Datasheet

LM5035
www.ti.com SNVS428G –JANUARY 2006–REVISED MARCH 2013
Electrical Characteristics
Specifications with standard typeface are for T
J
= 25°C, and those with boldface type apply over full Operating Junction
Temperature range. V
VIN
= 48V, V
VCC
= 10V externally applied, R
RT
= 15.0 kΩ, R
DLY
= 27.4kΩ, V
UVLO
= 3V, V
OVP
= 0V unless
otherwise stated
(1)(2)
.
Symbol Parameter Conditions Min Typ Max Units
Startup Regulator (VCC pin)
V
VCC
VCC voltage I
VCC
= 10mA 7.3 7.6 7.9 V
I
VCC(LIM)
VCC current limit V
VCC
= 7V 20 25 mA
V
VCCUV
VCC Under-voltage threshold (VCC VIN = VCC, ΔV
VCC
from the regulation
0.2 0.1 V
increasing) setpoint
VCC decreasing VCC – PGND 5.5 6.2 6.9 V
I
VIN
Startup regulator current VIN = 90V, UVLO = 0V 30 70 µA
Supply current into VCC from external Outputs & COMP open, V
VCC
= 10V,
4 6 mA
source Outputs Switching
Voltage Reference Regulator (REF pin)
V
REF
REF Voltage I
REF
= 0mA 4.85 5 5.15 V
REF Voltage Regulation I
REF
= 0 to 10mA 25 50 mV
REF Current Limit REF = 4.5V 15 20 mA
Under-Voltage Lock Out and shutdown (UVLO pin)
V
UVLO
Under-voltage threshold 1.212 1.25 1.288 V
I
UVLO
Hysteresis current UVLO pin sinking 19 23 27 µA
Under-voltage Shutdown Threshold UVLO voltage falling 0.3 V
Under-voltage Standby Enable
UVLO voltage rising 0.4 V
Threshold
Over-Voltage Protection (OVP pin)
V
OVP
Over-Voltage threshold 1.212 1.25 1.288 V
I
OVP
Hysteresis current OVP pin sourcing 19 23 27 µA
Current Sense Input (CS Pin)
V
CS
Current Limit Threshold 0.228 0.25 0.272 V
CS from zero to 1V. Time for HO and LO to
CS delay to output 80 ns
fall to 90% of VCC. Output load = 0 pF.
Leading edge blanking time at CS 50 ns
CS sink impedance (clocked) Internal FET sink impedance 32 60 Ω
Current Limit Restart (RES Pin)
V
RES
RES Threshold 2.4 2.5 2.6 V
Charge source current V
RES
= 1.5V 16 22 28 µA
Discharge sink current V
RES
= 1V 8 12 16 µA
Soft-Start (SS Pin)
I
SS
Charging current in normal operation V
SS
= 0 40 55 70 µA
Charging current during a hiccup
V
SS
= 0 0.6 1.2 1.8 µA
mode restart
Soft-stop Current Sink V
SS
= 2.5V 40 55 70 µA
Oscillator (RT Pin)
F
SW1
R
RT
= 15 kΩ, T
J
= 25°C 185 200 215
Frequency 1 (at HO, half oscillator
kHz
frequency)
R
RT
= 15 kΩ, T
J
= -40°C to 125°C 180 220
F
SW2
Frequency 2 (at HO, half oscillator
R
RT
= 5.49 kΩ 430 500 570 kHz
frequency)
DC level 2 V
Input Sync threshold 2.5 3 3.4 V
(1) All limits are ensured. All electrical characteristics having room temperature limits are tested during production with T
A
= 25°C. All hot
and cold limits are ensured by correlating the electrical characteristics to process and temperature variations and applying statistical
process control.
(2) Typical specifications represent the most likely parametric norm at 25°C operation
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