Datasheet

LM34910C
SNVS517B –MAY 2007–REVISED MARCH 2013 www.ti.com
Electrical Characteristics (continued)
Specifications with standard typeface are for T
J
= 25°C, and those with boldface type apply over full Operating Junction
Temperature range. V
IN
= 24V, R
ON
= 200k unless otherwise stated
(1)
.
Symbol Parameter Conditions Min Typ Max Units
Softstart Pin
Pull-up voltage 2.5 V
Internal current source 11.5 µA
Current Limit
I
LIM
Threshold Current out of I
SEN
1 1.25 1.5 A
Resistance from I
SEN
to S
GND
130 mΩ
Response time 150 ns
On Timer
t
ON
- 1 On-time V
IN
= 10V, R
ON
= 200 kΩ 2.1 2.75 3.6 µs
t
ON
- 2 On-time V
IN
= 50V, R
ON
= 200 kΩ 560 ns
Shutdown threshold Voltage at R
ON
/SD rising 0.35 0.65 1.1 V
Threshold hysteresis Voltage at R
ON
/SD falling 40 mV
Off Timer
t
OFF
Minimum Off-time 280 ns
Regulation and Over-Voltage Comparators (FB Pin)
V
REF
FB regulation threshold SS pin = steady state 2.440 2.5 2.550 V
FB over-voltage threshold 2.875 V
FB bias current 100 nA
Thermal Shutdown
T
SD
Thermal shutdown temperature 175 °C
Thermal shutdown hysteresis 20 °C
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