage
VCM = − 2.5V
−44
mV
Input Bias Current (Sense)
VCM = 2.5V
−500
500
nA
Open Loop Gain
VCM = 2.5V, VOUT =2to6V
80
110
dB
VOUT High
ILOAD = −500µA6
V
VOUT Low
ILOAD = 500µA
0.3
0.5
V
Output Short Circuit Current
VOUT =0V
1
3
mA
Common Mode Range
−0.3
5
V
Gain Bandwidth Product
FIN = 100kHz, 10mV, P–P, TA = 25°C
2.5
5
MHz
Reference
Output Voltage
IREF = 0mA, TA = 25°C
7.388
7.5
7.613
V
IREF = 0mA
7.313
7.5
7.688
V
Load Regulation
IREF =1to10mA
−15
15
mV
Line Regulation
VCC = 15 to 35V
−10
10
mV
Short Circuit Current
REF = 0V
20
45
65
mA
Oscillator
Initial Accuracy
TA =25°C
170
200
230
kHz
Voltage Stability
VCC =12to18V
1
%
Total Variation
Line, Temp.
160
240
kHz
Ramp Amplitude (P–P)
Outputs at 0% duty cycle
4.7
5.7
V
Ramp Valley Voltage
1.1
1.6
V
Enable/OVP/Current Limit
Enable Threshold
1.8
2.2
V
OVP Threshold
7.5
7.66
V
OVP Hysteresis
200
400
600
mV
OVP Propagation Delay
200
ns
OVP Input Bias Current
V= 7.5V
1
10
µA
PKLIMIT Threshold
1.25
1.5
1.75
V
PKLIMIT Input Current
VPKLIMIT = 1.5V
100
µA
PKLIMIT Prop. Delay
100
ns
Soft Start
Soft Start Charge Current
-10
-13
-20
mA
Soft Start Discharge Current
2
10
20
mA
Multiplier
Output Current - IAC Limited
IAC = 100
µA, VRMS = 1V
−235
−205
−175
µA
Output Current - Zero
IAC = 0
µA
−2
−0.2
2
µA
Output Current - Power Limited
VRMS = 1.5V, VAOUT = 5.5V
−250
−209
−160
µA
Output Current
VRMS = 1.5V, VAOUT = 2V
−26
µA
VRMS = 1.5V VAOUT = 5V
−190
µA
VRMS = 5V, VAOUT = 2V
−3
µA
VRMS = 5V, VAOUT = 5V
−17
µA
Gain Constant
Refer to Note 1
−0.95 −0.85 −0.75
1/V


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