L9961-TR datasheet(34/65 Pages) STMICROELECTRONICS

34 / 65 page

VB according to the operating range of Table 2; TJ according to the operating range of Table 5.

Table 25. CHG/DCHG pre-driver electrical parameter

Symbol

Parameter

Test conditions

Min. Typ. Max. Unit

FPRDRV

Pre-driver expected

switching frequency

Application info

DCHG, VSD, VSC,

CHG

CPRDRV_LOAD

Equivalent capacitive load

on CHG/DCGH pins

Application info

DCHG, VSD, VSC,

CHG

VGS_ON1

CHG/DCHG ON voltage

VB > 5.0 V

7.2 10.5 11.7

DCHG, VSD, VSC,

CHG

VGS_ON2

CHG/DCHG ON voltage

4.3V < VB < 5.0 V

6.0

DCHG, VSD, VSC,

CHG

VGS_OFF

CHG/DCHG OFF voltage

I(CHG) = I(DCHG) = 0.450 mA

V(VSx)=0 V

100

DCHG, VSD, VSC,

CHG

IPU

CHG/DCHG current source

V(CHG)-V(VSC)=0 V

V(DCHG)-V(VSD)=0 V

V(VSx)=0 V

-2.4

-0.6

DCHG, VSD, VSC,

CHG

IPD

CHG/DCHG current sink

V(CHG)-V(VSC)=1.4 V

V(DCHG)-V(VSD)=1.4 V

V(VSx)=0 V

12.5 39.2

DCHG, VSD, VSC,

CHG

IPD_PEAK

CHG/DCHG current sink

peak

Design info

18.5

DCHG, VSD, VSC,

CHG

RPD

CHG/DCHG pulldown

resistance

V(CHG)-V(VSC)=0.3 V

V(DCHG)-V(VSD)=0.3 V

V(VSx)=0 V

Ω

DCHG, VSD, VSC,

CHG

3.7.2

FUSE pre-driver

Under certain conditions classified as permanent failures, L9961 can be programmed to activate the FUSE

pre-driver. An external NMOS can be driven to blow up a fuse connected in series to the battery pack positive

terminal.

The following list of failures is classified as permanent:

•

Severe cell UV: aimed at preventing copper deposition (see Section 3.4.1 Cell voltage monitor (Cx))

•

Severe cell OV: aimed at preventing explosion hazard (see Section 3.4.1 Cell voltage monitor (Cx))

•

VB vs. Sum Of Cells plausibility check fail: aimed at preventing BMS permanent malfunction (see

Section 3.4.2 Battery stack monitor (VB))

•

Severe NTC OT: aimed at preventing fire hazard (see Section 3.4.3 Cell temperature monitor (NTC))

•

Persistent charge current: aimed at preventing overcharge (see Section 3.5.3 Overcurrent monitor)

•

Persistent discharge current: aimed at preventing overdischarge (see Section 3.5.3 Overcurrent monitor)

•

Persistent short circuit in discharge: aimed at preventing fire hazard (see Section 3.5.4 Short-circuit in

discharge protection)

In addition to the internal diagnostics, L9961 can also enable the FUSE predriver upon:

•

User request through I2C

FUSE must start from the OFF condition (FUSE_TRIG_FIRE = 01)

FUSE shall be first armed writing FUSE_TRIG_ARM = 10

L9961

HS/LS pre-drivers (CHG/DCHG/FUSE)

DS14012 - Rev 3

page 34/65

L9961-TR Scheda tecnica(PDF) 34 Page - STMicroelectronics

L9961-TR Scheda tecnica(HTML) 34 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65

Scheda tecnica Scarica

Link URL