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UC2877N Fiches technique(PDF) 5 Page - Texas Instruments

No de pièce UC2877N
Description  Phase Shift Resonant Controller
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

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5
UC1875/6/7/8
UC2875/6/7/8
UC3875/6/7/8
Note 1: Phase shift percentage (0% = 0°, 100% = 180°) is defined as
θ=
200
T
Φ
%, where q is the phase shift, and F and T are de-
fined in Figure 1. At 0% phase shift,
F is the output skew.
Note 2: Delay time is defined as delay = T (1/2–(duty cycle)), where T is defined in Fig. 1.
Note 3: Ramp offset voltage has a temperature coefficient of about –4mV/°C.
Note 4: Zero phase shift voltage has a temperature coefficient of about –2mV/°C.
Note 5: Delay time can be programmed via resistors from the delay set pins to ground. Delay time
62 5 10 12
.
IDELAY
sec. Where
IDELAY =
De lay s e t voltage
RDELAY
The recommended range for IDELAY is 25mA £ IDELAY £ 1mA
Note 6: Ramp delay to output time is defined in Fig. 2.
Note 7: Not production tested at -55°C.
Duty Cycle = t/T
Period = T
TDHL (A to C) = TDHL (B to D) = Φ
Phase Shift, Output Skew & Delay Time Definitions
UDG-95074
Figure 1
Figure 2
UDG-95075
ELECTRICAL CHARACTERISTICS: Unless otherwise stated, –55°C < TA < 125°C for the UC1875/6/7/8, –25°C < TA <
85°C for the UC2875/6/7/8 and 0°C < TA < 70°C for the UC3875/6/7/8, VC = VIN = 12V, RFREQSET = 12kΩ,CFREQSET = 330pF,
RSLOPE = 12kΩ,CRAMP = 200pF, CDELAYSET A-B =CDELAYSET C-D = 0.01µF, IDELAYSET A-B =IDELAYSET C-D = –500µA, TA =TJ.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
Soft-Start/Reset Delay
Charge Current
VSOFTSTART = 0.5V
–20
–9
–3
µA
Discharge Current
VSOFTSTART = 1V
120
230
µA
Restart Threshold
4.3
4.7
V
Discharge Level
300
mV
Output Drivers
Output Low Level
IOUT = 50mA
0.2
0.4
V
IOUT = 500mA
1.2
2.6
V
Output High Level
IOUT = –50mA
1.5
2.5
V
IOUT = –500mA
1.7
2.6
V
Delay Set (UC1875 and UC1876 only)
Delay Set Voltage
IDELAY = –500µA
2.3
2.4
2.6
V
Delay Time, (Note 8)
IDELAY = –250µA (Note 5) (UC3875/6/7/8,
UC2875/6/7/8)
150
250
400
nsec
IDELAY = –250µA (Note 5) (UC1875/6/7/8)
150
250
600
nsec


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