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LTC3901EGN Datasheet(PDF) 6 Page - Linear Technology |
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LTC3901EGN Datasheet(HTML) 6 Page - Linear Technology |
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6 / 16 page  LTC3901 6 3901f BLOCK DIAGRA APPLICATIO S I FOR ATIO Figure 2. Push-Pull Converter Switching Waveforms SYNC AND DRIVER LOGIC ISE S– S+ SYNC+ SYNC– TMR –1.4V +1.4V DISABLE DRIVER UVLO ZTMR 0.5 • VCC ZCSE 11V 7 5 6 9 3 16 SYNC CSE+ CSE– ISF ZCSF 11V 12 11 CSF+ CSF– TIMER MTMR R1 180k R2 45k TIMER RESET ME PGND GND GND MF PGND VCC 1 PVCC 14 4 13 10 8 3901 BD + – + – 10.5mV 10.5mV DRVA DRVB SDRA SDRB SYNC ME 3901 F02 MF 0V Overview Push-pull and full bridge converters use power transform- ers to provide input-to-output isolation and voltage step- up/down. Diodes are used as a simple solution for second- ary side rectification. Unfortunately, as output currents increase, the loss associated with diode forward voltage drop results in low overall efficiency. The LTC3901 over- comes this problem by providing control and drive for two external N-channel synchronous MOSFETs. Synchroniza- tion to the primary side controller is maintained through a small signal transformer. Figure 1 shows a simplified push-pull converter applica- tion. T1 is the power transformer; MA and MB are the primary side power transistors driven by the LTC3723 controller’s DRVA and DRVB outputs. The gate drive transformer T2 is driven by the LTC3723’s SDRA and SDRB outputs and provides the synchronization signal to the LTC3901 on the secondary side. When both SDRA and SDRB are high, there is no voltage across the transformer’s primary and the LTC3901 SYNC input is approximately 0V. According to the polarity of the transformer: if SDRA goes low while SDRB is high, SYNC is positive; if SDRB goes low while SDRA is high, SYNC is negative. ME and MF are the secondary side synchronous switches driven by the LTC3901’s ME and MF output. Inductor L1 and capacitor COUT form the output filter, providing DC output voltage to the load. The feedback path from VOUT through the opto- coupler driver and optocoupler back to the primary side controller is also shown in Figure 1. Each full cycle of the push-pull converter consists of four distinct periods. Figure 2 shows the push-pull converter waveforms. |
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