AP2152 Datasheet, PDF (4/18 Pages) Asahi Kasei Microsystems – 3CH High Power WLED Driver

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Pin No.
12
13
14
15
16
17
18
19
20
-
Pin Name
RT
ISET
TM
PGOOD
NC
CH3
CH2
CH1
GND
THERMAL
PAD
Function
Switching frequency set pin. Oscillation frequency can be set by connecting a resistor
between the RT pin and GND. Please refer to section 2.4 “Switching frequency
setting/Function of synchronizing with external clock”.
LED driving current set pin. LED current can be set by connecting a resistor between the
ISET pin and GND. Please refer to section 2.3 “LED current setting”.
Capacitor connection pin for timer. If an abnormality occurs in the IC, this pin outputs
10µA constant current. If this pin voltage exceeds 2.0V, the IC ceases its operation. By
returning to the standby state, the timer is reset and the IC can be released. When the
timer is unnecessary, please connect to GND. Please refer to section 2.6 “Timer latch (TM)
setting”.
Power Good pin. N channel open-drain, it keeps OFF when normal operation. If an
abnormality occurs in the IC, the operation is latched off by timer latch function and
internal FET turns ON. Please refer to “Protections description” for the detail of Power
Good pin status described later. When the power good function is unnecessary, please
connect to GND.
NC pin.
WLEDs constant current circuit 3. CH3 is open drain, and provides constant current to the
LEDs. If this constant current channel is unnecessary, please keep this pin open.
WLEDs constant current circuit 2. CH2 is open drain, and provides constant current to
LEDs. If this constant current channel is unnecessary, please keep this pin open.
WLEDs constant current circuit 1. CH1 is open drain, and provides constant current to
LEDs. If this constant current channel is unnecessary, please keep this pin open.
GND pin for internal circuits.
For heat radiation, connection to GND is recommended.
This is electrically isolated from the internal circuit.
ABSOLUTE MAXIMUM RATINGS
Rating
Symbol
Value
Unit
Condition
VIN voltage
VIN
LX, CH1-3 Voltage
VLX,
VCH
SDATA, SCLK, PWM,VDC,
PGOOD, SYNC voltage
-
-0.3 to +45
-0.3 to +45
-0.3 to +6
V
*1
V
*1
V
*1
OVP, COMP, RT,
ISET, TM, CLKO voltage
-
-0.3 to (VDC + 0.3)
V
*1*4
CH1-3 current
ICH
140
mA
PGOOD current
Power Dissipation
Operating Temperature Range
IGOOD
PD
TOP
20
2500
-40 ~ +105
mA
mW *2, *3
°C
Storage Temperature Range
TSTG
-55 ~ +150
°C
Note:
*1. All voltages refer to GND pin (GND, PGND) as zero (reference) voltage.
*2. PD must be decreased at the rate of 23.3mW/°C for operation above 25°C.
*3. Mounted on a 50 mm × 50 mm x 1 mm double sided FR-4 board.
*4. The maximum value is limited to 6.0V if VDC exceeds 5.7V.
Note：The maximum ratings are the absolute limitation values with the possibility of damage/breakage.
When operation exceeds this standard, quality cannot be guaranteed.
MS1348-E-00
4
2012/05