AP2071 Datasheet, PDF (25/31 Pages) Asahi Kasei Microsystems – High Current (8A) white LEDs driver for Flash with I2C

[AP2071AEN]
LIMIT2, LIMIT1, LIMIT0: Inductor Limit Current Setting for during DC-DC Operation
*The setting of LIMIT2-0 = “110” or “111” is prohibited.
Table 6. Inductor Limit Current Setting
LIMITSEL LIMIT2 LIMIT1 LIMIT0
0
0
0
0
0
1
0
1
0
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
0
0
0
0
0
1
0
1
0
1
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
Current (mA)
VOUT≤5V
400
500
600
800
1000
1500
-
-
400
500
600
800
1000
1500
-
-
Current (mA)
VOUT>5V
400
500
500
500
500
500
-
-
400
500
600
800
1000
1000
-
-
Addr Register Name D7
D6
D5
D4
D3
D2
D1
D0
06H Other Setting1
LIMITSEL NTC2 NTC1 NTC0
R/W
R/W R/W R/W R/W R/W
R/W R/W R/W
Default
1
1
1
0
0
0
0
0
NTC0, NTC1, NTC2: NTC pin Detection Voltage Setting (The NTC pin supplies 35µA (typ.) current source.)
* Connect a thermistor resistance to the NTC pin. The AP2701AEN powers all circuit
down when the voltage at the NTC pin drops under the setting value shown below as
it is determined that LEDs are being heated. If this function is unnecessary, set
DET[2:0] “000” to turn off the function. (The default setting is OFF.)
Table 7. NTC Detection Voltage Setting
NTC2
NTC1
NTC0
NTC Pin Detection Voltage
0
0
0
off
0
0
1
0.60V
0
1
0
0.67V
0
1
1
0.74V
1
0
0
0.81V
1
0
1
0.88V
1
1
0
0.95V
1
1
1
1.02V
LIMITSEL: Peak Limit Setting of the Inductor when VOUT > 5V
Refer to Note 6
MS1607-E-00
- 25 -
2014/03