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UCC28950PWTR Datasheet(PDF) 3 Page - Texas Instruments

Part # UCC28950PWTR
Description  Green Phase-Shifted Full-Bridge Controller With Synchronous Rectification
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

UCC28950PWTR Datasheet(HTML) 3 Page - Texas Instruments

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UCC28950
www.ti.com
SLUSA16 – MARCH 2010
RECOMMENDED OPERATING CONDITIONS
over operating free-air temperature range (unless otherwise noted)
MIN
TYP
MAX
UNIT
Supply voltage range, VDD
8
12
17
V
Operating junction temperature range
-40
125
°C
Converter switching frequency setting range, FSW(nom)
50
1000
kHz
Programmable delay range between OUTA, OUTB and OUTC, OUTD set by
30
1400
resistors DELAB and DELCD and parameter KA
(1)
ns
Programmable delay range between OUTA, OUTF and OUTB, OUTE set by
30
1400
resistor DELEF, and parameter KEF
(1)
Programmable DCM range as percentage of voltage at CS(1)
5%
30%
Programmable TMIN range
100
800
ns
(1)
Verified during characterization only.
ELECTRICAL CHARACTERISTICS
(1)
VDD = 12 V, TA = TJ = -40°C to 125°C, CVDD = 1 µF, CREF = 1 µF, RAB = 22.6 kΩ, RCD = 22.6 kΩ , REF = 13.3 kΩ, RSUM = 124
k
Ω, RMIN = 88.7 kΩ, RT = 59 kΩ connected between RT pin and 5-V voltage supply to set FSW = 100 kHz (FOSC = 200 kHz)
(unless otherwise noted). All component designations are from the Typical Application Diagram.
PARAMETER
TEST CONDITION
MIN
TYP
MAX
UNITS
Under Voltage Lockout (UVLO)
UVLO_R
Start threshold
6.75
7.3
7.9
TH
UVLO_F
Minimum operating voltage
6.15
6.7
7.2
V
TH
after start
UVLO_H
Hysteresis
0.53
0.6
0.75
YST
Supply Currents
IDD(off)
Startup current
VDD is 5.2 V
150
270
µA
IDD
Operating supply current
5
10
mA
VREF Output Voltage
VREF
VREF total output range
0
≤ IR ≤ 20 mA; VDD = from 8 V to 17 V
4.925
5
5.075
V
ISCC
Short circuit current
VREF = 0 V
-53
-23
mA
Switching Frequency (½ of internal oscillator frequency FOSC)
FSW(nom)
Total range
92
100
108
KHz
DMAX
Maximum duty cycle
95%
97%
Synchronization
RT = 59 k
Ω between RT and GND; Input pulses
PHSYNC
Total range
85
90
95
°PH
200 kHz, D = 0.5 at SYNC
RT = 59 k
Ω between RT and 5 V; -40 °C ≤ TJ
FSYNC
Total range
180
200
220
kHz
125°C
TPW
Pulse width
2.2
2.5
2.8
µs
(1)
Typical values for TA = 25°C
Copyright © 2010, Texas Instruments Incorporated
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