Instruction Manual

Test Setup

3-3

Test Results

3.1.2 Analog Dimming Test

For analog dimming, enable the open-lamp detection by connecting pin 1 to

pin 2 of jumper JP1. A power supply that has a power capability of 6 V/0.5 A

is required for this test. Figure 3–2 shows the input/output connections to the

SLUP178. The lamp intensity is controlled by V

(0~3 Vdc). Make sure the

wire of the lamp is as short as possible and the lamp reflector (if there is one)

is grounded to board ground. Do not let the high voltage wire cross any part

of the board.

Figure 3–2. Test Setup for Analog Dimming

Power Supply

CCFL

Lamp