AL8807EV3

Issue 1 – December 2011

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© Diodes Incorporated 2011

3

ORDERING INFORMATION

EVALBOARD ORDER

NUMBER

AL8807EV3

Please note: Evaluation boards are subject to

availability and qualified sales leads.

DEVICE ORDER NUMBER

AL8807MP-13

AL8807EV3 EVALUATION BOARD REFERENCE DESIGN

The AL8807EV3 is configured to the reference design in Figure 2.

The operating voltage is up to 36V. The nominal current is set at 1A with a 0R1 sense resistor R1.

The circuit operates in continuous mode between approximately 40kHz and 130kHz, depending on

the input voltage, and with a 68uH inductor and one LED.

Both DC and PWM dimming can be achieved by driving the CTRL pin. For DC dimming, the CTRL pin

Driving the CTRL pin below 0.4V will shut down the output current.

A PWM signal (low level ≤ 0.4V and high level > 2.5) allows the output current to be adjusted above or

below the level set by the resistor connected to SET input pin. The PWM frequency can be around

100Hz to 1kHz, providing a resolution of 10 bits.

For low frequency PWM, C2 should be removed from the evaluation board, to give a more accurate

duty cycle .

Shorting R2 will connect the test pin CTRL to device pin CTRL, if required.

For other reference designs or further applications information, please refer to the AL8807 datasheet.

Figure 2: Schematic diagram