Datasheet

UCC28250
www.ti.com SLUSA29C –APRIL 2010– REVISED JULY 2011
RECOMMENDED OPERATING CONDITIONS
over operating free-air temperature range (unless otherwise noted)
MIN TYP MAX UNIT
Supply voltage range, V
DD
4.7 12 17 V
Supply bypass capacitor, C
VDD
1
µF
VREF bypass capacitor 0.5 2
Error amplifier input common mode range (REF/EA+, FB/EA-) 0 3.0
V
VSENSE input voltage range 0 3.3
RT resistor range 12.5 200
kΩ
PS, SP resistor range 5 250
RAMP/CS voltage range 0 2.7 V
Operating junction temperature range -40 150 °C
ELECTRICAL CHARACTERISTICS
(1)
VDD = 12 V, 1-µF capacitor from VDD and VREF to GND, T
A
= T
J
= -40°C to 125°C, RT = 75 kΩ connected to ground to set
F
SW
= 200 kHz (unless otherwise noted).
PARAMETER TEST CONDITION MIN TYP MAX UNITS
Supply Currents
I
DD(off)
Startup current VDD = 3.6 V 150 275 µA
I
DD
Operating supply current 100-pF capacitor on OUTA, OUTB, SRA and SRB 2.0 2.7 3.4 mA
I
DD(dis)
Standby current EN = 0 V 250 425 600 µA
Under Voltage Lockout
V
UVLOR
Start threshold 4.0 4.3 4.6
Minimum operating voltage
V
UVLOF
3.8 4.1 4.4 V
after start
Hysteresis 0.15 0.20 0.25
Soft Start
I
SS
Soft-start charge current V
SS
= 0 V 25 27 29 µA
V
SS(max)
Clamp voltage 3.3 3.6 4.0 V
Enable
(2)
Trigger threshold 2.25 V
Minimum pulse width for
3 µs
pulse enable
Error Amplifier
High-level COMP voltage 2.8 3
V
Low-level COMP voltage 0.3 0.4
Input offset -12 12 mV
Open loop gain 70 100 dB
I
COMP(snk)
COMP sink current 3.0 6.5 9.0
mA
I
COMP(src)
COMP source current 2.0 4.5 8.0
(1) Typical values for T
A
= 25°C.
(2) Refer to EN pin description.
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