AP3064 datasheet(10/20 Pages) DIODES

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AP3064

Document number: DS37485 Rev. 2 - 2

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www.diodes.com

September 2015

AP3064

Application Information (Cont.)

(5) Over Temperature Protection

(6) Schottky Diode Short Protection

(7) VOUT Short/Open Schottky Diode Protection

6. Over Voltage Protection

The AP3064 integrates an OVP circuit. The OVP pin is connected to the center tap of voltage-divider (ROV1 and ROV2) that placed between high

voltage output and GND. If the voltage on OVP pin exceeds 2.0V, which may results from open loop or excessive output voltage, all the functions

of AP3064 will be disabled with output voltage falling. The OVP hysteresis is 250mV. The formulas of OVP can be expressed as below:

OV2

OV1

OVP

2.0V

)







7. Over Current Protection

The AP3064 integrates an OCP circuit. The CS pin is connected to the voltage-sensor (RCS) that placed between the Drain of MOS and GND. If

the voltage on CS pin exceeds 0.54V, it is turned off immediately and will not turn on until the next cycle begins.

8. LED Short-Circuit Protection

The AP3064 integrates an LED Short-circuit protection circuit. If the voltage at any of the CH1-4 pins exceeds a threshold of approximately 7.3V

during normal operation, the corresponding string is turned off and is latched off. Toggle VIN and/or EN to reset the latch. LED short detecting logic

priority is lower than open LED and OVP logic. The LED short detecting is triggered when 0.1V<VLED_MIN under dimming on mode, disabled when

LED open occurs until output voltage resumes to the regulated voltage.

9. LED Open-circuit Protection

The AP3064 integrates an LED Open-circuit Protection circuit. When any LED string is open, VOUT will boost up until the voltage at OVP pin

reaches an approximate 2.0V threshold. The IC will automatically ignore the open string whose corresponding pin voltage is less than 100mV and

the remaining string will continue operation. If all the strings are open and the voltage at OVP reaches a threshold of 2.0V, the MOSFET drive

GATE will turn off and IC will shut down and latch.

10. VOUT Short / Open Schottky Diode Protection

The AP3064 monitors the OVP pin, if the OVP pin voltage is less than 0.1V, MOSFET drive output will turn off. This protects the converter if the

output Schottky diode is open or VOUT is shorted to ground.

11. Under Voltage Lockout

The AP3064 provides an under voltage lockout circuit to prevent it from undefined status when startup. The UVLO circuit shuts down the device

when VCC drops below 3.6V. The UVLO circuit has 200mV hysteresis, which means the device starts up again when VCC rise to 3.8V.

12. Over Temperature Protection

The AP3064 features Over Temperature Protection, if the junction temperature exceeds approximately +160ºC, the IC will shut down until the

junction temperature is less than approximately +140ºC. When the IC is released from over temperature shutdown, it will start a soft-start process.

13. Schottky Diode/Inductor Short Circuit Protection

The AP3064 features Schottky diode/inductor short-circuit protection circuit. When CS pin voltage exceeds 0.8V for greater than 16 switching

clocks, the IC will latch. The voltage of CS is monitored after a short delay of LEB.

14. Shut Down under Abnormal Condition

The AP3064 features shutdown under abnormal condition protection circuit. When OVP pin voltage exceeds 3.2V, the IC will latch. Toggle EN to

restart the IC. This feature can be used for any other protection to shut down the IC.

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