BQ24740 EVM
ACPWR
J1
GND
SYS
J8
GND
BAT
J20
/EXTPWR
APPLICATION CIRCUIT
PH
BAT
SYS
ACPWR
J6
J11
J12
J15
J2
U1
J5
J7
J17 J18
J14
J10
J16
J4
J3
J21
J9
J19
J13
BQ24740 EVM
ACPWR
J1
GND
SYS
J8
GND
BAT
J20
/EXTPWR
APPLICATION CIRCUIT
PH
BAT
SYS
ACPWR
J6
J11
J12
J15
J2
U1
J5
J7
J17 J18
J14
J10
J16
J4
J3
J21
J9
J19
J13
J8
V
Iin
I
Power
supply #1
V
V
Power
supply #2
2.4
Procedure
2.4.1
AC Adapter Detection Threshold
2.4.2
Selection of Regulation Voltage
Test Summary
www.ti.com
Figure 1. Original Test Setup for HPA206 (bq24740EVM)
1. Make sure the Equipment Setup steps of the previous section are followed.
2. Enable the output of PS#2.
3. Turn on PS#1.
Measure
→
V(J8(VSYS)) = 0
±
500 mV
Measure
→
V(TP(VREF)) = 0
±
1 V
Measure
→
V(TP(REGN)) = 0 V
±
500 mV
4. Increase the output voltage of PS#1 until D7 (EXTPWR) is on, but do not exceed 20 V.
Measure
→
V(TP(ACDET)) = 2.4 V
±
200 mV
Measure
→
V(J1(POS)) = 17.9 V
±
1 V
Measure
→
V(J8(SYS)) = 17.9 V
±
1 V
Measure
→
V(TP(VREF)) = 3.3 V
±
200 mV
Measure
→
D2 (BYPASS) on. D3 (ACDRV) on.
Observe
→
D5 (CHGEN) off (for bq24740 only), D5 (CE) on (for bq24741 only).
1. Increase the voltage of PS#1 until V(J1(POS)) = 19 V
±
0.1 V.
Measure
→
V(J8(BAT, GND)) = 0 V
±
2 V
Uninstall J20 enable the charging (for bq24740 only)
Observe
→
D5 (CHGEN) on
Install J20 enable the charging (for bq24741 only)
Observe
→
D5 (CE) off
Measure
→
V(TP(REGN)) = 6 V
±
500 mV
Measure
→
V(J8(BAT)) = 12.6 V
±
200 mV
2. Install J13 (CELLS, VPULUP)
Measure
→
V(J8(BAT)) = 16.8 V
±
200 mV
3. Install J13(CELLS, GND)
Measure
→
V(J8(BAT)) = 12.6 V
±
200 mV
bq24740/1EVM (HPA206) For Multicell Synchronous Notebook Charger
6
SLUU284A – June 2007 – Revised October 2008
