Texas Instruments bq24072, Руководство пользователя

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OUT
J2
IN
GND
R8-ILIM
TMR
J1
5.25 VDC
J4
J3
EN1
JMP5
JMP4
EN2
CE
JMP3
VSS
VSS BA
T+
VSS TS
R16-TS
JMP2
JMP1
R10-ITERM R11-ISET
VSS = GND
TD
bq24072/3/4/5 EVM
HPA282 - UUT
or
R1
10
W
DMM
#2
DMM
#1
DMM
#3
R2
0.1
W
4.2 V Li-Ion Cell
P/S
#1
CH 1
CH 2
CH 4
CH 3
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Test Summary
5 SLVU274E – November 2008 – Revised January 2017
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Copyright © 2008–2017, Texas Instruments Incorporated
bq24072/3/4/5/9(T) and bq24230/2 1.5-A Single-Chip Li-Ion and Li-Polymer
Charge Management IC EVM
Figure 1. Test Diagram
4.3 Test Procedure
1. Verify that the equipment and EVM is set up according to the preceding section.
2. Verify that V
OUT
is approximately equal to V
BAT
3. Turn on P/S#1, +5.25-Vdc supply to the UUT.
4. Verify V
BAT
is between 2.4 Vdc and 3 Vdc, and the charger is in precharge state: LEDs CHG (D1) and
PGOOD (D2) are on. If V
BAT
is above the low-voltage threshold (V
(LOWV)
~3 V), then the IC is in fast-
charge mode. If the IC is in fast charge, skip step 7.
5. Verify DMM#3, I
BAT
is ~9 mV or ~0.09 A
6. Verify that V
OUT
for bq24072 is ~200 mV above the battery voltage or a minimum of 3.4 Vdc. For
bq24073/4 verify that V
OUT
is ~4.4 Vdc. Verify that bq24075/9(T) is ~5.5 Vdc for V
IN
> 5.6 V and equal
to V
IN
for Vin < 5.6 V.
7. Allow the battery to charge until V
BAT
is between 3.3 Vdc and 4 Vdc. The charger delivers the
programmed constant current to the battery unless the input cannot source the required current.
8. Verify I
BAT
is ~88 mV or ~0.9 A (for a 1-k
Ω
resistor on ISET ).
9. Verify V
OUT
: bq24072 – ~200 mV above the battery voltage.
10. Set JMP5 (EN1) to HI, and verify that the chip has been disabled, D1 (CHG) has turned off, and the
P/S#1 current has dropped to zero. The internal battery FET must be on, connecting the BAT pin to
the OUT pin. Verify that the voltage on the OUT pin is close to the battery voltage. See
Figure 2 for
EN1/2 modes of operation.
11. SET JMP4 (EN2) to VSS. Verify that the input current is less than 500 mA (USB 500-mA mode). If the
input current is restricted due to USB mode, or if the adapter is current limiting, the OUT pin drops in
voltage and enters the DPM mode, if the system current is less than the restricted input current. This
IC must be in DPM mode with the system voltage at the DPM
12. Set JMP5 (EN1) to VSS and verify USB 100-mA mode. The system load is more than the allowed 100
mA on the input, so the OUT voltage drops to the battery voltage, and the battery FET is switched on