AP3064 datasheet(9/20 Pages) DIODES

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AP3064

Document number: DS37485 Rev. 2 - 2

9 of 20

www.diodes.com

September 2015

AP3064

Performance Characteristics (Cont. VIN=24V, VEN=VDD=5V, 13 LEDs in series, 4 strings in parallel, 120mA/string, TA=+25°C,

unless otherwise specified.)

VOUT Short/Diode Open Protection

Over Temperature Protection

Application Information

1. Enable

The AP3064 is enable when the voltage to EN is greater than approximately 2.4V, disabled when lower than 0.5V.

2. Frequency Selection

An external resistor RT, placed between RT pin and GND, can be used to set the operating frequency. The operating frequency ranges from

100kHz to 1MHz. The high frequency operation optimizes the regulator for the smallest-sized component application, while low frequency

operation can help to reduce switch loss. The approximate operating frequency can be expressed as below:

]

[

]

[



MHz

OSC

3. LED Current Setting

The maximum LED current per channel can be adjusted up to 18

0mA via ISET pin. When ≥180mA current is needed in application, two or more

channels can be paralleled to provide larger drive current. Connect a resistor RISET between ISET pin and GND to set the reference current ISET.

The LED current can be expressed as below:

]

[

1200

]

[



ISET

LED

4. Dimming Control

Applying a PWM signal to DIM pin to adjust the LED current, that means, the LED current of all enabled channels can be adjusted at the same

time and the LED brightness can be adjusted from 1%× ICHX_MAX to 100%×ICHX_MAX. During the “high level” period of PWM signal, the LED is

turned on and 100% of the current flows through LED, while during the “low level” period of the PWM signal, the LED is turned off and almost no

current flows through the LED, thus changing the average current through LED and finally adjusting LED brightness. The external PWM signal

frequency applied to PWM pin is allowed to be 100Hz or higher.

5. Status Output

After IC is enabled, STATUS will output logic low if any of the following conditions exists:

(1) Any String is Open

(2) LED Short Circuit Protection

(3) Shut Down Under Abnormal Condition

(4) Over Voltage Protection

VOVP

5V/div

VIN

10V/div

VGATE

5V/div

ICH

50mA/div

Time 5ms/div

VSTATUS

5V/div

VSW

50V/div

VOUT

50V/div

ICH

50mA/div

Time 1s/div

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