Datasheet

TPS51125
www.ti.com SLUS786G –OCTOBER 2007–REVISED JUNE 2012
ELECTRICAL CHARACTERISTICS (continued)
over operating free-air temperature range, VIN = 12 V (unless otherwise noted)
PARAMETER CONDITIONS MIN TYP MAX UNIT
LOGIC THRESHOLD AND SETTING CONDITIONS
Shutdown 0.4
V
EN0
EN0 setting voltage Enable, VCLK = off 0.8 1.6 V
Enable, VCLK = on 2.4
V
EN0
= 0.2 V 2 3.5 5
I
EN0
EN0 current μA
V
EN0
= 1.5 V 1 1.75 2.5
Shutdown 350 400 450
ENTRIP1, ENTRIP2
V
EN
mV
threshold
Hysteresis 10 30 60
200 kHz/250 kHz 1.5
245 kHz/305 kHz 1.9 2.1
V
TONSEL
TONSEL setting voltage
300 kHz/375 kHz 2.7 3.6
365 kHz/460 kHz 4.7 V
PWM only 1.5
V
SKIPSEL
SKIPSEL setting voltage Auto skip 1.9 2.1
OOA auto skip 2.7
PROTECTION: CURRENT SENSE
I
ENTRIP
ENTRIPx source current V
ENTRIPx
= 920 mV, T
A
= 25°C 9.4 10 10.6 μA
ENTRIPx current temperature
TC
IENTRIP
On the basis of 25°C
(2)
4500 ppm/°C
coefficient
((V
ENTRIPx-GND
/9)-24 mV -V
GND-LLx
) voltage,
V
OCLoff
OCP comparator offset -8 0 8
V
ENTRIPx-GND
= 920 mV
V
OCL(max)
Maximum OCL setting V
ENTRIPx
= 5 V 185 205 225 mV
Zero cross detection
V
ZC
V
GND-LLx
voltage -5 0 5
comparator offset
V
ENTRIP
Current limit threshold V
ENTRIPx-GND
voltage,
(2)
0.515 2 V
PROTECTION: UNDERVOLTAGE AND OVERVOLTAGE
V
OVP
OVP trip threshold OVP detect 110% 115% 120%
t
OVPDEL
OVP prop delay 2 μs
UVP detect 55% 60% 65%
V
UVP
Output UVP trip threshold
Hysteresis 10%
t
UVPDEL
Output UVP prop delay 20 32 40 μs
t
UVPEN
Output UVP enable delay 1.4 2 2.6 ms
UVLO
Wake up 4.1 4.2 4.3
V
UVVREG5
VREG5 UVLO threshold
Hysteresis 0.38 0.43 0.48 V
V
UVVREG3
VREG3 UVLO threshold Shutdown
(2)
VO2-1
THERMAL SHUTDOWN
Shutdown temperature
(2)
150
T
SDN
Thermal shutdown threshold °C
Hysteresis
(2)
10
(2) Ensured by design. Not production tested.
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