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LT3468 Datasheet(PDF) 9 Page - Linear Technology |
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LT3468 Datasheet(HTML) 9 Page - Linear Technology |
9 / 12 page LT3468/LT3468-1 9 34681i APPLICATIO S I FOR ATIO Capacitor Selection For the input bypass capacitor, a high quality X5R or X7R type should be used. Make sure the voltage capability of the part is adequate. Output Diode Selection The rectifying diode(s) should be low capacitance type with sufficient reverse voltage and forward current rat- ings. The peak reverse voltage that the diode(s) will see is approximately: VV N V PK R OUT IN − =+ () • The peak current of the diode is simply: I N PK SEC − = 14 . (LT3468) I N PK SEC − = 07 . (LT3468-1) Table 3. Recommended Output Diodes MAX REVERSE VOLTAGE MAX FORWARD CONTINUOUS CURRENT CAPACITANCE PART (V) (mA) (pF) VENDOR GSD2004S 2x300 225 5 Vishay (Dual Diode) (402) 563-6866 www.vishay.com BAV23S 2x250 225 5 Philips Semiconductor (Dual Diode) (800) 234-7381 www.philips.com 1SS306 2x250 100 3 Toshiba (Dual Diode) (949) 455-2000 www.semicon.toshiba.co.jp For the circuit of Figure 1 with VIN of 5V, VPK-R is 371V and IPK-SEC is 137mA. The GSD2004S dual silicon diode is recommended for most LT3468/LT3468-1 applications. Another option is to use the BAV23S dual silicon diodes. Toshiba makes a dual diode named 1SS306 which also meets all the requirements. Table 3 shows the various diodes and relevant specifications. Use the appropriate number of diodes to achieve the necessary reverse break- down voltage. SW Pin Clamp Diode Selection The diode D2 in Figure 1 is needed to clamp the SW node. Due to the new control scheme of the LT3468/LT3468-1, the SW node may go below ground during a switch cycle. The clamp diode prevents the SW node from going too far below ground. The diode is required for proper opera- tion of the circuit. The recommended diode should be a Schottky diode with at least a 500mA peak forward current capability. Reverse voltage rating should be 40V or higher. Table 4 shows various recommended clamping diodes. 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 |
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