LM3488 datasheet(4/24 Pages) NSC

4 / 24 page

Electrical Characteristics (Continued)

Specifications in Standard type face are for T

J = 25˚C, and in bold type face apply over the full Operating Temperature

Range. Unless otherwise specified, V

IN = 12V, RFA = 40k

Ω

Symbol

Parameter

Conditions

Typical

Limit

Units

Short-Circuit Current

Limit Sense Voltage

IN = 5V

325

235

395

mV (min)

mV (max)

Internal Compensation

Ramp Voltage

IN =5V

132

mV(min)

mV(max)

OVP

Output Over-voltage

Protection (with

respect to feedback

voltage) (Note 8)

COMP = 1.4V

32/ 25

78/ 85

mV(min)

mV(max)

OVP(HYS)

Output Over-Voltage

Protection

Hysteresis(Note 8)

COMP = 1.4V

110

mV(min)

mV(max)

Error Ampifier

Transconductance

COMP = 1.4V

EAO = 100µA

(Source/Sink)

800

600/ 365

1000/ 1265

µmho

µmho (min)

µmho (max)

VOL

Error Amplifier Voltage

Gain

COMP = 1.4V

EAO = 100µA

(Source/Sink)

V/V

V/V (min)

V/V (max)

EAO

Error Amplifier Output

Current (Source/ Sink)

Source, V

COMP = 1.4V,

FB =0V

110

80/ 50

140/ 180

µA

µA (min)

µA (max)

Sink, V

COMP = 1.4V, VFB

= 1.4V

−140

−100/ −85

−180/ −185

µA

µA (min)

µA (max)

EAO

Error Amplifier Output

Voltage Swing

Upper Limit

FB =0V

COMP Pin = Floating

2.2

1.8

2.4

V(min)

V(max)

Lower Limit

FB = 1.4V

0.56

0.2

1.0

V(min)

V(max)

Internal Soft-Start

Delay

FB = 1.2V, VCOMP =

Floating

msec

Drive Pin Rise Time

Cgs = 3000pf, V

DR =0 to

Drive Pin Fall Time

Cgs = 3000pf, V

DR =0 to

VSD

Shutdown and

Synchronization signal

threshold (Note 5)

Output = High

1.27

1.35

V (max)

Output = Low

0.65

0.35

V (min)

Shutdown Pin Current

SD =5V

−1

µA

SD =0V

TSD

Thermal Shutdown

165

˚C

Thermal Shutdown

Hysteresis

˚C

Thermal Resistance

MM Package

200

˚C/W

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