Datasheet

LM34923
SNVS695A –MARCH 2011–REVISED FEBRUARY 2013 www.ti.com
Electrical Characteristics (continued)
Specifications with standard type are for T
J
= 25°C only; limits in boldface type apply over the full Operating Junction
Temperature (T
J
) range. Minimum and Maximum limits are specified through test, design, or statistical correlation. Typical
values represent the most likely parametric norm at T
J
= 25°C, and are provided for reference purposes only. Unless
otherwise stated the following conditions apply: VIN = 48V
(1)
.
Symbol Parameter Conditions Min Typ Max Unit
Current Limit
Current Limit Threshold 700 1175 1500 mA
Current Limit Response Time I
switch
= 1.24A, Time to Switch Off 190 ns
T
OFF-1
OFF time generator (test 1) FB=0V, VIN = 75V 37 µs
T
OFF-2
OFF time generator (test 2) FB=2.3V, VIN = 75V 7.2 µs
T
OFF-3
OFF time generator (test 3) FB=0V, VIN = 10V 5.7 µs
T
OFF-4
OFF time generator (test 4) FB=2.3V, VIN = 10V 1.25 µs
On Time Generator
T
ON
- 1 On-Time Vin = 10V 2.2 3.3 4.51 µs
Ron = 250K
T
ON
- 2 On-Time Vin = 75V 300 450 565 ns
Ron = 250K
Remote Shutdown Threshold Voltage at RT/SD rising 0.46 0.9 1.4 V
Remote Shutdown Hysteresis 60 mV
Minimum Off Time
Minimum Off Time VIN = 6V 260 347 ns
Regulation and OV Comparators
FB Reference Threshold Internal reference 2.4365 2.5 2.5625 V
Trip point for switch ON
FB Over-Voltage Threshold Trip point for switch OFF 2.85 V
FB Bias Current 1 nA
Under Voltage Sensing
UV
TH
UV Threshold 2.4 2.5 2.6 V
UV
HYS
UV Hysteresis Current UV = 2V 2.7 5 7.3 µA
UV
BIAS
UV Bias Current UV = 3V 1 nA
UVO
VOL
UVO Output Low Voltage UV = 3V, I
UVO
= 5mA 360 600 mV
UVO
IOH
UVO Leakage Current UV = 2V, V
UVO
= 7.8V 1 nA
Thermal Shutdown
Tsd Thermal Shutdown Temp. 165 °C
Thermal Shutdown Hysteresis 20 °C
Thermal Resistance
θ
JA
Junction to Ambient VSSOP Package 200 °C/W
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