Datasheet

www.ti.com Operation Guide
7.3 Jumper Settings
Jumpers Description
JP1 VPWI selection, default VPWI = 2.5 V
JP2 AVIN selection, default AVIN = PVIN
Default Closed: switching frequency is controlled by R20 (300 kHz default)
J2
When Open: switching frequency is synchronized to clock source connected to SYNC terminal
Default OPEN
J3
Should only be connected when AVIN ≤ 5 V. When AVIN ≤ 5 V, connecting J3 can improve efficiency.
Caution: if AVIN > 5.5 V, connecting J3 could damage the LM10500 device.
Default OPEN
Should only be connected when no voltage supply is connected to PVIN and AVIN. Intended for easy
J7
demonstration of the board by powering PVIN and AVIN by VBAT = 3.6 V.
Caution: if PVIN is higher than 5.5 V, connecting J7 could damage the USB2PWI board. VBAT can not
support large load current.
PWI version and address selection. Note that the LM10500 supports PWI1, PWI2-0, PWI2-1, PWI2-2, and
P1
PWI2-3. The USB2PWI board supports PWI1 and PWI2-0.
8 Operation Guide
8.1 Standalone Operation
LM10500 evaluation board can operate standalone without PWI interface connected. It is a full-featured
high performance 5 A synchronous buck regulator optimized for solution size, flexibility, and high
conversion efficiency. It also features monolithic integration of the high-side and low-side power
MOSFETs, resistor programmable switching frequency, frequency synchronization, internal soft start,
precision enable, power good (PWROK) indicator, input under voltage lock-out, over voltage protection,
over current protection and thermal shutdown.
8.2 PWI Communication Using USB2PWI Board
The unique feature of the LM10500 is close-loop Adaptive Voltage Scaling (AVS) capability. The LM10500
operates cooperatively with PowerWise® AVS compatible ASICs, SoCs, and processors to optimize
supply voltages adaptively over process and temperature variations. To simplify the evaluation of the AVS
functions in the LM10500, the evaluation board is designed to operate with the USB2PWI interface board
(included in the evaluation kit). With the USB2PWI board, PWI registers and LM10500 operating states
can be controlled by a PC via a simple register-based Graphical User Interface (GUI). Connect the
LM10500 evaluation board on top of the USB2PWI board by J4, J5 and J6, as shown in Figure 4, then
connect the USB2PWI board to a PC with a 5-pin mini USB cable (included in the evaluation kit).
Figure 4. Connecting the LM10500 Evaluation Board to the USB2PWI Interface Board
The USB2PWI board is powered by the USB port. It generates a 3.6 V voltage: V
BAT
. V
BAT
is used on the
evaluation board to provide the on board 2.5 V, which can be used to power VPWI. V
BAT
can also be
connected to PVIN to power the LM10500 when no other power supply is available. But the loading
capability is limited on V
BAT
. If available, PVIN should be powered by a bench supply with sufficient voltage
and current ranges.
5
SNVA453A–August 2011–Revised April 2013 AN-2080 LM10500 Evaluation Board
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