LM5116-HT

SLVSBS8B – OCTOBER 2013 – REVISED JANUARY 2014

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Electrical Characteristics (continued)

Limits in standard type are for TJ = 25°C only; limits in boldface type apply over the junction temperature range of -55°C to

+175°C and are provided for reference only. Unless otherwise specified, the following conditions apply: VIN = 48V,

VCC = 7.4 V, VCCX = 0 V, EN = 5 V, RT = 16 kΩ, no load on LO and HO.

Symbol

Parameter

Conditions

Min

Typ

Max

Units

Error Amplifier

VREF

FB Reference Voltage

Measured at FB pin,

1.195

1.215

1.231

V

FB = COMP

FB Input Bias Current

FB = 2 V

15

600

nA

COMP Sink/Source Current

3

mA

AOL

DC Gain

80

dB

fBW

Unity Gain Bandwidth

3

MHz

PWM Comparators

tHO(OFF)

Forced HO Off-time

320

450

600

ns

tON(min)

Minimum HO On-time

VIN = 80 V, CRAMP = 50 pF

100

ns

Oscillator

fSW1

Frequency 1

RT = 16 k

Ω

175

200

225

kHz

fSW2

Frequency 2

RT = 5 k

Ω

470

535

610

kHz

RT output voltage

1.191

1.215

1.239

V

RT sync positive threshold

2.6

3.5

4.4

V

Current Limit

VCS(TH)

Cycle-by-cycle Sense Voltage Threshold VCCX = 0 V, RAMP = 0 V

94

110

126

mV

(CSG - CS)

VCS(THX)

Cycle-by-cycle Sense Voltage Threshold VCCX = 5 V, RAMP = 0 V

105

122

139

mV

(CSG - CS)

CS Bias Current

CS = 100 V

-5

5

µA

CS Bias Current

CS = 0 V

90

125

µA

CSG Bias Current

CSG = 0 V

90

125

µA

Current Limit Fault Timer

RT = 16 kΩ, (200 kHz),

1.28

ms

(256 clock cycles)

RAMP Generator

IR1

RAMP Current 1

VIN = 60 V, VOUT = 10 V

235

285

335

µA

IR2

RAMP Current 2

VIN = 10 V, VOUT = 10 V

21

28

35

µA

VOUT Bias Current

VOUT = 36 V

200

µA

RAMP Output Low Voltage

VIN = 60 V, VOUT = 10 V

265

mV

Diode Emulation

SW Zero Cross Threshold

-6

mV

DEMB Output Current

DEMB = 0 V, SS = 1.25 V

1.6

2.7

4.5

µA

DEMB Output Current

DEMB =0 V, SS = 2.8 V

28

38

48

µA

DEMB Output Current

DEMB = 0 V, SS = Regulated

45

65

85

µA

by FB

LO Gate Driver

VOLL

LO Low-state Output Voltage

ILO = 100 mA

0.08

0.18

V

VOHL

LO High-state Output Voltage

ILO = -100 mA,

0.25

V

VOHL = VCC - VLO

LO Rise Time

C-load = 1000 pF

18

ns

LO Fall Time

C-load = 1000 pF

12

ns

IOHL

Peak LO Source Current

VLO = 0 V

1.8

A

IOLL

Peak LO Sink Current

VLO = VCC

3.5

A

6

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