L6258 datasheet(9/32 Pages) STMICROELECTRONICS

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L6258

Block diagram

9/32

ΔT

SD-H

Shut down hysteresis

°C

TSD

Thermal shutdown

150

°C

fosc

Triangular oscillator

frequency(1)

CFREF = 1nF

12.5

18.5

KHz

TRANSISTORS

IDSS

Leakage current

OFF State

500

µA

Rds(on)

On resistance

ON state

0.6

0.75

Flywheel diode voltage

If =1.0A

1.4

CONTROL LOGIC

Vin(H)

lnput voltage

All Inputs

VDD

Vin(L)

Input voltage

All inputs

0.8

Iin

Input current (2)

0 < Vin < 5V

-150

+10

µA

Idis

Disable pin input current

-10

+150

µA

Vref1/ref2

Reference voltage

Operating

2.5

Iref

Vref terminal input current Vref = 1.25

-2

µA

FI =

Vref/Vsense

PWM loop transfer ratio

1.94

VFS

DAC full scale precision

Vref = 2.5V I0/I1/I2/I3 = L

1.23

1.29

1.34

Voffset

Current loop offset

Vref = 2.5V I0/I1/I2/I3 = H

-30

+30

DAC factor ratio

Normalized @ full scale

value

-2

SENSE AMPLIFIER

Vcm

lnput common mode

voltage range

-0.7

VS+0.7

Iinp

Input bias

sense1/sense2

-200

µA

ERROR AMPLIFIER

Open loop voltage gain

Output slew rate

Open loop

0.2

V/µs

GBW

Gain bandwidth product

400

kHz

Chopping frequency is twice fosc value.

This is true for all the logic inputs except the disable input.

Table 4.

Electrical characteristics (continued)

(VS = 40V; VDD = 5V; Tj = 25°; unless otherwise specified.)

Parameter

Description

Test condition

Min.

Typ.

Max.

Unit

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