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LCS700HG Datasheet(PDF) 3 Page - Power Integrations, Inc. |
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LCS700HG Datasheet(HTML) 3 Page - Power Integrations, Inc. |
3 / 26 page Rev. B 062011 3 LCS700-708 www.powerint.com Pin Functional Description VCC Pin IC power pin. In a typical application, VCC is connected to the 12 V system standby supply via a 5 W resistor. This resistor helps provide filtering and improves noise immunity. Note: The system standby supply return should be connected to the B- bus and not to the GROUND pin. VREF Pin 3.4 VREF pin. An internal voltage reference network used as a voltage source for FEEDBACK pin and DT/BF pin pull-up resistor. GROUND (G) Pin G is the return node for all analog small signals. All small signal pin bypass capacitors must be returned to this pin through short traces, with the exception of the D-S high-voltage bypass capacitor, and the VCCH bypass capacitor. It is internally connected to the SOURCE pins to provide a star connection. Do not connect the GROUND pin to the SOURCE pins, nor to the B- bus, in the PCB layout. OV/UV Pin Overvoltage/Undervoltage pin. B+ is sensed by this pin through a resistor divider. The OV/UV pin implements brown-in, brown-out, and overvoltage lockout with hysteresis. Pulling this pin down to ground will implement a remote-off function. FEEDBACK (FB) Pin Current fed into this pin determines LLC switching frequency; higher current programs higher switching frequency. The pin V-I characteristic resembles a diode to ground during normal switching. An RC network between the VREF pin and FEEDBACK pin determines the minimum operating frequency, start-up frequency, soft-start time, and delay before start-up. DEAD-TIME/BURST FREQUENCY (DT/BF) Pin A resistor divider from VREF to ground programs dead-time, maximum switching frequency at start-up, and burst-mode threshold frequencies. CURRENT-SENSE (IS) Pin The CURRENT-SENSE pin is used for sensing transformer primary current, to detect overload and fault conditions, through a current sense resistor or a capacitive divider plus sense resistor circuit. It resembles a reverse diode to ground, and does not require a rectifier circuit for preventing negative pulses from reaching the pin, provided the reverse current is limited to <5 mA. Figure 3. Pin Numbering and Designation. SOURCE (S1), (S2) Pins SOURCE pins of internal low-side MOSFET. These should be connected together on the PCB, and connected to the B- from the PFC bulk capacitor or input high-voltage DC return. HB Pin This is the output of the half-bridge connected MOSFETs (Source of high-side MOSFET, Drain of low-side MOSFET), to be connected to the LLC power train (transformer primary and series resonant capacitor). VCCH Pin Floating bootstrap supply pin for the LLC high-side driver. This pin is referenced to the HB pin, which in turn is internally connected to the SOURCE pin of the high-side MOSFET. A bypass/storage capacitor between VCCH and HB pins, and a boot strap diode with a series resistor from the standby supply, are required. The storage capacitor is refreshed every time the lower MOSFET turns on or its body diode conducts. DRAIN (D) Pin DRAIN pin of the internal high-side MOSFET. This connects to the B+ from the PFC bulk capacitor or input high-voltage DC bus. PI-5636-051311 H Package (eSIP-16C) 16 1314 11 910 8 1 3 4 5 6 7 Exposed Pad (Backside) Internally Connected to GROUND Pin (see eSIP-16C Package Drawing) Exposed Metal (On Package Edge) Internally Connected |
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Similar Description - LCS700HG |
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