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LM5035MH 数据表(PDF) 4 Page - National Semiconductor (TI) |
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LM5035MH 数据表(HTML) 4 Page - National Semiconductor (TI) |
4 / 28 page Pin Descriptions (Continued) TSSOP PIN LLP PIN Name Description Application Information 10 9 RES Restart Timer If cycle-by-cycle current limit is exceeded during any cycle, a 22µA current is sourced to the RES pin capacitor. If the RES capacitor voltage reaches 2.5V, the soft-start capacitor will be fully discharged and then released with a pull-up current of 1.2µA. After the first output pulse at LO (when SS > COMP offset, typically 1V), the SS pin charging current will revert to 55µA. 11 11 HB Boost voltage for the HO driver An external diode is required from VCC to HB and an external capacitor is required from HS to HB to power the HO gate driver. 12 12 HS Switch node Connection common to the transformer and both power switches. Provides a return path for the HO gate driver. 13 13 HO High side gate drive output. Output of the high side PWM gate driver. Capable of sinking 2A peak current. 14 14 LO Low side gate drive output. Output of the low side PWM gate driver. Capable of sinking 2A peak current. 15 15 PGND Power Ground Connect directly to Analog Ground. 16 16 VCC Output of the high voltage start-up regulator. The VCC voltage is regulated to 7.6V. If an auxiliary winding raises the voltage on this pin above the regulation setpoint, the Start-up Regulator will shutdown, thus reducing the internal power dissipation. 17 17 SR2 Synchronous rectifier driver output. Control output of the synchronous FET gate. Capable of 0.5A peak current. 18 18 SR1 Synchronous rectifier driver output. Control output of the synchronous FET gate. Capable of 0.5A peak current. 19 19 REF Output of 5V Reference Maximum output current is 20mA. Locally decoupled with a 0.1µF capacitor. 20 21 VIN Input voltage source Input to the Start-up Regulator. Operating input range is 13V to 100V with transient capability to 105V. For power sources outside of this range, the LM5035 can be biased directly at VCC by an external regulator. EP EP EP Exposed Pad, underside of package No electrical contact. Connect to system ground plane for reduced thermal resistance. 1 NC No connection No electrical contact. 10 NC No connection No electrical contact. 20 NC No connection No electrical contact. 22 NC No connection No electrical contact. www.national.com 4 |
类似零件编号 - LM5035MH |
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类似说明 - LM5035MH |
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