ACT510x

Rev 1.0, 04-Apr-2018

14

ISRN

ISRP

VIN

VIN

ILIM

2V

+

+

-

-

Figure 6: Input Current Sensing and Current Limit Setting

This voltage on the ILIM pin is calculated by:

Equation 2

The voltage on this pin is regulated and the charger goes into input current limit mode and starts to reduce the charger

current when this pin voltage reaches 2V. The ILIM pin can also be used to monitor input current .The voltage on ILIM pin

is proportional to the input current.

If input current limit function is not needed, it can be disabled in INPUT_ILIM Register 0x10 [3:2].

5.5. VOUT Over-Voltage Protection

ACT510x monitors the output voltage and immediately stop switching when senses an overvoltage condition. If the OV

condition lasts for 100msec, then the device will enter HIZ state.

5.6. Regulator Compensation and Inductor Selection

Table 2: L/C Selection Table

47uF is low ESR Ceramic Type. 100uF to 1000uF is bulk electrolytic capacitor.

Frequency

Setting

Inductor MIN

(uH)

Inductor TYP

(uH)

Inductor Max

(uH)

(nF)

(nF)

(KOhms)

(uF)

125Khz

29

42

55

82

8.2

20.0

1000 / 47

250Khz

15

22

29

39

3.9

20.0

470 / 47

500KHz

7

10

13

22

2.2

20.0

220 / 47

1MHZ

4

5.6

7.28

10

1.0

20.0

100 / 47