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L6712QTR Datasheet(PDF) 7 Page - STMicroelectronics |
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L6712QTR Datasheet(HTML) 7 Page - STMicroelectronics |
7 / 27 page 7/27 L6712A L6712 REFERENCE SCHEMATIC DEVICE DESCRIPTION The device is an integrated circuit realized in BCD technology. It provides complete control logic and pro- tections for a high performance dual-phase step-down converter optimized for high current DC/DC appli- cations. It is designed to drive N-Channel Mosfets in a two-phase synchronous-rectified buck topology. A 180 deg phase shift is provided between the two phases allowing reduction in the input capacitor current ripple, reducing also the size and the losses. The output voltage of the converter can be precisely regu- lated, programming the VID pins, from 0.900 to 3.300V with a maximum tolerance of ±0.9% over temper- ature and line voltage variations. The programmable Remote Sense Amplifier avoids the use of external resistor divider allowing recovering drops across distribution lines and also adjusting output voltage to dif- ferent values from the available reference. The device provides an average current-mode control with fast transient response. It includes a 150kHz free-running oscillator externally adjustable through a resistor. The error amplifier features a 15V/ µs slew rate that permits high converter bandwidth for fast transient per- formances. Current information is read across the lower mosfets RdsON or across a sense resistor placed in series to the LS mos in fully differential mode. The current information corrects the PWM outputs in order to equalize the average current carried by each phase. Current sharing between the two phases is then limited at ±10% over static and dynamic conditions unless considering the sensing element spread. Droop effect can be programmed in order to minimize output filter and load transient response: the function can be disabled and the current information available on the pin can be used for other purposes. The device protects against Over-Current, with an OC threshold for each phase, entering in constant current mode. Since the current is read across the low side mosfets, the device keeps constant the bottom of the induc- tors current triangular waveform. When an Under Voltage is detected the device resets with all mosfets OFF and suddenly re-starts. The device also performs a crowbar Over-Voltage protection that immediate- ly latches the operations turning ON the lower driver and driving high the FAULT pin. PGOOD PGND PGNDS2 ISEN2 LGATE2 VSEN PHASE2 UGATE2 BOOT2 VCC SGND OSC / INH VID0 VID1 VID2 REF_IN/OUT PGNDS1 ISEN1 LGATE1 PHASE1 UGATE1 BOOT1 VCCDR FBR FBG Rg Rg LS2 HS2 L2 C IN C OUT S1 S0 S2 Rg LS1 L1 HS1 Vin GNDin PGOOD L6712 L6712A LOAD Rg FB COMP DROOP R FB R F C F |
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