L9958XP datasheet(32/38 Pages) STMICROELECTRONICS

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Electrical specifications

L9958

32/38

Doc ID 17269 Rev 5

6.4.10

Timing characteristics

Table 27.

Timing characteristics

Pos.

Symbol

Parameter

Test condition

Min.

Typ.

Max.

Unit

10.1

fpwm

PWM frequency

kHz

10.2

Tdon

Delay time for switch-on

Rload @ Iout = 3 A

PWM

→ 90% Vout (or

10 % Iout)

µs

Tdoff

Delay time for switch-off

Rload @ Iout = 3 A

PWM

→ 10 % Vout (or

90% Iout)

µs

ΔTd

Delay time: symmetry

PWM accuracy = 1% @

2kHz

µs

10.3

Td_dis

Disable delay time

DI / EN

→ 90% OUTx

@ Iout = 3 A

µs

10.4

Td_en

Enable delay time

DI / EN

→ 10 % OUT

µs

10.5

Td_pow

Power-on delay time

DIR= PWM=EN=1 /

DI=0 no load / VPS =

Vdd increasing

Vps = Vdd → 10 % Vout1

(= Vps)

200

µs

10.6

Td_filter

DI / EN digital filter time

µs

10.7

Trise_H

Low-side transistor rise time

Non selectable by SPI

0.04

0.2

µs

10.8

Tfall_H

Low-side transistor fall time

Non selectable by SPI

µs

10.9

dVout/dt

Voltage slew rate for high-side

transistors

(Measurement is performed

between 30 % and 70 % of the

slope)

super fast mode

V/µs

VSR = 0

VSR = 1

10.10

dIout/dt

Current slew rate for high-side

transistors

(Measurement is performed

between 40 % and 60 % of the

slope)

ISR=0

1.5

4.5

A/µs

ISR=1

0.15

0.3

0.45

10.11

Tdiag

Timing for reliable diagnostic

Guaranteed through

SCAN pattern

µs

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