L4985ATR datasheet(7/27 Pages) STMICROELECTRONICS

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Electrical characteristics

Tj = -25 to 125 °C, VCC = 15 V, CGD = 1 nF unless otherwise specified.

Table 5. Electrical characteristics

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

SUPPLY VOLTAGE

VCC

Operating range

After turn-on

24.5

VCC_ON

Turn-on threshold

Voltage rising(1)

VCC_OFF

Turn-off threshold

Voltage falling (1)

8.5

9.0

9.5

VCC_HVSTUP_OVP

Turn-on threshold of HVSTUP

in OVP state

Voltage falling(1)

10.8

11.5

12.2

VCC clamp voltage

IVCC = 20 mA(2)

24.5

SUPPLY CURRENT

ISTART_UP

Start-up current

Before turn-on, VCC = 14 V

400

550

µA

Quiescent current

VFB < VFB_FF/EBM

0.6

0.8

VFB = 2.5 V,

VCOMP< VCOMP_S

0.65

0.85

VFB > VFB_S

0.65

0.85

ICC

Operating supply current

L4985A, TON=TON_MIN(3)

2.2

2.8

L4985A, HV*TON = 1.3 ms(4)

3.8

4.7

L4985B, TON=TON_MIN(3)

3.4

4.0

L4985B, HV*TON = 0.65 ms(4)

4.6

5.5

IDIS

Quiescent in disable

VCOMP < VCOMP_DIS

450

600

µA

HIGH-VOLTAGE START-UP GENERATOR

VHV

Breakdown voltage

IHV < 100 µA

800

VHV_START

Start voltage

IVCC < 100 µA

VCC_SO

VCC switchover threshold

0.55

1.4

IHV_ON

ON-state charge current

VHV > 40 V, VCC < VCC_SO

0.7

1.3

VHV > 40 V,

VCC > VCC_SO,

VFB < VFB_HVSTUPOFF

VFB_HVSTUPOFF

Generator shutdown threshold

at FB pin

1.65

1.75

1.85

TTOUT

Generator shutdown timeout

After VCC exceeds VCC_ON &

VFB < VFB_HVSTUPOFF

100

120

IHV_OFF

OFF-state current consumption

VHV = 400 V

µA

AC BROWNOUT PROTECTION

VHVPK_BO

Brownout threshold

VHV peak voltage falling(1)

100

106

VHVPK_BI

Brown-in threshold

VHV peak voltage rising(1)

103

110

117

TDB_ACBO

Brownout debounce time

505

630

755

L4985

Electrical characteristics

DS13769 - Rev 3

page 7/27

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