Datasheet

TPS40170
SLUS970A –MARCH 2011–REVISED NOVEMBER 2013 www.ti.com
ELECTRICAL CHARACTERISTICS
Unless otherwise stated, these specifications apply for -40ºC ≤ T
J
≤ 125ºC, V
VIN
=12 V
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
INPUT SUPPLY
V
VIN
Input voltage range 4.5 60 V
I
SD
Shutdown current V
ENABLE
< 100 mV 1 2.5 µA
I
QQ
Operating current, drivers not switching V
ENABLE
≥ 2 V, f
SW
= 300 kHz 4.5 mA
ENABLE
V
DIS
ENABLE pin voltage to disable the device 100 mV
V
EN
ENABLE pin voltage to enable the device 600 mV
I
ENABLE
ENABLE pin source current 300 nA
8-V AND 3.3-V REGULATORS
V
ENABLE
≥ 2 V, 8.2 V < V
VIN
≤ 60 V,
V
VBP
8-V regulator output voltage 7.8 8.0 8.3 V
0 mA < I
IN
< 20 mA
8-V regulator dropout voltage, 4.5 < V
VIN
≤ 8.2 V, V
EN
≥ 2.0 V,
V
DO
110 200 mV
V
VIN-VVBP
I
IN
= 10 mA
V
ENABLE
≥ 2 V, 4.5 V < V
VIN
≤ 60 V,
V
VDD
3.3-V regulator output voltage 3.22 3.30 3.42 V
0 mA < I
IN
< 5 mA
FIXED AND PROGRAMMABLE UVLO
Programmable UVLO ON voltage (at UVLO
V
UVLO
V
ENABLE
≥ 2 V 878 900 919 mV
pin)
I
UVLO
Hysteresis current out of UVLO pin V
ENABLE
≥ 2 V , UVLO pin > V
UVLO
4.06 5.00 6.20 µA
VBP
ON
VBP turn-on voltage 3.85 4.40
V
VBP
OFF
VBP turn-off voltage V
ENABLE
≥ 2 V, UVLO pin > V
UVLO
3.60 4.05
VBP
HYS
VBP UVLO Hysteresis voltage 180 400 mV
REFERENCE
T
J
= 25°C, 4.5 V < V
VIN
≤ 60 V 594 600 606
Reference voltage (+ input of the error
V
REF
mV
amplifier)
–40°C ≤ T
J
≤ 125ºC, 4.5 V < V
VIN
≤ 60 V 591 600 609
OSCILLATOR
Range (typical) 100 600
R
RT
= 100 kΩ, 4.5 V <V
VIN
≤ 60 V 90 100 110
f
SW
Switching frequency kHz
R
RT
= 31.6 kΩ, 4.5 V <V
VIN
≤ 60 V 270 300 330
R
RT
= 14.3 kΩ, 4.5 V <V
VIN
≤ 60 V 540 600 660
V
VALLEY
Valley voltage 0.7 1 1.2 V
K
PWM
(1)
PWM Gain (V
VIN
/ V
RAMP
) 4.5 V < V
VIN
≤ 60 V 14 15 16 V/V
PWM AND DUTY CYCLE
V
VIN
= 4.5 V, f
SW
= 300 kHz 100 150
t
ON(min)
(1)
Minimum controlled pulse V
VIN
= 12 V, f
SW
= 300 kHz 75 100 ns
V
VIN
= 60 V, f
SW
= 300 kHz 50 80
t
OFF(max)
(1)
Minimum OFF time V
VIN
= 12V, f
SW
= 300 kHz 170 250 ns
f
SW
= 100 kHz, 4.5 V < V
VIN
≤ 60 V 95%
D
MAX
(1)
Maximum duty cycle F
SW
= 300 kHz, 4.5 V < V
VIN
≤ 60 V 91%
f
SW
= 600 kHz, 4.5 V < V
VIN
≤ 60 V 82%
(1) Specified by design. Not production tested.
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