LM5085MMXSLASHNOPB datasheet(5/33 Pages) TI

5 / 33 page

LM5085, LM5085-Q1

www.ti.com

SNVS565I – NOVEMBER 2008 – REVISED AUGUST 2015

Electrical Characteristics (continued)

Typical values correspond to TJ = 25°C. Minimum and maximum limits apply over –40°C to 125°C junction temperature range

unless otherwise stated. Unless otherwise stated the following conditions apply: VIN = 48 V, RT = 100kΩ.

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

PGATE PIN

VPGATE(HI)

PGATE High Voltage

PGATE Pin = Open

VIN -0.1

VIN

VPGATE(LO)

PGATE Low Voltage

PGATE Pin = Open

VCC

VCC+0.1

VPGATE(HI)4.5

PGATE High Voltage at Vin = 4.5V

PGATE Pin = Open

VIN -0.1

VIN

VPGATE(LO)4.5

PGATE Low Voltage at Vin = 4.5V

PGATE Pin = Open

VCC

VCC+0.1

IPGATE

Driver Output Source Current

VIN = 12 V, PGATE = VIN - 3.5 V

1.75

Driver Output Sink Current

VIN = 12 V, PGATE = VIN - 3.5 V

1.5

RPGATE

Driver Output Resistance

Source Current = 500 mA

2.3

Ω

Sink Current = 500 mA

2.3

Ω

CURRENT LIMIT DETECTION

IADJ

ADJUST Pin Current Source

VADJ = 46.5 V

µA

VCL OFFSET

Current Limit Comparator Offset

VADJ = 46.5 V, VADJ - VISEN

-9

RT PIN

RTSD

Shutdown Threshold

RT Pin Voltage Rising

0.73

RTHYS

Shutdown Threshold Hysteresis

ON-TIME

tON – 1

On-Time

VIN = 4.5 V, RT = 100kΩ

3.5

7.15

µs

tON – 2

VIN = 48 V, RT = 100kΩ

276

360

435

tON - 3

VIN = 75 V, RT = 100kΩ

177

235

285

tON - 4

Minimum On-Time in Current Limit

VIN = 48 V, 25 mV Overdrive at ISEN

140

235

(3)

OFF-TIME

tOFF(CL1)

VIN = 12 V, VFB = 0 V

5.35

7.9

10.84

µs

tOFF(CL2)

VIN = 12 V, VFB = 1 V

1.42

1.9

3.03

µs

Off-Time (Current Limit) (3)

tOFF(CL3)

VIN = 48 V, VFB = 0 V

32.4

µs

tOFF(CL4)

VIN = 48 V, VFB = 1 V

3.89

5.7

8.67

µs

REGULATION AND OVERVOLTAGE COMPARATORS (FB PIN)

VREF

FB Regulation Threshold

1.225

1.25

1.275

VOV

FB Over-Voltage Threshold

Measured with Respect to VREF

350

IFB

FB Bias Current

SOFT-START FUNCTION

tSS

Soft-Start Time

1.4

2.5

4.3

THERMAL SHUTDOWN

TSD

Junction Shutdown Temperature

Junction Temperature Rising

170

°C

THYS

Junction Shutdown Hysteresis

°C

(3)

The tolerance of the minimum on-time (tON-4) and the current limit off-times (tOFF(CL1) through (tOFF(CL4)) track each other over process

and temperature variations. A device which has an on-time at the high end of the range will have an off-time that is at the high end of its

range.

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