Datasheet

LM5071
SNVS409E –NOVEMBER 2005–REVISED APRIL 2013 www.ti.com
Electrical Characteristics
(1)
(continued)
Specifications in standard type face are for T
J
= +25°C and those in boldface type apply over the full operating junction
temperature range. Unless otherwise specified: V
IN
= 48V, V
CC
= 10V, RT = 30.3kΩ.
Symbol Parameter Conditions Min Typ Max Units
Leading Edge Blanking Time 55 ns
CS Sink Impedance (clocked) 25 55 Ω
Soft-Start
Softstart Current Source 7 10 13 uA
Oscillator
(4)
Frequency1 175 200 225 KHz
(RT = 30.3K)
Frequency2 505 580 665 KHz
(RT = 10.5K)
Sync threshold 3.1 3.8 V
PWM Comparator
Delay to Output COMP set to 2V 25 ns
CS stepped 0 to 0.4V, time to onset
of OUT transition low
Min Duty Cycle COMP=0V 0 %
Max Duty Cycle (-80 Device) 80 %
Max Duty Cycle (-50 Device) 50 %
COMP to PWM Comparator Gain 0.33
COMP Open Circuit Voltage 4.5 5.4 6.3 V
COMP Short Circuit Current COMP= 0V 0.6 1.1 1.5 mA
Slope Compensation
Slope Comp Amplitude Delta increase at PWM Comparator 105 mV
(LM5071-80 Device Only) to CS
Output Section
Output High Saturation I
out
= 50mA, 0.25 0.75 V
V
CC
- V
OUT
Output Low Saturation I
out
= 100mA 0.25 0.75 V
Rise time Cload = 1nF 15 ns
Fall time Cload = 1nF 15 ns
Thermal Shutdown
Tsd Thermal Shutdown Temp. 165 °C
Thermal Shutdown 25 °C
Hysteresis
Thermal Resistance
θ
JA
Junction to Ambient PW Package 125 °C/W
(4) Specification applies to the oscillator frequency. The operational frequency of the LM5071-50 devices is divided by two.
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