HIP6012 Intersil Corporation, HIP6012 Datasheet
HIP6012
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HIP6012 Summary of contents
Page 1
... The HIP6012 provides complete control and protection for a DC-DC converter optimized for high-performance microprocessor applications designed to drive two N-Channel MOSFETs in a synchronous-rectified buck topology. The HIP6012 integrates all of the control, output adjustment, monitoring and protection functions into a single package. The output voltage of the converter can be precisely regulated to as low as 1 ...
Page 2
... Typical Application SS RT REF FB Block Diagram OCSET REFERENCE FB COMP RT 2-153 HIP6012 12V VCC OCSET MONITOR AND EN PROTECTION BOOT OSC UGATE PHASE HIP6012 PVCC +12V - LGATE + + PGND - COMP GND + - OVER- CURRENT 4V 200 A PWM 1.27 VREF COMPARATOR + + - - ERROR AMP OSCILLATOR +5V OR +12V +V O VCC ...
Page 3
... Upper Gate Source Upper Gate Sink Lower Gate Source Lower Gate Sink PROTECTION OCSET Current Source Soft Start Current 2-154 HIP6012 Thermal Information Thermal Resistance (Typical, Note 1) SOIC Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +0.3V Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . . 150 CC Maximum Storage Temperature Range . . . . . . . . . . -65 Maximum Lead Temperature (Soldering 10s 300 ...
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... OCS the converter over-current (OC) trip point according to the following equation OCS OCSET I = ------------------------------------------- - PEAK over-current trip cycles the soft-start function. 2-155 HIP6012 100 1000 FIGURE 2. BIAS SUPPLY CURRENT vs FREQUENCY SS (Pin 3) Connect a capacitor from this pin to ground. This capacitor, ...
Page 5
... Provide a 12V bias supply for the chip to this pin. Functional Description Initialization The HIP6012 automatically initializes upon receipt of power. Special sequencing of the input supplies is not necessary. The Power-On Reset (POR) function continually monitors the input supply voltages and the enable (EN) pin. The POR ...
Page 6
... Please note that the capacitors C and C each represent numerous physical capacitors. O Locate the HIP6012 within 3 inches of the MOSFETs, Q1 and Q2. The circuit traces for the MOSFETs’ gate and source connections from the HIP6012 must be sized to handle peak current. ...
Page 7
... The compensation network consists of the error amplifier (internal to the HIP6012) and the impedance networks Z and Z . The goal of the compensation network is to provide FB a closed loop transfer function with the highest 0dB crossing frequency (f ) and adequate phase margin. Phase margin ...
Page 8
... Given a sufficiently fast control loop design, the HIP6012 will provide either 0% or 100% duty cycle in response to a load transient. The response time is the time required to slew the inductor current from an initial current value to the transient current level ...
Page 9
... These equations assume linear voltage-current transitions and do not adequately model power loss due the reverse- recovery of the lower MOSFETs body diode. The gate-charge losses are dissipated by the HIP6012 and don't heat the MOSFETs. However, large gate-charge increases the switching interval, t which increases the upper SW MOSFET switching losses ...
Page 10
... The figure below shows a DC-DC converter circuit for a microprocessor application, originally designed to employ the HIP6006 controller. Given the similarities between the HIP6006 and HIP6012 controllers, the circuit can be implemented using the HIP6012 controller without any modifications. However, given the expanded reference ...