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LT3468-1 Datasheet(PDF) 9 Page - Linear Technology |
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LT3468-1 Datasheet(HTML) 9 Page - Linear Technology |
9 / 12 page LT3468/LT3468-1/LT3468-2 9 sn346812 346812fs Table 2. Pre-Designed Transformers - Typical Specifications Unless Otherwise Noted. SIZE LPRI LPRI-LEAKAGE RPRI RSEC FOR USE WITH TRANSFORMER NAME (W × L × H) mm (µH) (nH) N (mΩ)(Ω) VENDOR LT3468/LT3468-2 SBL-5.6-1 5.6 × 8.5 × 4.0 10 200 Max 10.2 103 26 Kijima Musen LT3468-1 SBL-5.6S-1 5.6 × 8.5 × 3.0 24 400 Max 10.2 305 55 Hong Kong Office 852-2489-8266 (ph) kijimahk@netvigator.com (email) LT3468 LDT565630T-001 5.8 × 5.8 × 3.0 6 200 Max 10.4 100 Max 10 Max TDK LT3468-1 LDT565630T-002 5.8 × 5.8 × 3.0 14.5 500 Max 10.2 240 Max 16.5 Max Chicago Sales Office LT3468-2 LDT565630T-003 5.8 × 5.8 × 3.0 10.5 550 Max 10.2 210 Max 14 Max (847) 803-6100 (ph) www.components.tdk.com LT3468/LT3468-1 T-15-089 6.4 × 7.7 × 4.0 12 400 Max 10.2 211 Max 27 Max Tokyo Coil Engineering LT3468-1 T-15-083 8.0 × 8.9 × 2.0 20 500 Max 10.2 675 Max 35 Max Japan Office 0426-56-6262 (ph) www.tokyo-coil.co.jp 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 − = 10 . (LT3468-2) I N PK SEC − = 07 . (LT3468-1) For the circuit of Figure 6 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/LT3468-2 applications. Another option is to use the BAV23S dual silicon diodes. Toshiba makes a dual diode named 1SS306 which also meets all the requirements. The CRF02 is a single diode with an 800V reverse voltage rating which is also suitable. Table 3 shows the various diodes and relevant specifications. Use the appropriate number of diodes to achieve the necessary reverse breakdown volt- age. SW Pin Clamp Diode Selection The diode D2 in Figure 6 is needed to clamp the SW node. Due to the new control scheme of the LT3468/LT3468-1/ LT3468-2, the SW node may go below ground during a switch cycle. The clamp diode prevents the SW node from 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 CRF02 1x800 500 Not Specified www.semicon.toshiba.co.jp APPLICATIO S I FOR ATIO |
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