Renesas ISL81802EVAL3Z, User Manual

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ISL81802EVAL3Z 1. Functional Description
R16UH0004EU0100 Rev.1.00 Page 3 of 19
Sep.15.20
1. Functional Description
The ISL81802EVAL3Z is the same test board used by Renesas application engineers and IC designers to
evaluate the performance of the ISL81802 HTSSOP IC. The board provides an easy and complete evaluation of
all the IC and board functions.
As shown in Figure 2 , 18V to 80V VIN is supplied to J1/J13 (+) and J2/J14 (-). The regulated 12V output on
J4/J10 (+) and J5/J11 (-) can supply up to 40A to the load. Because of the high power efficiency, the evaluation
board can run at 40A continuously without airflow at room temperature ambient conditions.
Test points TP1 through TP36 provide easy access to the IC pin and external signal injection terminals.
As shown in Table 2 , connectors J6 and J8 provide a selection of either Forced PWM mode (shorting Pin 1 and
Pin 2) or DEM mode (shorting Pin 2 and Pin 3). Connectors J7 and J12 provide a selection of either constant
current limit (shorting Pin 1 and Pin 2) or HICCUP OCP (shorting Pin 2 and Pin 3). Connectors J3 and J9 provide
an option to disable the converter by shorting its Pin 1 and Pin 2.
1.1 Recommended Testing Equipment
The following materials are recommended for testing:
• 0V to 80V power supply with at least 40A source current capability
• Electronic loads capable of sinking current up to 50A
• Digital Multimeters (DMMs)
• 100MHz quad-trace oscilloscope
1.2 Operating Range
The input voltage range is from 18V to 80V for an output voltage of 12V. If the output voltage is set to a lower
value, the minimum V
IN
can be reset to a lower value by changing both the ratio of R
1
and R
5
, and the ratio of R
58
and R
63
. The minimum EN threshold that V
IN
can be set to is 4.5V.
The rated load current is 40A with the OCP point set at minimum 44A at ambient room temperature conditions.
The operating temperature range of this board is -40°C to +85°C.
Note: Airflow is needed for higher temperature ambient conditions.
1.3 Quick Test Guide
1. Jumper J6 provides the option to select PWM or DEM. Jumper J7 provides the option to select constant current
limit or HICCUP. See Table 2 for the operating options. Ensure that the circuit is correctly connected to the
supply and electronic loads before applying any power. See Figure 2 for proper setup.
Table 2. Operating Options
Jumper Position Function
3, 9 EN-GND Disable output
EN Floating Enable output
6, 8 Pin 1-2 PWM
Pin 2-3 DEM
7, 12 Pin 1-2 Constant current limit
Pin 2-3 HICCUP