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1.4
Control and Key Parameters Settings
Jack
Description
JP1
Select external TS input or internal valid TS setting
1-2 : External TS input
2-3 : Internal valid TS setting
JP2
The pullup power source supplies the LEDs when JP2 ON. LED has no
power source when JP2 is OFF.
JP3
TERM_EN setting
2-3 : Connect TERM_EN to VREF to enable termination
1-2 : Connect TERM_EN to GND to disable termination
JP4
Charger enable/disable setting. MPPSET is pulled to GND and the charger
is disabled when JP4 OFF; charger is enabled when JP4 is ON.
1.5
Recommended Operating Conditions
Symbol
Supply voltage, V
IN
Battery voltage, V
OUT
Supply current
Charge current, I
chrg
Operating junction temperature range, T
The bq24650EVM board requires a regulated supply approximately 1 V minimum above the regulated
voltage of the battery pack to a maximum input voltage of 28 Vdc. The charge voltage is programmed via
a resistor divider from the battery to ground, with the midpoint tied to the VFB pin.
R13 and R15 can be changed to regulate output between approximately 2.1 V to 26 V.
V
= 2.1 V
OUT
It is set at 12.6 Vdc from the factory.
A solar panel has a unique point on the V-I or V-P curve, called the maximum power point (MPP), at
which the entire photovoltaic (PV) system operates with maximum efficiency and produces its maximum
output power. The constant voltage algorithm is the simplest maximum power point tracking (MPPT)
method. The bq24650 automatically reduces charge current, so the maximum power point is maintained
for maximum efficiency.
If the solar panel or other input source cannot provide the total power of the system and bq24650 charger,
the input voltage drops. Once the voltage sensed on the MPPSET pin drops below 1.2 V, the charger
maintains the input voltage by reducing the charge current.
V
= 1.2 V
MPPSET
It is set at 17.8 Vdc from the factory.
SLUU444A – August 2010 – Revised October 2010
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Table 2. Control and Key Parameters Settings
Table 3. Recommended Operating Conditions
Description
Input voltage
Voltage applied at VOUT terminal
of J2
Maximum input current
Battery charge current
J
æ
ö
R13
´ ç
1 +
÷
è
ø
R15
æ
ö
R17
´ ç
1 +
÷
è
ø
R19
bq24650EVM Synchronous, Switch-Mode, Battery Charge Controller for
Copyright © 2010, Texas Instruments Incorporated
Factory Setting
Jumper ON 1-2 (external TS)
Jumper ON (LED power available)
Jumper ON 2-3 (enable termination)
Jumper OFF (disable charger)
Min
Typ Max Unit Notes
5
20
28
V
2.1
12.6
26
V
0
8
A
0
2
8
A
For charge current above 2 A, replace R6
and L1 with high-current rating
components
0
125
°C
Introduction
(1)
(2)
3
Solar Power
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