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UCC28250 Datasheet(PDF) 4 Page - Texas Instruments

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Part No. UCC28250
Description  Advanced PWM Controller With Pre-Bias Operation
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

UCC28250 Datasheet(HTML) 4 Page - Texas Instruments

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UCC28250
SLUSA29B – APRIL 2010 – REVISED OCTOBER 2010
www.ti.com
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 = 200 kHz (unless otherwise noted).
PARAMETER
TEST CONDITION
MIN
TYP
MAX
UNITS
Oscillator
Nominal switching frequency
FSW(nom)
at OUTA or OUTB set by RT
RT/SYNC = 75 k
Ω, RSP = 20 kΩ
185
200
215
resistor
kHz
Minimum switching frequency
FSW(min_sync)
at OUTA or OUTB set by
fRT/SYNC = 100 kHz
85
external sync frequency
Maximum switching
frequency at OUTA or OUTB
FSW(max_sync)
fRT/SYNC = 2.5 MHz
1.15
MHz
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
3.22
3.30
3.38
VVREF
Output voltage
V
0 < IREF < 10 mA
3.22
3.30
3.38
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
0.495
0.502
0.509
V
Propagation delay from ILIM
TPDILIM
Exclude leading edge blanking
15
25
36
ns
to OUTA and OUTB outputs
TBLANK
leading edge blanking
40
60
90
ns
Current limit shutdown delay
Measured at HICC pin
55
75
95
timing program current
µA
Hiccup timing program
Measured at HICC pin
2
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
2.3
2.4
2.5
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
4
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Copyright © 2010, Texas Instruments Incorporated
Product Folder Link(s): UCC28250


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