Texas Instruments SLUU477 - Manual (Page 3)

( )
DPM DPM_ 1
VDPM
DPM
VBUS_ VBUS_
R =
KVBUS_
-
ISE T
ISET
O UT
K
R =
I
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1.4 Control and Key Parameters Setting
Table 2. Control and Key Parameters Setting
Jack Description Factory Setting
JP1 Programs the fast-charge current setting. 500mA when JP1 ON; external setting Jumper OFF (external setting)
when JP1 OFF
JP2 Connect /EN and /PG together when JP2 ON to enable charger when power present Jumper OFF (external /EN)
JP3 Programs the input voltage regulation threshold. 4.5V when JP3 ON; external setting Jumper OFF (external setting)
when JP3 OFF.
JP4 Limited power charge mode (LPCM) when JP4 ON; normal operation when JP4 OFF Jumper OFF (normal operation)
JP5 Select external TS input or internal TS setting Jumper ON 1-2 (external TS)
1-2 : External TS input
2-3 : Internal TS setting
JP6 The pull-up power source supplies for the LEDs Jumper ON 2-3 (VBUS)
1-2 : BAT
2-3 : VBUS
JP7 Charger ON/OFF command Jumper ON 1-2 (charger OFF)
1-2 : OFF
2-3 : ON
1.5 Recommendd Operating Conditions
Table 3. Recommendd Operating Conditions
Description Min Typ Max Unit Notes
Supply voltage, V
BUS
Input voltage 4.5 7.3 V
Battery voltage, V
BAT
Voltage applied at VBAT terminal of J2 0 4.2 V
Supply current Maximum input current 0 0.8 A
Charge current, I
chrg
Battery charge current 0 0.8 A
Operating junction temperature 0 125 °C
range, T
J
An external resistor is used to program the VBUS_DPM. The programming resistor, R
VDPM
is dictated by
the following equation:
(1)
Where:
VBUS_
DPM
is the desired input voltage regulation voltage threshold;
VBUS_
DPM_1
is the built-in offset threshold, nominally 3.5V
K
VBUS_DPM
is a gain factor found in the electrical specification.
If VDPM pin is shorted to VSS, the VBUS_
DPM
should be clamped to 3.65V.
If the VDPM pin is floated (open circuit), the IC operates in Battery Tracking Mode. In this case, VBUS
DPM threshold is internally set as V
TRK
, which is BAT+100mV (BAT>3.65V) or 3.75V (BAT ≤ 3.4V).
Connecting JP3 set 4.5V VDPM on EVM.
An external resistor is used to program the output current (50-800mA). The equation for charge current is:
(2)
Where, I
OUT
is the desired fast charge current; K
ISET
is a gain factor found in the spec.
The termination and pre-charge current are internally set at 10% and 20% of fast charge current
respectively. The pre-charge-to-fast-charge, V
lowv
threshold is set to 2.5V.
Connecting JP1 set 500mADC for fast charge current and 100mADC for pre-charge current on EVM.
3 SLUU477 – December 2010 800mA, Single-Input, Single Cell Li-Ion Battery Solar Charger with Power Path
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