LM5005
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SNVS397D –SEPTEMBER 2005–REVISED MARCH 2013
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
= 48V, R
T
= 32.4kΩ unless otherwise stated.
Symbol Parameter Conditions Min
(1)
Typ Max
(1)
Units
Cycle by Cycle Current Limit RAMP = 0V 3 3.5 4.25 A
Cycle by Cycle Current Limit Delay RAMP = 2.5V 100 ns
SOFT-START
SS Current Source 7 10 13 µA
OSCILLATOR
Frequency1 180 200 220 KHz
Frequency2 RT = 11kΩ 425 485 525 KHz
SYNC Source Impedance 10 kΩ
SYNC Sink Impedance 160 Ω
SYNC Threshold (falling) 1.4 V
SYNC Frequency Range 550 KHz
SYNC Pulse Width Minimum 15 ns
RAMP GENERATOR
Ramp Current 1 Vin = 60V, Vout=10V 234 275 316 µA
Ramp Current 2 Vin = 10V, Vout=10V 20 25 30 µA
PWM COMPARATOR
Forced Off-time 500 ns
Min On-time 80 ns
COMP to PWM Comparator Offset 0.7 V
ERROR AMPLIFIER
Feedback Voltage Vfb = COMP 1.207 1.225 1.243 V
FB Bias Current 10 nA
DC Gain 70 dB
COMP Sink / Source Current 3 mA
Unity Gain Bandwidth 3 MHz
THERMAL SHUTDOWN
Tsd Thermal Shutdown Threshold 165 °C
Thermal Shutdown Hysteresis 25 °C
THERMAL RESISTANCE
θ
JC
Junction to Case 4 °C/W
θ
JA
Junction to Ambient 40 °C/W
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