AS3630 datasheet(65/72 Pages) AMSCO

65 / 72 page

8A Supercap Flash Driver

AS3630 – 65

Thermistor (NTC)

The NTC is used to protect the LED against overheating

(hardware protection inside the AS3649, which works without

any software - see “NTC - Flash LED Overtemperature Protection

- fault_ntc” on page 37.

The thermistor has to be thermally coupled to the LED (and

therefore as close as possible to the LED) and it shall not share

the same ground connection as the LED return ground (if they

share the same ground connection the high current through

the LED will offset the measurement of the NTC).

Figure AS3630 – 51:

Recommended Thermistors

It is recommended to use 220k

Ω resistance for a detection

threshold of 125ºC, 100k

Ω for 110ºC and 68kΩ for 80ºC LED

temperature detection threshold.

Part Number

Resistance @ 25ºC

B-constant 25/50ºC

Size

Manufacturer

NCP02WF104F05RH

100kΩ ±1%

4250k ±1%

01005 (inch)

Murata

www.murata.com

NCP02XH103F05RH

10kΩ ±1%

3380k ±1%

01005 (inch)

NCP03WL224E05RL

220kΩ ± 3%

4485K ± 1%

0201 (inch)

NCP03WL104E05RL

100kΩ ± 3%

4485K ± 1%

NCP15WF104F03RC

100kΩ

0402 (inch)

NCP15WL683J03RC

68kΩ

NTCG104QH224HT

220kΩ ± 3%

4750k ± 3%

1.0x0.5mm

TDK

www.tdk.com

NTCG104EF104FT

100kΩ ± 1%

4250k ± 1%

NTCG104LH683JT

68kΩ ± 5%

4550k ± 3%

NTCG104BF683JT

4085k ± 1%

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