Datasheet

LM5072
SNVS437D –MARCH 2006–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, F
OSC
= 250kHz.
Symbol Parameter Conditions Min Typ Max Units
Soft-start
Soft-start Current Source 8 10 12 µA
Oscillator
Frequency1 (R
T
= 26.1 kΩ) 175 200 225 KHz
Frequency2 (R
T
= 8.7 kΩ) 515 580 645 KHz
Sync threshold 2.6 3.2 3.8 V
PWM Comparator
Delay to Output 25 ns
Min Duty Cycle 0 %
Max Duty Cycle (-80 Device) 75 80 85 %
Max Duty Cycle (-50 Device) 47 50 53 %
COMP to PWM Comparator Gain 0.33
COMP Open Circuit Voltage 4.3 5.2 6.1 V
COMP Short Circuit Current 0.6 1.0 1.4 mA
Slope Compensation (LM5072-80 Device Only)
Slope Comp Amplitude 70 90 110 mV
Output Section
Output High Saturation 0.25 0.75 V
Output Low Saturation 0.25 0.75 V
t
r
Rise time C
LOAD
= 1nF 18 ns
t
f
Fall time C
LOAD
= 1nF 15 ns
PDI Thermal Shutdown
(3)
Thermal Shutdown Temp. 165 °C
Thermal Shutdown Hysteresis 25 °C
Thermal Resistance
θ
JA
Junction to Ambient PWP package 40 °C/W
(3) Device thermal limitations may limit usable range.
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