IRDC2085S-S

IRDC2085S-S Datasheet

IRDC2085S-S DEMO BOARD EVALUATION PROCEDURE

Part	Datasheet
IRDC2085S-S	IRDC2085S-S (pdf)

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IRDC2085S-S DEMO BOARD EVALUATION PROCEDURE International Rectifier • 233 Kansas Street, El Segundo, CA 90245 USA Overview This document describes how to connect and evaluate the supplied IRDC2085S-DF demo board. The demo board incorporates a new DC Bus Converter chipset in a fixed-frequency, open-loop isolated half-bridge DC-DC converter with 6:1 input to output voltage conversion ratio. The chipset consists of a primary side IC IR2085S , two 80V primary side FETs IRF7493 , two 30V secondary side FETs IRF7832 , a primary side biasing FET IRF7380 and a secondary side gate clamp FET IRF9956 . The front side of the demo board is shown in Fig. -Vin +Vin -Vout +Vout IRDC2085S-S 150W DC Bus Demo Board Fig. 1 Front side of the DC Bus Converter demo board with IR2085S ChipSet with marked input and output pins. This version of the Demo Board employs IRF7832 Power MOSFETs for secondary synchronous rectification IRDC2085S-S Quick Evaluation Procedure To evaluate the operation and performance of the IRDC2085S-S demo board, connect a power supply to its input terminals, and a power load to its output terminals. Input and output terminals are marked in Fig. To duplicate the performance data reported on page two, approximately 400 LFM of airflow is needed across the module. The circuit will start to operate as soon as the primary Vcc reaches about 9V typically at 12Vin. At this low input voltage, the output voltage will be only about 2V, and the secondary Vcc will be insufficient to fully enhance the secondary side synchronous rectifier MOSFETs. To avoid excessive body diode conduction losses, output current during slow input voltage ramp-up should be set at less than 2A. IRDC2085S-S Demo Board Description and circuit capability The circuit is designed to deliver continuous 20A output current in 36V 60V input voltage range, with 400 LFM of airflow. Output voltage for this input voltage range will vary from 6V to 10V, and the total available output power from the module will range from around 120W at 36V to up to 200W at 60V input. The circuit design is optimized in order to demonstrate true performance of the IR2085S control IC, IRF7493 primary FETs and IRF7832 secondary FETs. Therefore, no test pins are available on the board. To probe the circuit waveforms use an oscilloscope probe with minimal length for the ground pin and connect directly to the pins of the IC / MOSFET device. To measure circuit efficiency, voltage and current at the input and output of the demo board need to be accurately measured. Use of calibrated shunts for input and output current measurements is strongly recommended, as is use of a thermal camera for thermal performance evaluation. International Rectifier A complete schematic of the demo board is shown in Fig. Typical efficiency and a thermal image for 150W output power at 48Vin are shown in Fig. Inputs and outputs of two or more modules can be connected in parallel to provide required output power higher than 150W. Due to natural output voltage droop associated with open-loop operation, no additional circuitry is required for relatively accurate current sharing in the range of 36~60Vinput Rb2 200 Rb1 200 Rb9 39k NM6 IRF7380 Db3 Db5 3V Db1 15V Cb1 .1u Rb10 39k Db4 Db2 9V Cb2 .1u Rg2 100k IRF6603 or IRF7832 C7 C8 22u Romote shutdown Vdd C4 36~60Vinput IRF7493 3.3u IR2085S cs Vb ct HO LOVcc 3.3u IRF7493

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IRDC2085S-S DEMO BOARD EVALUATION PROCEDURE

International Rectifier
• 233 Kansas Street, El Segundo, CA 90245 USA

Overview

This document describes how to connect and evaluate the supplied IRDC2085S-DF demo board. The demo board incorporates a new DC Bus Converter chipset in a fixed-frequency, open-loop isolated half-bridge DC-DC converter with 6:1 input to output voltage conversion ratio. The chipset consists of a primary side IC IR2085S , two 80V primary side FETs IRF7493 , two 30V secondary side FETs IRF7832 , a primary side biasing FET IRF7380 and a secondary side gate clamp FET IRF9956 . The front side of the demo board is shown in Fig.
-Vin +Vin
-Vout +Vout
*IRDC2085S-S 150W DC Bus Demo Board

Fig. 1 Front side of the DC Bus Converter demo board with IR2085S ChipSet with marked input and output pins. This version of the Demo Board employs IRF7832 Power MOSFETs for secondary synchronous rectification *

IRDC2085S-S Quick Evaluation Procedure

To evaluate the operation and performance of the IRDC2085S-S demo board, connect a power supply to its input terminals, and a power load to its output terminals. Input and output terminals are marked in Fig. To duplicate the performance data reported on page two, approximately 400 LFM of airflow is needed across the module.

The circuit will start to operate as soon as the primary Vcc reaches about 9V typically at 12Vin. At this low input voltage, the output voltage will be only about 2V, and the secondary Vcc will be insufficient to fully enhance the secondary side synchronous rectifier MOSFETs. To avoid excessive body diode conduction losses, output current during slow input voltage ramp-up should be set at less than 2A.

IRDC2085S-S Demo Board Description and circuit capability

The circuit is designed to deliver continuous 20A output current in 36V 60V input voltage range, with 400 LFM of airflow. Output voltage for this input voltage range will vary from 6V to 10V, and the total available output power from the module will range from around 120W at 36V to up to 200W at 60V input.

The circuit design is optimized in order to demonstrate true performance of the IR2085S control IC, IRF7493 primary FETs and IRF7832 secondary FETs. Therefore, no test pins are available on the board. To probe the circuit waveforms use an oscilloscope probe with minimal length for the ground pin and connect directly to the pins of the IC / MOSFET device.

To measure circuit efficiency, voltage and current at the input and output of the demo board need to be accurately measured. Use of calibrated shunts for input and output current measurements is strongly recommended, as is use of a thermal camera for thermal performance evaluation.

International Rectifier

A complete schematic of the demo board is shown in Fig. Typical efficiency and a thermal image for 150W output power at 48Vin are shown in Fig. Inputs and outputs of two or more modules can be connected in parallel to provide required output power higher than 150W. Due to natural output voltage droop associated with open-loop operation, no additional circuitry is required for relatively accurate current sharing in the range of
36~60Vinput

Rb2 200 Rb1 200

Rb9 39k

NM6 IRF7380 Db3

Db5 3V

Db1 15V

Cb1 .1u

Rb10 39k Db4

Db2 9V

Cb2 .1u

Rg2 100k

IRF6603 or IRF7832

C7 C8 22u

Romote shutdown

Vdd C4
36~60Vinput

IRF7493
3.3u

IR2085S
cs Vb
ct HO

LOVcc
3.3u

IRF7493

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Datasheet ID: IRDC2085S-S 638326