Datasheet

TPS40195
SLUS720E –FEBRUARY 2007–REVISED JULY 2012 www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
T
J
= –40°C to 85°C, V
VDD
= 12 V
dc
, all parameters at zero power dissipation (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
PWM
D
MAX
Maximum duty cycle
(2)
85%
t
ON(min)
Minimum controlled pulse
(2)
130
HDRV off to LDRV on 50 ns
t
DEAD
Output driver dead time
LDRV off to HDRV on 25
SOFT-START
V
SS_SEL
= 0 V, f
SW
= 250 kHz 4.8
V
SS_SEL
= 0 V, f
SW
= 500 kHz 2.4
V
SS_SEL
= Floating, f
SW
= 250 kHz 2.4
t
SS
Soft-start time ms
V
SS_SEL
= Floating, f
SW
= 500 kHz 1.2
V
SS_SEL
= V
BP
, f
SW
= 250 kHz 1.2
V
SS_SEL
= V
BP
, f
SW
= 500 kHz 0.6
ERROR AMPLIFIER
GBWP Gain bandwidth product
(2)
7 10 MHz
A
OL
DC gain
(2)
60 dB
Input bias current (current out of FB
I
FB
100 nA
pin)
I
EAOP
Output source current V
FB
= 0 V 1
mA
I
EAOM
Output sink current V
FB
= 2 V 1
SHORT CIRCUIT PROTECTION
t
PSS(min)
Minimum pulse during short circuit
(2)
250
ns
t
BLNK
Blanking time
(2)
60 90 120
t
OFF
Off-time between restart attempts 40 ms
I
ILIM
ILIM pin bias current T
J
= 25°C 7 9 11 μA
V
ILIMOFST
Low side comparator offset voltage -20 0 20 mV
Short circuit threshold voltage on high-
V
ILIMH
T
J
= 25°C 400 550 650 mV
side MOSFET
OUTPUT DRIVERS
R
HDHI
High-side driver pull-up resistance V
BOOT
- V
SW
= 4.5 V, I
HDRV
= -100 mA 3 6
R
HDLO
High-side driver pull-down resistance V
BOOT
- V
SW
= 4.5 V, I
HDRV
= 100 mA 1.5 3.0
Ω
R
LDHI
Low-side driver pull-up resistance I
LDRV
= -100 mA 2.5 5.0
R
LDLO
Low-side driver pull-down resistance I
LDRV
= 100 mA 0.8 1.5
t
HRISE
High-side driver rise time
(2)
15 35
t
HFALL
High-side driver fall time
(2)
10 25
C
LOAD
= 1 nF ns
t
LRISE
Low-side driver rise time
(2)
15 35
t
LFALL
Low-side driver fall time
(2)
10 25
UVLO
V
UVLOBP
BP5 UVLO threshold voltage 3.9 4.1 4.3 V
V
UVLOBPH
BP5 UVLO hysteresis voltage 800 mV
V
UVLO
Turn-on voltage 1.125 1.26 1.375 V
I
UVLO
UVLO pin hysteresis current V
UVLO
= 1.375 V 5.2 μA
SHUTDOWN
V
IH
High-level input voltage, EN 1.9 3
V
V
IL
Low-level input voltage, EN 0.6
POWER GOOD
(2) Specified by design. Not production tested.
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