Datasheet

LM5041A
SNVS350B –MARCH 2005–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
= 48V, V
CC
= 10V, RT = 26.7kΩ, R
SET
= 20kΩ) unless otherwise stated
(1)
Symbol Parameter Conditions Min Typ Max Units
Reference Supply
V
REF
Ref Voltage I
REF
= 0 mA 4.85 5 5.15 V
Ref Voltage Regulation I
REF
= 0 to 10mA 25 50 mV
Ref Current Limit 15 20 mA
Current Limit
CS Step from 0 to 0.6V
ILIM Delay to Output Time to Onset of OUT 40 ns
Transition (90%), C
L
= 0
Cycle by Cycle Threshold
0.45 0.5 0.55 V
Voltage
Leading Edge Blanking
50 ns
Time
CS Sink Current (clocked) CS = 0.3V 2 5 mA
Soft-Start
Soft-start Current Source 7 10 13 µA
Soft-start to COMP Offset 0.35 0.55 0.75 V
Oscillator
Frequency1 180 200 220
T
J
= 25°C kHz
(RT = 26.7KΩ) 175 225
Frequency2
515 600 685 kHz
(RT = 7.87KΩ)
Sync threshold 3 3.5 V
PWM Comparator
COMP set to 2V CS stepped
Delay to Output 0 to 0.4V, Time to onset of 25 ns
OUT transition low
Max Duty Cycle TS = Oscillator Period (Ts-240ns)/Ts) %
Min Duty Cycle COMP = 0V 0 %
COMP to PWM
0.32
Comparator Gain
COMP Open Circuit
FB = 0V 4.1 4.8 5.5 V
Voltage
COMP Short Circuit
FB = 0V, COMP = 0V 0.6 1 1.4 mA
Current
Slope Compensation
Delta increase at PWM
Slope Comp Amplitude 110 mV
Comparator to CS
UVLO Shutdown
Under-voltage Shutdown 2.44 2.5 2.56 V
Under-voltage Shutdown
Hysteresis Current 16 20 24 µA
Source
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