Datasheet

TPS40190
www.ti.com SLUS658C –JULY 2005–REVISED JULY 2012
ELECTRICAL CHARACTERISTICS
T
A
= –40°C to 85°C, V
VDD
= 12 V
dc
, T
A
=T
J
, all parameters at zero power dissipation (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
REFERENCE
0°C ≤ T
J
≤ 85°C 585 591 597
V
FB
Feedback voltage range mV
-40°C ≤ T
J
≤ 85°C 582 591 597
INPUT SUPPLY
V
VDD
Input voltage range 4.5 15.0 V
V
ENABLE
= 2.5 V, Outputs switching 2.5 mA
I
VDD
Operating current
V
ENABLE
= 0.6 V 20 μA
ON BOARD REGULATOR
V
5VBP
Output voltage V
VDD
> 6 V, I
5VBP
≤ 10 mA 5.1 5.3 5.5 V
V
DO
Regulator dropout voltage V
VDD
- V
BP5
, V
VDD
= 5 V, I
BP5
≤ 25 mA 270 400 mV
I
SC
Regulator current limit threshold 40 mA
I
BP5
Average current
(1)
40
OSCILLATOR
f
SW
Switching frequency 240 300 360 kHz
V
RMP
Ramp amplitude
(2)
0.75
V
V
VALLEY
Valley voltage
(2)
0.5
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
t
SS
Soft-start time 3.0 4.7 7.0
t
SSDLY
Soft-start delay time
(3)
6 ms
t
REG
Time to regulation 10.5
ERROR AMPLIFIER
GBWP Gain bandwidth product
(2)
5 MHz
A
OL
DC gain
(2)
60 dB
I
IB
Input bias current (current out of FB pin) 100 0 nA
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)
100 140 180
t
OFF
Off-time between restart attempts 25 95 ms
R
COMP(GND)
= OPEN, T
J
= 25°C 256 320 384
V
ILIM
Short circuit comparator threshold voltage R
COMP(GND)
= 4 kΩ, T
J
= 25°C 128 160 192 mV
R
COMP(GND)
= 12 kΩ, T
J
= 25°C 368 460 552
(1) 40 mA is the current available for MOSFET gate drive, the device itself and any external loads. The sum of these must not exceed
40 mA.
(2) Specified by design. Not production tested.
(3) The delay time is the time delay from application of power to the device or from assertion of ENABLE until the output begins to rise.
Copyright © 2005–2012, Texas Instruments Incorporated 3