Datasheet
LM5032
SNVS344A –MARCH 2005–REVISED APRIL 2013
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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. VIN = 48V, VCC = 10V externally applied, R
T
= R
DCL
= 42.2kΩ, UVLO = 1.5V, unless otherwise stated,
see
(1)
and see
(2)
.
Symbol Parameter Conditions Min Typ Max Units
R
CS
Equivalent input resistance at CS taken from 0.2V to 0.5V, internal FET 42 kΩ
CS off.
Current Limit Restart (RES Pin)
ResTh Threshold 2.4 2.55 2.7 V
Charge source current 15 20 25 µA
Discharge sink current 7.5 10 12.5 µA
Soft-start (SS1, SS2 Pins)
I
SS
Current source (normal 35 50 65 µA
operation)
Current source during a current 0.7 1 1.3 µA
limit restart
V
SS
Open circuit voltage 5 V
Oscillator (RT/SYNC Pin)
F
S1
Frequency 1 (at OUT1, OUT2) R
T
= 42.2 kΩ 183 200 217 kHz
F
S2
Frequency 2 (at OUT1, OUT2) R
T
= 13.7 kΩ 530 600 670 kHz
DC voltage 2 V
Input Sync threshold 2.6 3.3 3.7 V
PWM Controller (COMP1, COMP2, Duty Cycle Limit Pins)
Delay to output COMP1 (COMP2) set to 2V. CS1 (CS2) 50 ns
stepped from 0 to 0.4V. Time for OUT1
(OUT2) to fall to 90% of VCC. Output load
= 0 pF.
V
COMP
COMP1 (COMP2) open circuit 5 V
voltage
I
COMP
COMP1 (COMP2) short circuit COMP1 (COMP2) = 0V 0.6 1 1.4 mA
current
COMP1 (COMP2) to PWM1 0.33 V/V
(PWM2) gain
Minimum duty cycle SS1 (SS2) = 0V 0 %
Maximum duty cycle 1 UVLO pin = 1.30V, R
DCL
= R
T
, COMP1 76 %
(COMP2) = open
Maximum duty cycle 2 UVLO pin = 3.75V, R
DCL
= R
T
, COMP1 20 %
(COMP2) = open
Maximum duty cycle 3 UVLO pin = 1.30V, R
DCL
= R
T
/4, COMP1 20 %
(COMP2) = open
Maximum duty cycle 4 UVLO pin = 2.50V, R
DCL
= R
T
, COMP1 50 %
(COMP2) = open
Maximum duty cycle 5 UVLO pin = 1.30V, R
DCL
= R
T
/2, COMP1 40 %
(COMP2) = open
Slope compensation Delta increase at PWM comparator to CS1 90 mV
(CS2)
Channel mismatch CS1 (CS2) = 0.25V 7 %
Soft-start to COMP offset SS1 (SS2) = 0.8V 0 V
Main Output Drivers (OUT1, OUT2)
Output high voltage I
OUT
= 50mA (source) VCC-1 VCC-0.2 V
Output low voltage I
OUT
= 100 mA (sink) 0.3 1 V
Rise time C
LOAD
= 1 nF 12 ns
Fall time C
LOAD
= 1 nF 10 ns
Peak source current 1.5 A
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