ISL6700EVAL1

ISL6700EVAL1 Datasheet

ISL6700EVAL1 General Purpose Design Tool

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ISL6700EVAL1	ISL6700EVAL1 (pdf)

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ISL6700EVAL1 General Purpose Design Tool Application Note September 26, 2005 AN1006.1 The ISL6700 General Purpose Design Tool is a very simple evaluation board which can help the user rapidly construct an isolated DC/DC converter in several configurations. The board consists of the Intersil ISL6700 Half-Bridge Driver IC, two Intersil IRFR120 MOSFETs, a bootstrap diode, a bootstrap capacitor and two input voltage decoupling capacitors. The ISL6700 can operate at frequencies in excess of 500kHz and has typical propagation delay times of 30ns. It has 1.25A output drive capability and can switch an IRFR120 load with rise and fall times of less than 20ns. C2 HI VDD HB U1 6 HS ISL6700 FIGURE ISL6700EVAL1 SCHEMATIC Q2-S Q1-D Application Information The ISL6700 General Purpose Design Tool ISL6700EVAL1 is intended for users who have some experience in power converter design. The 80V rating of the ISL6700 makes it an ideal choice for many isolated DC/DC converters which are point-of-load converters in a distributed power architecture. To insure adequate design margin, the maximum voltage that should be applied to this input should be less than 80VDC. Three possible application converters are described briefly below. Application #1 Two-Switch Forward Converter VDD VIN Q2-S ISL6700EVAL1 BOARD Q1-D SECONDARY CIRCUIT ISOLATION FIGURE TWO SWITCH FORWARD CONVERTER Application #2 Half-Bridge Converter To use the ISL6700EVAL1 as part of a half-bridge converter, the user needs the configuration depicted in Figure In this topology, the MOSFETs are driven alternately, with some dead time between turn-off of one and turn-on of the other. Therefore, HI and LI are driven with alternating signals PWMA and PWMB from the PWM controller.. VDD VIN Q2-S ISL6700EVAL1 BOARD Q1-D PWMA PWM PWMB SECONDARY CIRCUIT ISOLATION FIGURE HALF-BRIDGE CONVERTER Application #3 Active-Clamp Forward Converter To use the ISL6700EVAL1 as part of an active-clamp forward converter, the user needs the configuration depicted in Figure In this topology, the MOSFETs are again driven alternately, and HI and LI need to be driven alternately as well. The high-side MOSFET Q2 in the ISL6700EVAL1 board , along with capacitor CRESET, is used in this topology as a means to reset the power transformer in a lossless manner. This topology lends itself well to running at duty cycles exceeding 50%, unlike Applications 1 and CAUTION These devices are sensitive to electrostatic discharge follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 \| Intersil and design is a registered trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2002, All Rights Reserved Application Note 1006 VDD VIN Q2-S

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ISL6700EVAL1 General Purpose Design Tool

Application Note

September 26, 2005

AN1006.1

The ISL6700 General Purpose Design Tool is a very simple evaluation board which can help the user rapidly construct an isolated DC/DC converter in several configurations. The board consists of the Intersil ISL6700 Half-Bridge Driver IC, two Intersil IRFR120 MOSFETs, a bootstrap diode, a bootstrap capacitor and two input voltage decoupling capacitors. The ISL6700 can operate at frequencies in excess of 500kHz and has typical propagation delay times of 30ns. It has 1.25A output drive capability and can switch an IRFR120 load with rise and fall times of less than 20ns.

C2 HI

VDD HB

U1 6 HS ISL6700

FIGURE ISL6700EVAL1 SCHEMATIC

Q2-S Q1-D

Application Information

The ISL6700 General Purpose Design Tool ISL6700EVAL1 is intended for users who have some experience in power converter design. The 80V rating of the ISL6700 makes it an ideal choice for many isolated DC/DC converters which are point-of-load converters in a distributed power architecture. To insure adequate design margin, the maximum voltage that should be applied to this input should be less than 80VDC. Three possible application converters are described briefly below.

Application #1 Two-Switch Forward Converter

VDD VIN

Q2-S

ISL6700EVAL1

BOARD

Q1-D

SECONDARY CIRCUIT

ISOLATION

FIGURE TWO SWITCH FORWARD CONVERTER

Application #2 Half-Bridge Converter

To use the ISL6700EVAL1 as part of a half-bridge converter, the user needs the configuration depicted in Figure In this topology, the MOSFETs are driven alternately, with some dead time between turn-off of one and turn-on of the other. Therefore, HI and LI are driven with alternating signals PWMA and PWMB from the PWM controller..

VDD VIN

Q2-S

ISL6700EVAL1

BOARD

Q1-D

PWMA

PWM PWMB

SECONDARY CIRCUIT

ISOLATION

FIGURE HALF-BRIDGE CONVERTER

Application #3 Active-Clamp Forward Converter

To use the ISL6700EVAL1 as part of an active-clamp forward converter, the user needs the configuration depicted in Figure In this topology, the MOSFETs are again driven alternately, and HI and LI need to be driven alternately as well. The high-side MOSFET Q2 in the ISL6700EVAL1 board , along with capacitor CRESET, is used in this topology as a means to reset the power transformer in a lossless manner. This topology lends itself well to running at duty cycles exceeding 50%, unlike Applications 1 and

CAUTION These devices are sensitive to electrostatic discharge follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil and design is a registered trademark of Intersil Americas Inc.

Copyright Intersil Americas Inc. 2002, All Rights Reserved

Application Note 1006

VDD VIN

Q2-S

Notice: we do not provide any warranties that information, datasheets, application notes, circuit diagrams, or software stored on this website are up-to-date or error free. The archived ISL6700EVAL1 Datasheet file may be downloaded here without warranties.

Datasheet ID: ISL6700EVAL1 639198