L9961 datasheet(48/63 Pages) STMICROELECTRONICS

48 / 63 page

Components Value Unit

Max.

tolerance

Rating

Comments

RISENSE

Ω

1/10 W

It is used both filter differential and common mode noise on

the ISENSEp/ISENSEm input. The differential filter cut-off frequency

fC=

4πRISENSECISENSE_1+CISENSE_2+CISENSE_CM

2 .The

common mode filter cut-off frequency is

fC= 1

2πRISENSECISENSE_CM

CISENSE_CM

4.7

μF

10%

16 V

Filter common mode noise. The common mode filter cut-off frequency is

fC= 1

2πRISENSECISENSE_CM

CISENSE_1

4.7

μF

10%

16 V

Filter differencial low frequency noise on the ISENSEp/ISENSEm input.

The differential filter cut-off frequency is

fC=

4πRISENSECISENSE_1+CISENSE_2+CISENSE_CM

CISENSE_2

10%

16 V

Filter differencial high frequency noise on the ISENSEp/ISENSEm input.

The differential filter cut-off frequency is

fC=

4πRISENSECISENSE_1+CISENSE_2+CISENSE_CM

2 .

5.4

NTC analog front end

Figure 19. NTC measurement circuit

GADG220620221358SA

L9961

NTC

CFIL

VREG

RFIL

RPU

RNTC

Table 36. NTC analog front end BOM

Components

Value Unit

Max. tolerance

Rating

Comments

RNTC

kΩ

10%

1/10 W

NTC resistor

RPU

kΩ

10%

1/10 W

Provide VREG/2 polarization for NTC typical value

RFIL

kΩ

10%

1/10 W

Filter the NTC signal: cut-off frequency is

fC= 1

2πRFILCFIL

CFIL

10%

16 V

Filter the NTC signal: cut-off frequency is

fC= 1

2πRFILCFIL

L9961

NTC analog front end

DS14012 - Rev 1

page 48/63

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