COILTRONICSDR125-221-R,or datasheet(4/16 Pages) TI1

4 / 16 page

SM74301

SNVS719A – JULY 2011

www.ti.com

Electrical Characteristics (continued)

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

Temperature range. VIN = 48V, unless otherwise stated

(1).

Symbol

Parameter

Conditions

Min

Typ

Max

Units

Switch Characteristics

Buckswitch Rds(on)

Itest = 200 mA

1.25

2.57

Ω

Gate Drive UVLO

Vbst – Vsw Rising

2.8

3.8

4.8

Gate Drive UVLO hysteresis

490

Pre-charge switch voltage

At 1 mA

0.8

Pre-charge switch on-time

150

Current Limit

Current Limit Threshold

0.41

0.51

0.61

Current Limit Response Time

Iswitch Overdrive = 0.1A Time

350

to Switch Off

TOFF-1

OFF time generator

FB=0V, RCL = 100K

µs

TOFF-2

OFF time generator

FB=2.3V, RCL = 100K

2.56

µs

On Time Generator

TON - 1

Vin = 10V

2.15

2.77

3.5

µs

Ron = 200K

TON - 2

Vin = 95V

200

300

420

Ron = 200K

Remote Shutdown Threshold

Rising

0.40

0.70

1.05

Remote Shutdown Hysteresis

Minimum Off Time

Minimum Off Timer

FB = 0V

300

Regulation and OV Comparators

FB Reference Threshold

Internal reference

2.445

2.5

2.550

Trip point for switch ON

FB Over-Voltage Threshold

Trip point for switch OFF

2.875

FB Bias Current

100

Thermal Shutdown

Tsd

Thermal Shutdown Temp.

165

°C

Thermal Shutdown Hysteresis

°C

Thermal Resistance

DGK0008A Package

200

°C/W

θJA

Junction to Ambient

NGU0008B Package

°C/W

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