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UCC28251 Datasheet(PDF) 7 Page - Texas Instruments

Part No. UCC28251
Description  UCC28251 Advanced PWM Controller With Prebias Operation
Download  55 Pages
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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UCC28251 Datasheet(HTML) 7 Page - Texas Instruments

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UCC28251
www.ti.com
SLUSBD8E – FEBRUARY 2013 – REVISED DECEMBER 2014
Electrical Characteristics
(1) (continued)
VDD = 12 V, 1-µF capacitor from VDD and VREF to GND, TA = TJ = –40°C to 125°C, RT = 75 kΩ connected to ground to set
FSW = 100 kHz (unless otherwise noted).
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
OSCILLATOR
Nominal switching frequency
FSW(nom)
at OUTA or OUTB set by RT
RT/SYNC = 75 k
Ω, RSP = 20 kΩ
90
98
106
resistor
Minimum switching frequency
FSW(min_sync)
at OUTA or OUTB set by
fRT/SYNC = 50 kHz
42
kHz
external sync frequency
Maximum switching
frequency at OUTA or OUTB
FSW(max_sync)
fRT/SYNC = 2.5 MHz
945
set by external sync
frequency
External synchronization
1
signal high
V
External synchronization
0.2
signal low
VOLTAGE REFERENCE
VDD = from 7 V to 17 V, IVREF = 2 mA
3.17
3.25
3.33
VVREF
Output voltage
V
0 < IREF < 10 mA
3.17
3.25
3.33
Short circuit current
VREF = 3 V, TJ = 25 °C
12
25
40
mA
CURRENT SENSE, CYCLE-BY-CYCLE CURRENT LIMIT WITH HICCUP
VILIM
ILIM cycle-by-cycle threshold
0.497
0.505
0.513
V
Exclude leading edge blanking (UCC28251RGP)
15
25
36
Propagation delay from ILIM
TPDILIM
to OUTA and OUTB outputs
Exclude leading edge blanking (UCC28251PW)
12.3
25.0
38.7
ns
TBLANK
Leading edge blanking
35
60
90
Current limit shutdown delay
Measured at HICC pin
55
75
95
timing program current
µA
Hiccup timing program
Measured at HICC pin
2.0
2.7
3.5
current
Current limit shutdown delay
VHICC_SD
0.55
0.60
0.65
timer threshold at HICC
VHICC_PU
HICC pull-up threshold
2.25
2.40
2.50
V
VHICC_RST
Hiccup restart threshold
0.25
0.30
0.35
10-V ramp charging voltage source with 40-k
Ω
VCS(max)
RAMP/CS clamp voltage
3.5
4.0
4.5
current limiting resistor
Copyright © 2013–2014, Texas Instruments Incorporated
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