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STK740-470 - 5V/5A Single Output Separate Excitation Chopper Regulator

General Description

Number Pin name Description No.6107 3/10 STK740-470 Test Circuit 12 11 10 9 8 7 6 5 4 3 2 1 ON/OFF Vo adjust DC INPUT C1 FB L1 C2 OUTPUT (5V) GND C1 C2 L1 FB : 47µF/25V (OS capacitor) : 1000µF/16V×2 : 30µH : Ferrite-bead core GND Overvoltage Protection Circuit In a constant-vo

Key Features

  • Adoption of Sanyo IMST ; Insulated Metal Substrate Technology, allows the circuit to be operated without using a heat sink (see “No Fin Output Current Derating” chart in the page 6).
  • Typical efficiency of 90% at DC 12V input, 2.5A output.
  • Fine adjustment of output voltage enable.
  • 50 kHz operating frequency.
  • Low-RON resistance power MOSFET adopted.
  • Low-VF Schottky barrier diode adopted. Any and all SANYO products described or contained.

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Ordering number:EN*6107 Thick Film Hybrid IC STK740-470 5V/5A Single Output Separate Excitation Chopper Regulator Preliminary Overview The STK740-470 is a separate-excitation step-down chopper regulator hybrid IC for the secondstage circuit. This IC incorporates in the package all the necessary circuits for a chopper regulator including power switch, error amplifier, soft start, shutdown type output short protection, low-voltage malfunction prevention, on/off, and snubber circuits. Therefore, external components required are input and output capacitors and a choke coil only and this allows this IC to be used to construct a large-current (5A) chopper regulator as if a 3-pin regulator were used. DC8V to 18V input voltage can be handled and up to 5A of output current is supported.