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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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LT3468-2 Fiches technique(PDF) 6 Page - Linear Technology |
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LT3468-2 Fiches technique(HTML) 6 Page - Linear Technology |
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6 / 12 page  LT3468/LT3468-1/LT3468-2 6 sn346812 346812fs SW (Pin 1): Switch Pin. This is the collector of the internal NPN Power switch. Minimize the metal trace area con- nected to this pin to minimize EMI. Tie one side of the primary of the transformer to this pin. The target output voltage is set by the turns ratio of the transformer. Choose Turns Ratio N by the following equation: N VOUT = + 2 31 5 . Where: VOUT is the desired output voltage. You must tie a Schottky diode from GND to SW, with the anode at GND for proper operation of the circuit. Please refer to the applications section for further information. GND (Pin 2): Ground. Tie directly to local ground plane. DONE (Pin 3): Open NPN Collector Indication Pin. When target output voltage is reached, NPN turns on. This pin needs a pull-up resistor or current source. CHARGE (Pin 4): Charge Pin. This pin must be brought high (>1V) to enable the part. A low (<0.3V) to high (>1V) transition on this pin puts the part into power delivery mode. Once the target output voltage is reached, the part will stop charging the output. Toggle this pin to start charging again. Ground to shut down. You may bring this pin low during a charge cycle to halt charging at any time. VIN (Pin 5): Input Supply Pin. Must be locally bypassed with a good quality ceramic capacitor. Input supply must be 2.5V or higher. PI FU CTIO S BLOCK DIAGRA VIN SW + DONE CHARGE C1 T1 R2 60k Q1 ENABLE COUT PHOTOFLASH CAPACITOR 36mV 20mV TO BATTERY D2 Q2 VOUT D1 LT3468: RSENSE = 0.015Ω LT3468-2: RSENSE = 0.022Ω LT3468-1: RSENSE = 0.03Ω 3486 BD 1 GND 5 3 4 2 + – – + – + – + +– ONE- SHOT ONE- SHOT DRIVER PRIMARY SECONDARY MASTER LATCH RSENSE DCM COMPARATOR VOUT COMPARATOR R1 2.5k S RQ 1.25V REFERENCE Q3 Q1 QQ SR A3 A1 A2 CHIP ENABLE Figure 1 |
Numéro de pièce similaire - LT3468-2 |
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Description similaire - LT3468-2 |
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