LTC3405 Просмотр технического описания (PDF) - Linear Technology

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LTC3405

Photoflash Capacitor Chargers with Automatic Refresh

Linear Technology 

LT3420/LT3420-1

APPLICATIO S I FOR ATIO

BOARD LAYOUT

The high voltage operation of the LT3420/LT3420-1

demands careful attention to board layout. You will not

get advertised performance with careless layout. Fig-

ure␣ 11 shows the recommended component placement.

Keep the area for the high voltage end of the secondary

as small as possible. Note the larger than minimum

spacing for all high voltage nodes. This is necessary to

meet the breakdown specifications for the circuit board.

If the Photoflash capacitor is placed far from the LT3420/

LT3420-1 circuit, place a small (20nF-50nF) ceramic

capacitor with sufficient voltage rating close to the part.

This insures adequate bypassing. Remember that

LETHAL VOLTAGES ARE PRESENT in this circuit. Use

caution when working with the circuit.

R2

VCC

C2

GND

C1

CHARGE DONE

C3

PHOTOFLASH

CAPACITOR

R1

T1

VOUT

VBAT

D1B

D1A

3420 F11

Figure 11. Suggested Layout

3420fa

15

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