ZXSC440X8TA datasheet(9/16 Pages) ZETEX

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ZXSC440X8TA Datasheet(PDF) 9 Page - Zetex Semiconductors

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Layout issues

Layout is critical for the circuit to function in the most

efficient manner in terms of electrical efficiency,

thermal considerations and noise.

For 'step-up converters' there are four main current

loops, the input loop, power-switch loop, rectifier loop

and output loop. The supply charging the input

capacitor forms the input loop. The power-switch loop

is defined when Q1 is 'on', current flows from the input

through the transformer primary, Q1, RSENSE and to

ground. When Q1 is 'off', the energy stored in the

transformer is transferred from the secondary to the

output capacitor and load via D1, forming the rectifier

loop. The output loop is formed by the output capacitor

supplying the load when Q1 is switched back off.

To optimize for best performance each of these loops

kept separate from each other and interconnected with

short, thick traces thus minimizing parasitic

inductance, capacitance and resistance. Also the

RSENSE resistor should be connected, with minimum

trace length, between emitter lead of Q1 and ground,

again minimizing stray parasitics.

ZXSC440

SEMICO NDUC TORS

ISSUE 1 - JANUARY 2005

Manufacturer	Part #	Datasheet	Description
Zetex Semiconductors	ZXSC440X8TA	165Kb / 13P	PHOTOFLASH CHARGER
Diodes Incorporated	ZXSC440X8TA	161Kb / 16P	PHOTOFLASH CHARGER
	ZXSC440X8TA	483Kb / 17P	DC-DC BOOST SWITCHING CONTROLLERS
	ZXSC440X8TA	512Kb / 17P	DC-DC BOOST SWITCHING CONTROLLERS

Manufacturer	Part #	Datasheet	Description
Diodes Incorporated	ZXSC440	161Kb / 16P	PHOTOFLASH CHARGER
Zetex Semiconductors	ZXSC440	165Kb / 13P	PHOTOFLASH CHARGER
Aimtron Technology	AT1454	494Kb / 18P	Photoflash Capacitor Charger for DSC
Global Mixed-mode Techn...	G2109	25Kb / 1P	Photoflash Capacitor Charger for DSC
Aimtron Technology	AT1452	604Kb / 17P	Photoflash Capacitor Charger for DSC
Allegro MicroSystems	A8425	439Kb / 16P	High Current Photoflash Capacitor Charger
Aimtron Technology	AT1453	643Kb / 19P	Photoflash Capacitor Charger for DSC
Linear Technology	LT3468	302Kb / 12P	Photoflash Capacitor Charger in ThinSOT
Global Mixed-mode Techn...	G2132	25Kb / 1P	Photoflash Capacitor Charger for DSC
Aimtron Technology	AT1450	318Kb / 10P	Photoflash Capacitor Charger for DSC

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