LM5035B

SNVS613C – JULY 2009 – REVISED APRIL 2013

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Electrical Characteristics (continued)

Specifications with standard typeface are for TJ = 25°C, and those with boldface type apply over full Operating Junction

Temperature range. VVIN = 48V, VVCC = 10V externally applied, RRT = 15.0 kΩ, RDLY = 27.4kΩ, VUVLO = 3V, VOVP = 0V unless

otherwise stated

(1)(2).

Symbol

Parameter

Conditions

Min

Typ

Max

Units

Under-voltage Standby Enable

UVLO voltage rising

0.4

V

Threshold

Over-Voltage Protection (OVP pin)

VOVP

Over-Voltage threshold

1.212

1.25

1.288

V

IOVP

Hysteresis current

OVP pin sourcing

19

23

27

µA

Current Sense Input (CS Pin)

VCS

Current Limit Threshold

0.228

0.25

0.272

V

CS delay to output

CS from zero to 1V. Time for HO and LO to

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)

VRES

RES Threshold

2.4

2.5

2.6

V

Charge source current

VRES = 1.5V

16

22

28

µA

Discharge sink current

VRES = 1V

8

12

16

µA

Soft-Start (SS Pin)

ISS

Charging current in normal operation

VSS = 0

80

110

140

µA

Charging current during a hiccup

VSS = 0

0.6

1.2

1.8

µA

mode restart

Soft-stop Current Sink

VSS = 2.5V

80

110

140

µA

Oscillator (RT Pin)

FSW1

Frequency 1 (at HO, half oscillator

RRT = 15 kΩ, TJ = 25°C

185

200

215

kHz

frequency)

RRT = 15 kΩ, TJ = -40°C to 125°C

180

220

FSW2

Frequency 2 (at HO, half oscillator

RRT = 5.49 kΩ

430

500

570

kHz

frequency)

DC level

2

V

Input Sync threshold

2.5

3

3.4

V

PWM Controller (Comp Pin)

Delay to output

80

ns

VPWM-OS

SS to RAMP offset

0.7

1

1.2

V

Minimum duty cycle

SS = 0V

0

%

Small signal impedance

ICOMP = 600µA, COMP current to PWM

6200

Ω

voltage

Main Output Drivers (HO and LO Pins)

Output high voltage

IOUT = 50mA, VHB - VHO, VVCC - VLO

0.5

0.25

V

Output low voltage

IOUT = 100 mA

0.2

0.5

V

Rise time

CLOAD = 1 nF

15

ns

Fall time

CLOAD = 1 nF

13

ns

Peak source current

VHO,LO = 0V, VVCC = 10V

1.25

A

Peak sink current

VHO,LO = 10V, VVCC = 10V

2

A

HB Threshold

VCC rising

3.8

V

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

IOUT = 10mA, VVCC - VSR1, VVCC - VSR2

0.25

0.1

V

Output low voltage

IOUT = 20 mA (sink)

0.08

0.2

V

6

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