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IRDC3853 Datasheet(PDF) 2 Page - International Rectifier |
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IRDC3853 Datasheet(HTML) 2 Page - International Rectifier |
2 / 17 page IRDC3853 07/21/10 2 A well regulated +12V input supply should be connected to VIN+ and VIN-. A maximum 4A load should be connected to VOUT+ and VOUT-. The connection diagram is shown in Fig. 1 and inputs and outputs of the board are listed in Table I. IR3853 has two input supplies, one for biasing (Vcc) and the other as input voltage (Vin). Separate supplies should be applied to these inputs. Vcc input should be a well regulated 4.5V-5.5V supply and it would be connected to Vcc+ and Vcc-. If single 12V application is required connect R7 (zero Ohm resistor) which enables the on board bias regulator (see schematic). In this case there is no need of external Vcc supply. The output can track a sequencing input at the start-up. For sequencing application, R16 should be removed and the external sequencing source should be applied between Seq. and Agnd. The value of R14 and R28 can be selected to provide the desired ratio between the output voltage and the tracking input. For proper operation of IR3853, the voltage at Seq. pin should not exceed Vcc. CONNECTIONS and OPERATING INSTRUCTIONS LAYOUT The PCB is a 4-layer board. All of layers are 2 Oz. copper. The IR3853 SupIRBuck and all of the passive components are mounted on the top side of the board. Power supply decoupling capacitors, the Bootstrap capacitor and feedback components are located close to IR3853. The feedback resistors are connected to the output voltage at the point of regulation and are located close to the SupIRBuck. To improve efficiency, the circuit board is designed to minimize the length of the on-board power ground current path. Table I. Connections External Synchronization Clock SYNC Sequence Input Seq. V out (+1.8V) VOUT+ Ground for Vcc input Vcc- Vcc input Vcc+ Enable Enable Power Good Signal PGood Ground of V out VOUT- Ground of V in VIN- V in (+12V) VIN+ Signal Name Connection |
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