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UC2879DWG4 Fiches technique(PDF) 5 Page - Texas Instruments

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No de pièce UC2879DWG4
Description  PHASE SHIFT RESONANT CONTROLLER
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

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(2)
Phase shift percentage (0% = 0 , 100% = 180 ) is defined as
200
%
T
q =
f
UC1879
UC2879
UC3879
SLUS230B – JUNE 1998 – REVISED JUNE 2007
ELECTRICAL CHARACTERISTICS (continued)
Unless specified; VC = VIN = V
UVSEL = 12 V, CT = 470 pF, RT = 9.53k, RDELSETA-B = RDELSEC-D = 4.8k, CDELSETA-B = CDELSETC-D
= 0.01
µF, T
A = TJ.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
PWM Comparator
RAMP offset voltage
TJ = 25°C(1)
1.1
1.25
1.4
V
VCOMP> VRAMPpeak+ VRAMPoffset
98%
99.7%
102%
PWM phase shift,
TDELSETA-B, TDELSETC-D = 0(2)
VCOMP < Zero Phase Shift Voltage
0%
0.3%
2%
VCOMP> VRAMPpeak + VRAMPoffset
10
Output skew,
TDELSETA-B, TDELSETC-D = 0(2)
VCOMP < Zero Phase Shift Voltage
10
ns
UC3879, UC2879
115
250
Ramp to output delay,
TDELSETA-B = 0, TDELSETC-D = 0
UC1879
115
300
Oscillator
Initial accuracy
TA = 25°C
180
200
220
kHz
Voltage stability
11 V < VIN < 18 V
1
2
%
Total variation
Line, Temperature
160
200
240
kHz
CLKSYNC threshold
2.3
2.5
2.7
Clock out high
2.8
4
V
Clock out low
0.5
1
1.5
Clock out pulse width
400
600
ns
Ramp valley voltage
0.2
0.4
V
Ramp peak voltage
2.8
2.9
3.2
Current Limit
Input bias
VCS = 3 V
2
10
µA
Threshold voltage
2.35
2.5
2.65
V
Delay to OUTA, B, C, D
160
300
ns
Cycle-by-Cycle Current Limit
Input bias
VCS = 2.2 V
2
10
µA
Threshold voltage
1.85
2
2.15
V
Delay to output zero phase
110
300
ns
(1)
Ramp offset voltage has a temperature coefficient of about –4 mV/
°C.
where is the phase shift, and and T are defined in Figure 1. At 0% phase shift, is the output skew.
5
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