CONFIDENTIAL

[AP2061]

Rev.0.1

- 8 -

2012/10

AP2061 can detect LED temperature with NTC thermistor (Negative Temperature Coefficient Thermistor) which connect

to NTC pin. The current which flow at NTC thermistor is 35uA.

Protection

Working condition

Device status

Return condition

LED1~2 temperature

protection (Note 5)

NTC pin voltage

< setting voltage(DET[2:0])

All circuits power-down

Address= “06H”, NTC= “1”

Set LED1= LED2=

“0” again

Note 5. The parasitic capacitor of NTC pin should be lower 50pF.

Example）

NTC thermistor： NCP15WM154(150k @25°C、B constant=4582, 1005 size, Murata)

NCP15WM224(220k @25°C、B constant=4582, 1005 size, Murata)

Formula： R=Ro*exp(B*(1/T-1/To))

(R：The value in the case of ambit temperature T(k)；

Ro：The value in the case of ambit temperature To(k))

Detection voltage(V) @typ

(set by resistor)

0.60

0.67

0.74

0.81

0.88

0.95

1.02

Detection resistor (kohm)

17.1

19.1

21.1

23.1

25.1

27.1

29.1

Detection temperature(°C)

(in the case of using 150kohm)

74

71

69

66

64

62

61

Detection temperature(°C)

(in the case of using 220kohm)

84

82

79

76

74

72

70

Resistor

(kohm)

Temperature(°C)

In the case of using 150kohm

In the case of using 220kohm