LM5071 datasheet(5/24 Pages) TI

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LM5071

www.ti.com

SNVS409E – NOVEMBER 2005 – REVISED APRIL 2013

Electrical Characteristics

(1)

Specifications in standard type face are for TJ = +25°C and those in boldface type apply over the full operating junction

temperature range. Unless otherwise specified: VIN = 48V, VCC = 10V, RT = 30.3kΩ.

Symbol

Parameter

Conditions

Min

Typ

Max

Units

Powered Interface

IOS

Offset Current

VIN < 10.0V

VCLSS(ON)

Signature Resistor Disable /

VIN with respect to VEE

10.0

11.5

12.5

Classification Current Turn On

VCLSS(OFF)

Classification Current Turn Off

VIN with respect to VEE

23.5

25.0

26.5

Classification Voltage

With respect to VEE

1.43

1.5

1.57

ICLASS

Supply Current During

VIN =17V

0.5

1.0

Classification

IDC

Supply Current During Normal

OUT floating

1.9

Operation

UVLO Pin Reference Voltage

VIN > 27V

1.95

2.00

2.05

UVLO Hysteresis Current

VIN > UVLO

8.0

11.5

Softstart Release

RTN falling with respect to VEE

1.2

1.45

1.7

Softstart Release Hysteresis

RTN rising with respect to VEE

0.8

1.1

1.3

RDS(ON)

PowerFET Resistance

I = 350mA, VIN = 48V

2.2

Ω

ILEAK

SMPS Bias Current

VEE = 0V, VIN = RTN = 57V

100

AUX Pin Threshold

AUX pin rising with respect to VEE

2.4

2.5

2.65

AUX Pin Threshold Hysteresis

AUX pin falling with respect to VEE

0.4

0.5

0.6

ZAUX

AUX Pin Input Impedance

AUX = 0.5V

350

Ω

IINRUSH

Inrush Current Limit

VEE = 0V, RTN = 3.0V

100

130

ILIM

DC Current Limit

VEE = 0V, RTN = 3.0V,

350

390

420

Temp = 0°C to 85°C

ILIM

DC Current Limit

VEE = 0V, RTN = 3.0V, Temp = -

325

390

420

40°C to 125°C

Startup Regulator

VinMin

Operational VIN Input Voltage

AUX = 5V, Vcc = Vin(2)

9.5

VccReg

VCC Regulation

Open ckt

7.5

7.8

8.1

VCC Current Limit

See(3)

VCC Supply

VCC UVLO (Rising)

VccReg

VccReg –

– 300mV

100mV

VCC UVLO (Falling)

5.9

6.25

6.6

Supply Current (Icc)

Cload = 0

1.5

Error Amplifier

GBW

Gain Bandwidth

MHz

DC Gain

Input Voltage

FB = COMP

1.219

1.281

1.212

1.288

COMP Sink Capability

FB=1.5V COMP=1V

Current Limit

ILIM Delay to Output

CS step from 0 to 0.6V, time to

onset of OUT transition (90%)

Cycle by Cycle Current Limit

0.44

0.5

0.56

Threshold Voltage

(1)

Min and Max limits are 100% production tested at 25 °C. Limits over the operating temperature range are specified through correlation

using Statistical Quality Control (SQC) methods. Limits are used to calculate Texas Instruments’ Average Outgoing Quality Level

(AOQL).

(2)

The Vcc regulator requires an external source whenever the Vin pin is below 13V with respect to RTN. An external load on Vcc

increases this startup voltage requirement.

(3)

Device thermal limitations may limit usable range.

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