Toshiba TLP510E, TLP511E, TLP510U, TLP511U Lamp Power Supply Circuit Lamp Driver, Configuration

2.LAMP POWER SUPPLY CIRCUIT (LAMP DRIVER)

2-1. Configuration

The lamp power supply cicrcuit receives a DC220 to 390V (primary side) from the system power supply and provides a AC voltage (70 to 100VAC at ever turning on the lamp) to turn on the lamp. Fig. 2-1-1 shows the block diagram.

		Lamp Driver
	L1				L1
		Stabilizer	Commu-		Igniter
			tator
Power input	R1				L2
	C1
	C2				Lamp
			Control
		I122			Mains
	Rs			I121	isolated
		Cs
		1K	100nF
	CB3	CB2-1	CB2-2
	EMC GND	SCI
	(optional)
			Common	Flag

Fig. 2-1-1

The DC voltage is supplied to CB1 from the main power supply unit through an interlock switch. This voltage

becomes AC input x 2Ö2 (= 340V for AC120V input) when the lamp is off. CB2 is a connector for the lamp on control signal input (SCI) and lamp off control signal output (FLAG). When +5V is applied to SCI (CB2-1) in the standby on, I122 FET transistor turns on, the igniter develops a high voltage pulse (5 to 25 kV), and the lamp starts to light up.

The pulse normally continues to be developed until the lamp turns on (for max. 3s.). But if the lamp does not turn on, I121 does not turn on, the voltage of CB2-3 develops high. I121 turns on and develops low after the lamp turned on, the igniter circuit stops the operation. Then the AC70 to 100V is applied to the lamp.

2-1