ISL6522A Intersil Corporation, ISL6522A Datasheet
ISL6522A
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ISL6522A Summary of contents
Page 1
... Data Sheet Buck and Synchronous Rectifier Pulse-Width Modulator (PWM) Controller The ISL6522A 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 ISL6522A integrates all of the control, output adjustment, monitoring and protection functions into a single package ...
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... Typical Application SS RT REF FB Block Diagram OCSET REFERENCE FB COMP RT 2 ISL6522A 12V V CC OCSET MONITOR AND EN PROTECTION BOOT OSC UGATE PHASE ISL6522A +12V PV CC LGATE - + + PGND - GND COMP POWER-ON RESET (POR OVER CURRENT 4V 200µA PWM 0.8V COMPARATOR REF + + - - ERROR AMP OSCILLATOR ...
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... Supply Voltage Ambient Temperature Range, ISL6522AC Junction Temperature Range, ISL6522AC CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied ...
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... Connect a capacitor from this pin to ground. This capacitor, along with an internal 10µA current source, sets the soft-start interval of the converter. COMP and FB COMP and FB are the available external pins of the error amplifier. The FB pin is the inverting input of the error 4 ISL6522A ...
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... Provide a 12V bias supply for the chip to this pin. Functional Description Initialization The ISL6522A 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. ...
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... ISL6522A capacitors, damage may occur to these parts. If the bias voltage for the ISL6522A comes from the V maximum voltage rating of the ISL6522A may be exceeded and with a the IC will experience a catastrophic failure and the converter SS will no longer be operational. Ensuring that there is a path for the current to follow other than the capacitance on the rail will prevent these failure modes ...
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... The compensation network consists of the error amplifier (internal to the ISL6522A) 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 ...
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... Given a sufficiently fast control loop design, the ISL6522A 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 ...
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... These equations assume linear voltage-current transitions and do not adequately model power loss due the reverse-recovery of the upper and lower MOSFET’s body diode. The gate-charge losses are dissipated by the ISL6522A and do not heat the MOSFETs. However, large gate-charge increases the switching interval, t ...
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... Figure 11 shows a DC-DC converter circuit for a microprocessor application, originally designed to employ the HIP6006 controller. Given the similarities between the HIP6006 and ISL6522A controllers, the circuit can be implemented using the ISL6522A controller without any modifications. Detailed information on the circuit, including a complete bill of materials and circuit board description, can be found in Application Note AN9722. See Intersil’ ...
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... However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries. For information regarding Intersil Corporation and its products, see www.intersil.com 11 ISL6522A L16.5x5B 16 LEAD QUAD FLAT NO-LEAD PLASTIC PACKAGE (COMPLIANT TO JEDEC MO-220VHHB ISSUE C) ...