[AP2071AEN]

MS1607-E-00

- 13 -

2014/03

Figure 7. Torch Mode Sequence (Formula(2))

(1) The power must be supplied when the EN pin = “L”. After the power is supplied (VIN≥2.5V), the EN

pin can be set from “L” to “H”. In this case, the EN pin should be held to “L” longer than 300ns to reset

the AP2071AEN.

(2) Set registers 1ms after the EN pin is set from “L” to “H”.

(3) LEDs can be driven if the output voltage (VOUT) reaches VSET voltage.

LED current reaches the setting current within 80us.

(4) The internal DC-DC boosting circuit is not in operation while VOUT > VIN.

(5) The internal DC-DC boosting circuit starts operation when VOUT = VIN*1.07.

(6) The LED current becomes 0mA when the CHARGE pin is “L” and CHAR bit= “0”, or setting TORCH

bit to “0”.

CHARGE pin= “H” or CHAR bit= “1”: The AP2071AEN starts charging to an external EDLC.

CHARGE pin= “L” and CHAR bit= “0”: The AP2071AEN does not charge to an external EDLC.

Power Supply

（VIN）

EN pin

Resister

Setting

(1)

(2)

Inductor

Current

Set

VOUT

Vset

CHARGE pin

or CHAR bit

VF+0.5V

TORCH bit

LED Current

(3)

Vset*0.99

(3)

(4)

(5)

(6)

(4)

(5)

VIN

VIN*1.07