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UCC28251 Datasheet(PDF) 6 Page - Texas Instruments

Part No. UCC28251
Description  UCC28251 Advanced PWM Controller With Prebias Operation
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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UCC28251 Datasheet(HTML) 6 Page - Texas Instruments

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UCC28251
SLUSBD8E – FEBRUARY 2013 – REVISED DECEMBER 2014
www.ti.com
7.4 Thermal Information
UCC28251
THERMAL METRIC(1)
RGP
PW
UNIT
20 PINS
20 PINS
RθJA
126 with hot
60.3 with hot
spot,
spot,
Junction-to-ambient thermal resistance
104 without hot
39.3 without hot
spot
spot
°C/W
RθJC(top)
Junction-to-case (top) thermal resistance
N/A
31.5
RθJB
Junction-to-board thermal resistance
N/A
55.8
RθJC(bot)
Junction-to-case (bottom) thermal resistance
0.8
N/A
(1)
For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.
7.5 Electrical Characteristics
(1)
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
SUPPLY CURRENTS
IDD(off)
Startup current
VDD = 3.6 V
150
275
µA
IDD
Operating supply current
100-pF capacitor on OUTA, OUTB, SRA and SRB
1.2
2.0
2.5
mA
IDD(dis)
Standby current
EN = 0 V
250
425
600
µA
UNDERVOLTAGE LOCKOUT
VUVLOR
Start threshold
4.00
4.30
4.65
Minimum operating voltage
VUVLOF
3.8
4.1
4.4
V
after start
Hysteresis
0.15
0.20
0.25
SOFT-START
ISS
Soft-start charge current
VSS = 0 V
26
28
30
µA
VSS(max)
Clamp voltage
3.3
3.6
4.0
V
ENABLE(2)
Trigger threshold
1.5
2.0
2.25
V
Minimum pulse width for
3.2
µs
pulse enable
ERROR AMPLIFIER
High-level COMP voltage
2.8
3
V
Low-level COMP voltage
0.3
0.4
Input offset
–16.2
18.0
mV
Open loop gain
70
100
dB
ICOMP(snk)
COMP sink current
3.0
6.5
9.0
mA
ICOMP(src)
COMP source current
2.0
4.5
8.0
(1)
Typical values for TA = 25 °C.
(2)
Refer to EN pin description.
6
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Copyright © 2013–2014, Texas Instruments Incorporated
Product Folder Links: UCC28251


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