Datasheet
LM5035
SNVS428G –JANUARY 2006–REVISED MARCH 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. 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
PWM Controller (Comp Pin)
Delay to output 80 ns
V
PWM-OS
SS to RAMP offset 0.7 1 1.2 V
Minimum duty cycle SS = 0V 0 %
I
COMP
= 600µA, COMP current to PWM
Small signal impedance 5000 Ω
voltage
Main Output Drivers (HO and LO Pins)
Output high voltage I
OUT
= 50mA, V
HB
- V
HO
, V
VCC
- V
LO
0.5 0.25 V
Output low voltage I
OUT
= 100 mA 0.2 0.5 V
Rise time C
LOAD
= 1 nF 15 ns
Fall time C
LOAD
= 1 nF 13 ns
Deadtime, HO to LO, LO to HO V
DLY
= V
REF
, I
COMP
= 0mA 45 70 100 ns
Peak source current V
HO,LO
= 0V, V
VCC
= 10V 1.25 A
Peak sink current V
HO,LO
= 10V, V
VCC
= 10V 2 A
Voltage Feed-Forward (RAMP Pin)
RAMP comparator threshold COMP current = 0 2.4 2.5 2.6 V
Synchronous Rectifier Drivers (SR1, SR2)
Output high voltage I
OUT
= 10mA, V
VCC
- V
SR1
, V
VCC
- V
SR2
0.25 0.1 V
Output low voltage I
OUT
= 20 mA (sink) 0.08 0.2 V
Rise time C
LOAD
= 1 nF 40 ns
Fall time C
LOAD
= 1 nF 20 ns
Peak source current V
SR
= 0, V
VCC
= 10V 0.5 A
Peak sink current V
SR
= V
VCC
, V
VCC
= 10V 0.5 A
T1 R
DLY
= 10k 40 ns
Deadtime, SR1 falling to HO rising,
R
DLY
= 27.4k 75 100 125 ns
SR2 falling to LO rising
R
DLY
= 100k 300 ns
T2 R
DLY
= 10k 20 ns
Deadtime, HO falling to SR1 rising,
R
DLY
= 27.4k 30 45 65 ns
LO falling to SR2 rising
R
DLY
= 100k 140 ns
Thermal Shutdown
T
SD
Shutdown temperature 165 °C
Hysteresis 20 °C
Thermal Resistance
θ
JA
Junction to ambient, 0 LFPM Air Flow HTSSOP-20_EP package 40 °C/W
θ
JC
Junction to Case (EP)Thermal
HTSSOP-20_EP package 4 °C/W
resistance
θ
JA
Junction to ambient, 0 LFM Air Flow WQFN-24 (4 mm x 5 mm) 40 °C/W
θ
JC
Junction to Case Thermal resistance WQFN-24 (4 mm x 5 mm) 6 °C/W
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