ISL6545A Intersil Corporation, ISL6545A Datasheet
ISL6545A
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ISL6545A Summary of contents
Page 1
... A selectable fixed frequency oscillator (ISL6545 for 300kHz; ISL6545A for 600kHz) reduces design complexity, while balancing typical application cost and efficiency. The error amplifier features a 20MHz gain-bandwidth product and 9V/μs slew rate which enables high converter bandwidth for fast transient performance ...
Page 2
... NOTE: Intersil Pb-free plus anneal products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate termination finish, which are RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020. 2 ISL6545, ISL6545A TEMP. PART MARKING RANGE (°C) ...
Page 3
... Block Diagram SAMPLE AND HOLD 21.5μA TO LGATE/OCSET FB 5V int. 20μA COMP/SD Typical Application C DCPL Type II R OFFSET compensation shown 3 ISL6545, ISL6545A POR AND + SOFT-START - OC COMPARATOR 5V int. ERROR PWM AMP COMPARATOR 0. 0.4V DIS + - OSCILLATOR FIXED 300 (or 600)kHz 12V VCC ...
Page 4
... CC Ambient Temperature Range ISL6545C, ISL6545AC . . . . . . . . . . . . . . . . . . . . . . . 0°C to +70°C ISL6545I, ISL6545AI . . . . . . . . . . . . . . . . . . . . . . .-40°C to +85°C Junction Temperature Range .-40°C to +125°C 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 ...
Page 5
... This pin provides ground referenced bias voltage to the upper MOSFET driver. A bootstrap circuit is used to create a voltage suitable to drive an N-channel MOSFET (equal to V the on-chip BOOT diode voltage drop), with respect to PHASE. 5 ISL6545, ISL6545A = 12V 85°C, Unless Otherwise Noted. (Continued ...
Page 6
... V is above V CC Overcurrent Protection on page 7 for more details on the equations and variables. Upon the completion of sample and 6 ISL6545, ISL6545A hold at T3, the soft-start operation is initiated, and the output voltage ramps up between T4 and T5. 0.4V GND> GND> GND> ...
Page 7
... If the shorted condition is not removed, this cycle will continue indefinitely. 7 ISL6545, ISL6545A Following POR (and 6.8ms delay), the ISL6545 initiates the Overcurrent Protection sample and hold operation. The LGATE driver is disabled to allow an internal 21.5μA current ...
Page 8
... The height of the current spike is not controlled affected by the step size of the output, the value of the output capacitors, as well as the IC error amp compensation possible to trip the overcurrent with inrush current, in addition to the normal load and ripple considerations. 8 ISL6545, ISL6545A resistor OCSET GND> ( ΔI ...
Page 9
... CC The switching frequency is either a fixed 300 or 600kHz, depending on the part number chosen (ISL6545 is 300kHz; ISL6545A is 600kHz; the generic name “ISL6545” may apply to either in the rest of this document, except when choosing the frequency). However, all of the other timing mentioned (POR delay, OCP sample, soft-start, etc.) is independent of the clock frequency (unless otherwise noted) ...
Page 10
... Figure 7 shows the critical power components of the converter. To minimize the voltage overshoot, the interconnecting wires indicated by heavy lines should be part of a ground or power 10 ISL6545, ISL6545A plane in a printed circuit board. The components shown should be located as close together as possible. Please note that the capacitors C capacitors ...
Page 11
... Select a value for R1 (1kΩ to 5kΩ, typically). Calculate value for R2 for desired converter bandwidth (F setting the output voltage via an offset resistor connected to the FB pin Figure 9, the design procedure can be followed as presented. 11 ISL6545, ISL6545A Calculate C1 such that F at 0 desired number) ...
Page 12
... An output capacitor is required to filter the output and supply the load transient current. The filtering requirements are a 12 ISL6545, ISL6545A function of the switching frequency and the ripple current. The load transient requirements are a function of the slew rate (di/dt) and the magnitude of the transient load current. ...
Page 13
... MOSFETs. These losses are distributed between the two MOSFETs according to duty factor. The switching 13 ISL6545, ISL6545A losses seen when sourcing current will be different from the switching losses seen when sinking current. When sourcing current, the upper MOSFET realizes most of the switching losses ...
Page 14
... FET will lower its r G-S DS(ON) gain in efficiency should be balanced against the extra cost and area of the external diode. For information on the Application circuit, including a complete Bill-of-Materials and circuit board description, can be found in Application Note AN1257. 14 ISL6545, ISL6545A ≈ G ≈ ...
Page 15
... INDEX AREA (DATUM N (Nd-1)Xe REF. BOTTOM VIEW C L (A1 SECTION "C-C" FOR ODD TERMINAL/SIDE 15 ISL6545, ISL6545A L10.3x3C 10 LEAD DUAL FLAT NO-LEAD PLASTIC PACKAGE 0. 0. SYMBOL 0. 0. NOTES: 1. Dimensioning and tolerancing conform to ASME Y14.5-1994. ...
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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 16 ISL6545, ISL6545A M8.15 (JEDEC MS-012-AA ISSUE C) 8 LEAD NARROW BODY SMALL OUTLINE PLASTIC PACKAGE ...