Intersil ISL68200 Series, User Manual

Page: 2 / 22

UG067 Rev.2.00 Page 2 of 22
Aug 23, 2017
ISL68200DEMO1Z
Demonstration Board
Description
The ISL68200DEMO1Z provides all circuitry required to
demonstrate the key features of the ISL68200. A majority of the
features of the ISL68200, such as optimal transient response
with Intersil’s R4 Modulator, 8-bit programmable boot voltage
levels, selectable switching frequency in continuous conduction
mode, selectable PFM operation option for improved light-load
efficiency, power-good monitor for soft-start and fault detection,
over-temperature protection, output overcurrent and short-circuit
protection, and output overvoltage protection are available on
this demonstration board.
Figure 1 shows a simplified schematic diagram of the
ISL68200DEMO1Z board. Figure 6 shows the detailed 20A buck
solution schematics, while Figure 7 shows the I/O connectors,
auxiliary circuits and on-board transient circuits. Figures 8
through 30 show typical performance data and Figures 31
through 36 show the PCB board layout. The default programming
pins setting is given on the upper right corner of Figure 7 , and the
Bill of Materials (BOM) is included for reference beginning on
page 9 .
The ISL68200DEMO1Z board can run by itself without a serial
bus communication. The operational configuration is fully
programmable using programming pins (PROG1-4).
The ISL68200 however, uses the PMBus/SMBus/I
2
C protocol
and provides the flexibility for digital power management and
performance optimization before finalizing the hardware
configuration on the programming pins.
The buck regulator in the ISL68200DEMO1Z board is a single
input rail design, that is, everything is biased by the input supply
(typically 12V). The resistor divider on the EN pin (R
4
and R
12
)
can set the input supply undervoltage protection level and its
hysteresis. The “ENABLE” switch is a hardware operational
control, alternately, the serial bus ON_OFF_CONFIG and
OPERATION commands can be used for software operational
control.
Furthermore, an on-board transient load, as shown in Figure 7 ,
with both di/dt and load step amplitude is controlled by a
function generator. Because this auxiliary circuit draws more
than 10A of bias current, the jumper on JP5 should be removed
for accurate efficiency measurement.
Intersil’s PowerNavigator evaluation software is compatible with
Windows operating systems and can be used to evaluate the
serial bus functionality of the ISL68200. The software and user
guide can be found at:
http://www.intersil.com/powernavigator
Quick Start Guide
Stand-Alone Operation
1. Set the ENABLE switch to the “OFF” position.
2. Connect a power supply (off) to input connectors (J4-VIN and
J3-GND).
3. Set the input power supply voltage level (no more than 15V)
and current limiting (no more than 1A for 0A load).
4. Turn the power supply on.
5. Set the ENABLE switch to the “ON” position.
6. Increase the power supply current limit enough to support
more than the full load.
7. Apply load to the output connectors (J1-VOUT and J2-SGND).
8. Monitor operation using an oscilloscope.
PMBus Operation
1. Connect the supplied dongle to J8.
2. Connect the supplied USB cable from the computer to the
dongle.
3. After the input power supply turns on, open the
PowerNavigator™ evaluation software.
4. Select the detected ISL68200 device (Address - 60h) and
follow Intersil’s PowerNavigator operation guide.
5. Monitor and configure the board using PMBus commands in
the evaluation software.
FIGURE 2. DEMONSTRATION BOARD TOP VIEW
FIGURE 3. DEMONSTRATION BOARD BOTTOM VIEW