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LT3468-1 Datasheet(PDF) 10 Page - Linear Technology |
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LT3468-1 Datasheet(HTML) 10 Page - Linear Technology |
10 / 12 page LT3468/LT3468-1/LT3468-2 10 346812fa Board Layout The high voltage operation of the LT3468/LT3468-1/ LT3468-2 demands careful attention to board layout. You will not get advertised performance with careless layout. Figure 5 shows the recommended component placement. Keep the area for the high voltage end of the secondary as small as possible. Also note the larger than minimum spacing for all high voltage nodes in order to meet break- down voltage requirements for the circuit board. It is imperative to keep the electrical path formed by C1, the primary of T1, and the LT3468/LT3468-1/LT3468-2 as short as possible. If this path is haphazardly made long, it will effectively increase the leakage inductance of T1, which may result in an overvoltage condition on the SW pin. APPLICATIO S I FOR ATIO Figure 5. Suggested Layout: Keep Electrical Path Formed by C1, Transformer Primary and LT3468/LT3468-1/LT3468-2 Short D2 R1 D1 (DUAL DIODE) C1 COUT PHOTOFLASH CAPACITOR T1 VIN CHARGE DONE + • 4 5 3 2 1 3468 F05 Table 4. Recommended Clamp Diodes MAX REVERSE VOLTAGE PART (V) VENDOR ZHCS400 40 Zetex (631) 360-2222 www.zetex.com B0540W 40 Diodes Inc. (805) 446-4800 www.diodes.com MA2Z720 40 Panasonic (408) 487-9510 www.panasonic.co.jp TYPICAL APPLICATIO S should be a Schottky diode with at least a 500mA peak forward current capability. The diode forward voltage drop should be 600mV or less at 500mA of forward current. Reverse voltage rating should be 40V or higher. Table 4 shows various recommended clamping diodes. LT3468 CHARGE GND VIN SW + DONE DONE CHARGE C1 4.7µF R1 100k T1 1:10.2 VIN 2.5V TO 8V 320V 1 2 4 5 3468 F06 D2 COUT PHOTOFLASH CAPACITOR C1: 4.7µF, X5R OR X7R, 10V T1: KIJIMA MUSEN PART# SBL-5.6-1, LPRI = 10µH, N = 10.2 D1: VISHAY GSD2004S DUAL DIODE CONNECTED IN SERIES D2: ZETEX ZHCS400 OR EQUIVALENT R1: PULL UP RESISTOR NEEDED IF DONE PIN USED D1 LT3468-1 CHARGE GND VIN SW + DONE DONE CHARGE C1 4.7µF R1 100k T1 1:10.2 COUT PHOTOFLASH CAPACITOR VIN 2.5V TO 8V D2 320V D1 4 3 5 6 C1: 4.7µF, X5R OR X7R, 10V T1: KIJIMA MUSEN PART# SBL-5.6S-1, LPRI = 24µH, N = 10.2 D1: VISHAY GSD2004S DUAL DIODE CONNECTED IN SERIES D2: ZETEX ZHCS400 OR EQUIVALENT R1: PULL UP RESISTOR NEEDED IF DONE PIN USED 3468 F07 Figure 6. LT3468 Photoflash Charger Uses High Efficiency 4mm Tall Transformer Figure 7. LT3468-1 Photoflash Charger Uses High Efficiency 3mm Tall Transformer |
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