L4984D datasheet(9/35 Pages) STMICROELECTRONICS

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L4984D

Electrical characteristics

(Tj = -25 to 125 °C, VCC = 12 V,(a) CTIMER = 470 pF, Co = 1 nF between pin GD and GND,

CFF = 1 µF and RFF = 1 MΩ between pin VFF and GND; unless otherwise specified.)

a. Adjust VCC above VCCOn before setting at 12 V.

Table 5. Electrical characteristics

Symbol

Parameter

Test condition

Min

Typ

Max

Unit

Supply voltage

VCC

Operating range

After turn-on

10.3

22.5

VCCOn

Turn-on threshold

(1)

VCCOff

Turn-off threshold

(1)

8.7

9.5

10.3

VCCrestart

VCC for resuming from latch

OVP latched

Hys

Hysteresis

2.3

2.7

Zener voltage

Icc = 20 mA

22.5

Supply current

Istart-up

Startup current

Before turn-on, VCC = 10 V

150

µA

Quiescent current

After turn-on, VMULT = 1 V

ICC

Operating supply current

At 70 kHz

6.0

Iqdis

Idle state quiescent current

VPFC_OK > VPFC_OK_S

and

VINV < VINVD

200

280

µA

VPFC_OK < VPFC_OK_D

1.5

2.2

Quiescent current

VPFC_OK > VPFC_OK_S

VCOMP < 2.3 V

2.2

Multiplier input

IMULT

Input bias current

VMULT = 0 to 3 V

-0.2

-1

µA

VMULT

Linear operation range

0 to 3

VCLAMP

Internal clamp level

IMULT = 1 mA

9.5

Output max. slope

VMULT = 0 to 0.4 V

VVFF = 0.915 V

VCOMP = upper clamp

0.935

1.34

V/V

Gain(2)

VMULT = VCOMP = 0.915 V VCOMP

= 4 V

0.248 0.304

0.360

Error amplifier

VINV

Voltage feedback input

threshold

Tj = 25 °C

2.475

2.5

2.525

10.3 V < VCC < 22.5 V (1)

2.455

2.545

ΔVCS

ΔVMULT

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