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LM25115 bảng dữ liệu(PDF) 3 Page - National Semiconductor (TI) |
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LM25115 bảng dữ liệu(HTML) 3 Page - National Semiconductor (TI) |
3 / 17 page Pin Descriptions (Continued) Pin Name Description Application Information 9 SYNC Synchronization input A low impedance current input pin. The current into this pin sets the RAMP capacitor charge current and the frequency of an internal oscillator that provides a clock for the free-run (DC input) mode . 10 PGND Power Ground Connect directly to the analog ground pin (AGND). 11 LO Low side gate driver output Connect to the gate of the low side synchronous MOSFET through a short, low inductance path. 12 VCC Output of bias regulator Nominal 7V output from the internal LDO bias regulator. Locally decouple to PGND using a low ESR/ESL capacitor located as close to controller as possible. 13 HS High side MOSFET source connection Connect to negative terminal of the bootstrap capacitor and the source terminal of the high side MOSFET. 14 HO High side gate driver output Connect to the gate of high side MOSFET through a short, low inductance path. 15 HB High side gate driver bootstrap rail Connect to the cathode of the bootstrap diode and the positive terminal of the bootstrap capacitor. The bootstrap capacitor supplies current to charge the high side MOSFET gate and should be placed as close to controller as possible. 16 VBIAS Supply Bias Input Input to the LDO bias regulator and current sense amplifier that powers internal blocks. Input range of VBIAS is 4.5V to 30V. - Exposed Pad (LLP Package Only) Exposed Pad, underside of LLP package Internally bonded to the die substrate. Connect to system ground for low thermal impedance. www.national.com 3 |
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