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AP8802H

60V 1A LED STEP-DOWN CONVERTER

AP8802H

Document number: DS32227 Rev. 6 - 2

3 of 14

www.diodes.com

May 2012

PRELIMINARY

NEW PRODUCT

Absolute Maximum Ratings (Note 4)

Symbol Parameter Rating Unit

pin Voltage

-0.3 to +65 V

SW Voltage -0.3 to +65 V

CTRL

CTRL Pin Input Voltage -0.3 to +6 V

SENSE

SET Voltage (Note 5) +0.3 to -5 V

Junction Temperature 150 °C

LEAD

Lead Temperature Soldering 300 °C

Storage Temperature Range -65 to +150 °C

Note: 4 All voltages unless otherwise stated are measured with respect to GND.

5. V

SENSE

is measured with respect to V

Caution: Stresses greater than the 'Absolute Maximum Ratings' specified above, may cause permanent damage to the device. These are stress ratings

only; functional operation of the device at conditions between maximum recommended operating conditions and absolute maximum ratings is not

implied. Device reliability may be affected by exposure to absolute maximum rating conditions for extended periods of time.

Semiconductor devices are ESD sensitive and may be damaged by exposure to ESD events. Suitable ESD precautions should be taken when

handling and transporting these devices.

Recommended Operating Conditions

Symbol Parameter Min Max Unit

Operating Input Voltage relative to GND 8.0 60.0 V

CTRLDC

Voltage range for 24% to 200% DC dimming relative to GND (Note 6) 0.3 2.5 V

CTRLL

Voltage Low for PWM dimming relative to GND 0 0.2 V

OSC

Maximum Switching Frequency (Note 7) — 625 kHz

Ambient Temperature Range -40 +125 °C

Duty Cycle Using Inductor ≥ 100µH (Note 8) 0.10 0.95 —

Notes: 6. For 100% brightness either leave floating or connect to 1.25V relative to GND.

7. AP8802H will operate at higher frequencies but accuracy will be affected due to propagation delays.

8. For most applications the LED current will be within 5% over the duty cycle range specified. Duty cycle accuracy is also dependent on

propagation delay. Smaller size inductors can be used but LED current accuracy may be greater than 8% at extremes of duty cycle. This is most

noticeable at low duty cycles (less than 0.1) or when the input voltage is high and only one LED is being driven.

Electrical Characteristics (V

= 12V, T

= +25°C, unless otherwise specified.)

Symbol Parameter Conditions Min Typ Max Unit

OUT

Continuous switch current (Note 9) — — 1 A

Quiescent Current - 75 120 μA

THD

Internal Threshold Voltage 190 200 210 mV

SENSEHYS

Sense threshold hysteresis — 15 — %

SET SET pin input current

SET

= V

-0.2

— 5 — μA

REF

Internal Reference Voltage — 1.25 — V

DS(ON)

On Resistance of MOSFET

= 0.8A

— 0.65 1.10 Ω

SW_LEAKAGE

Switch leakage current — - 8 μA

Thermal Resistance Junction-to-Ambient SO-8EP (Note 10) — 45 — °C/W

Thermal Resistance Junction-to-Case SO-8EP (Note 10) — 7 — °C/W

Notes: 9. Refer to figure 8 for the device derating curve.

10. Test condition for SO-8EP: Device mounted on FR-4 PCB, 2”x2”, 2oz copper, minimum recommended pad layout on top layer and thermal vias to

bottom layer ground plane. See Land pad diagram For better thermal performance, larger copper pad for heat-sink is needed.

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