Texas Instruments BQ24600EVM - Evaluation Module for BQ24600 Multi Cell Synchronous Switch-Mode Charger BQ24600EVM BQ24600EVM Datenbogen
Produktcode
BQ24600EVM
Test Summary
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2.4.2
CHARGER REGULATION VOLTAGE
1. Increase the voltage of PS#1 until V(J1(VIN)) = 24V ± 0.1V.
Measure
→
V(J3(BAT, GND)) = 0V ± 1V
2. Put JP4 on.
Measure
→
Peak V(J3(BAT)) = 21V ± 1V (bq24600)
Measure
→
Peak V(J3(BAT)) = 18V ± 1V (bq24620)
Measure
→
Peak V(J3(BAT)) = 19.8V ± 1V (bq24640)
Measure
→
V(TP(REGN)) = 6V ± 500mV
Observe
→
D5(CHGEN) on; D7(STAT) blink; D6 (PG) on. (bq24600/20)
Observe
→
D5(CHGEN) on; D7(STAT) on; D6 (PG) on. (bq24640)
2.4.3
CHARGE CURRENT
1. Take JP4 off (Disable the charging).
2. Connect the Load #2 in series with a current meter (multimeter) to J3 (BAT, GND). Make sure a
2. Connect the Load #2 in series with a current meter (multimeter) to J3 (BAT, GND). Make sure a
voltage meter is connected across J3 (BAT, GND). Turn on the Load #2. Use the constant voltage
mode. Set the output voltage to 12V (HPA421 -001) or 2V (HPA421,-002,-003).
mode. Set the output voltage to 12V (HPA421 -001) or 2V (HPA421,-002,-003).
3. Connect the output of the Load #1 in series with a current meter (multimeter) to J3 (SYS, GND). Make
sure a voltage meter is connected across J3 (SYS, GND). Turn on the power of the Load #1. Set the
load current to 1A ±50mA but disable the output. Make sure Ibat = 0A ± 10mA and Isys = 0A ± 10mA.
load current to 1A ±50mA but disable the output. Make sure Ibat = 0A ± 10mA and Isys = 0A ± 10mA.
4. Put JP4 on (Enable the charging).
Observe
→
D5 (CHG EN) on
5. Measure
→
Ibat = 300mA ± 200mA (bq24600)
Measure
→
Ibat = 125mA ± 60mA (bq24620)
Measure
→
Ibat = 3A ± 300mA (bq24640)
Observe
→
D7 (STAT) on.
6. Set the Load #2 output voltage to 16.5V.
Measure
→
Ibat = 3000mA ± 300mA
Observe
→
D7 (STAT) on.
7. Set the Load #2 output voltage to 22V (bq600/40) or 19V (bq620).
Measure
→
Ibat = 0mA ± 300mA
Observe
→
D5(CHGEN) on; D6 (PG) on. (bq24600/20)
Observe
→
D5(CHGEN) on; D7(STAT) blink, D6 (PG) on. (bq24640)
8. Set the Load #2 output voltage back to 16.5V.
Measure
→
Ibat = 3000mA ± 300mA
Observe
→
D5(CHGEN) on; D7(STAT) on, D6 (PG) on.
2.4.4
CHARGER CUT-OFF BY THERMISTOR
1. Slowly increase the output voltage of PS2 until Ibat = 0 ±10mA.
Measure
→
V(J3(TS)) = 2.44V ±300mV
Observe
→
D7 (STAT) blink.
2. Slowly decrease the output voltage of PS2 to 1.4V±0.1V.
Measure
→
V(J3(TS)) = 1.4V ±100mV
Measure
→
Ibat = 3000mA ± 300mA (bq24600/640)
Measure
→
Ibat = 375mA ± 150mA (bq24620)
Observe
→
D7(STAT) on.
3. Slowly decrease the output voltage of PS2
Continue to decrease the output voltage of PS2 slowly until Ibat = 0 ±10mA
Measure
Measure
→
V(J4(TS)) = 1.14V ±200mV
Observe
→
D7(STAT) blink.
4. Slowly increase the output voltage of PS2 to 1.8V ± 300mV.
Measure
→
Ibat = 3000V ± 200mV
Observe
→
D7(STAT) on.
6
bq24600/20/40 EVM (HPA421) Multi Cell Synchronous Switch-Mode Charger
SLUU410 – February 2010
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