P-SLED In Constant Current Circuit Application

Views: 0 Author: Site Editor Publish Time: 2023-10-17 Origin: Site

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With the steady improvement of LED technology, high-end mainstream industrial and mining lights, tunnel lights and signage lighting and other applications are using LED lighting technology.For high-quality products, the requirements of cost-effective, essential for the protection of the LED failure, our company for this application developed P-Thyristor protection tube.P-SLED series of products to provide SMA (Do-214AC), SMB (Do-214AA) compact and diversified packages, easy to use production.

I.Product application advantages

Extend LED life
Protect LED parallel stage capacitance, reduce capacitance size
Improve stability and EMC performance

II.typical application scenarios

III.application topology

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IV.LED bead string and voltage relationship

Specification	LED Voltage	Electrolytic Capacitor Withstanding Voltage	Electrolytic Capacitor Upper Limit Voltage	P-SLED
3L ( 3*9V)	27V	35V	43.75V	27V<Vp<43.75
4L	36V	50V	62.5V	50V<Vp<62.5V
5L	45V	50V	62.5V	50V<Vp<62.5V
6L	54V	63V	78.25	64V<Vp<78.25
7L	63V	80V	100.0V	80V<Vp<100.0V
8L	72V	100V	125.0V	72V<Vp<125.0V

V.application notes

The above application circuit using a constant current source power supply, most constant current circuits on the market only over-voltage protection, short-circuit protection, over-temperature protection, and there is no open-circuit protection, when one of the LED string of open-circuit failure, the circuit will generate surge voltages, the use of shunt capacitors will soon be short-circuited, which will blow up capacitors caused by fires and other unexpected failure, a serious life-threatening hazards.

VI.product characterization

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Description:

Unipolar P-SLEDs solve the problem of ultra-low leakage current, which we have to consider as Ir is close to zero, for enclosed LED products, avoiding the heat source.

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V-I operating characteristics：

The operating characteristics of Quadrant 1 are shown on the left.

The operating characteristics of the third quadrant are VF forward compression characteristics.

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Vt and It curve relationship

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Vbr vs. T temperature curve relationship

VII.electrical parameters（Ta：25℃）

P/N	IDRM@VDRM PN2-1		IDRM2@VDRM ① PN2-1		VBO② @IBO PN2-1		VBR@IBR PN2-1		VT @IT PN2-1		IH PN2 -1	Co③ PN2- 1	VBR@IBR PN1-2
	uA	V	uA	V	V	mA	V	mA	V	A	mA	pF	V	mA
	Max	Min	Max	Min	Max	Max	Min	Max	Max	Max	Max	Max	Max	Max
PSLED0321	1	28	50	28	40	200	28	1	1.8	2.2	30	80	18	1
PSLED0401	1	33	50	33	48	200	33	1	1.8	2.2	30	80	18	1
PSLED0501	1	53	50	53	60	200	53	1	1.8	2.2	30	80	18	1
PSLED0641	1	60	50	60	80	200	60	1	1.8	2.2	30	80	18	1
PSLED0721	1	75	50	75	88	200	75	1	1.8	2.2	50	150	18	1
PSLED0901	1	85	50	85	100	200	85	1	1.8	2.2	50	150	18	1
PSLED1101	1	95	50	95	115	200	95	1	1.8	2.2	50	150	18	1