Diodes AP8803 Manuel d'utilisateur télécharger pdf (Page 3)

AP8803

Document number: DS31970 Rev. 5 - 2

3 of 10

www.diodes.com

August 2012

P8803

Recommended Operating Conditions (@T

= +25°C, unless otherwise specified.)

Symbol Parameter Min Max Unit

Operating Input Voltage 8.0 30 V

CTRLH

Voltage High 0.3 2.5 V

CTRLL

Voltage Low 0.25 V

Continuous Switch Current (Note 5) 1 A

Ambient Temperature Range -40 +125 °C

Duty Cycle Using Inductor ≥ 100µH (Note 4) 0.1 0.95

Notes: 4. For most applications the LED current will be within 8% 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.

5. Refer to Figure 8 for the device derating curve.

Electrical Characteristics (@T

= +25°C, unless otherwise specified.)

Symbol Parameter Conditions Min Typ Max Unit

INSU

Internal Regulator Start-Up Threshold V

rising 5.65 V

INSD

Internal Regulator Shutdown Threshold V

falling 5.55 V

Quiescent Current CTRL pin floating f = 250kHz 1.8 5 mA

THD

Internal Threshold Voltage 92 100 108 mV

SET

SET Pin Input Current V

SET

= V

-0.1 1.25 10 µA

REF

Internal Reference Voltage 1.25 V

DS(on)

On Resistance of MOSFET I

= 1A 0.5 1 Ω

Continuous Switch Current (Note 5) 1 A

SW_Leakage

Switch Leakage Current 8 µA

OSC

Switching Frequency 0.7 MHz

Thermal Resistance Junction-to-

Ambient

TSOT25 (Note 6) 125 °C/W

Notes: 5. Refer to Figure 8 for the device derating curve.

6. Test condition for TSOT25: Device mounted on FR-4 PCB, 25mm x 25mm, 2oz copper, minimum recommended pad layout on top layer and

thermal vias to bottom layer ground plane. For better thermal performance, larger copper pad for heat-sink is needed.

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