Texas Instruments BQ24640EVM - Evaluation Module for BQ24640 Multi Cell Synchronous Switch-Mode Charger BQ24640EVM BQ24640EVM Datenbogen
Produktcode
BQ24640EVM
BQ24600\20\ 40 EVM
HPA421A
ACPWR
J1
PGND
VSYS
J3
PGND
VBAT
PG
GND
APPLICATION CIRCUIT
PH
TP14/VSYS
TP10
VBAT
VBAT
ACPWR
TP11
TP11
CHGE
VREF
N
J2
J4
U1
J5
V
Iin
I
Power
supply
supply
Ibat
V
Isys
V
I
Load
#1
Load
#2
I
GND
VEXT
ISET1
VEXT
GND
VREF
LEDPWR
VPULLUP
Power
supply
supply
TS
/STAT1
/PG
JP5
JP3
BATDRV_EXT
JP1
ACDRV_EXT
JP2
CHGEN
JP4
ACDRV_IN
BATDRV_IN
Test Point
CHGEN
www.ti.com
Test Summary
2.3
Equipment Setup
(A) Set the power supply #1 for 0V ± 100mVDC, 5 ± 0.1A current limit and then turn off supply.
(B) Connect the output of power supply #1 in series with a current meter (multimeter) to J1 (VIN, GND).
(C) Connect a voltage meter across J1 (VIN, GND).
(D) Set the power supply #2 for 0V ± 100mVDC, 1 ± 0.1A current limit and then turn off supply.
(E) Connect the output of the power supply #2 to J3 (TS, GND).
(F) Connect Load #1 in series with a current meter to J3 (SYS, GND). Turn off Load #1.
(G) Connect Load #2 in series with a current meter to J3 (BAT, GND).Turn off Load #2.
(H) Connect a voltage meter across J3 (BAT, GND).
(I) Connect an oscilloscope’s probe across J3 (BAT, GND).
(J) Connect a voltage meter across J3 (SYS, GND).
(K) JP1: Connect to BATDRV_IN, JP2: Connect to ACDRV_IN, JP3 (VPULLUP and VREF): ON, JP4:
(B) Connect the output of power supply #1 in series with a current meter (multimeter) to J1 (VIN, GND).
(C) Connect a voltage meter across J1 (VIN, GND).
(D) Set the power supply #2 for 0V ± 100mVDC, 1 ± 0.1A current limit and then turn off supply.
(E) Connect the output of the power supply #2 to J3 (TS, GND).
(F) Connect Load #1 in series with a current meter to J3 (SYS, GND). Turn off Load #1.
(G) Connect Load #2 in series with a current meter to J3 (BAT, GND).Turn off Load #2.
(H) Connect a voltage meter across J3 (BAT, GND).
(I) Connect an oscilloscope’s probe across J3 (BAT, GND).
(J) Connect a voltage meter across J3 (SYS, GND).
(K) JP1: Connect to BATDRV_IN, JP2: Connect to ACDRV_IN, JP3 (VPULLUP and VREF): ON, JP4:
OFF, JP5: ON.
After the steps above, the test setup for HPA421 is shown in
Figure 1. Original Test Setup for HPA421 (bq24600/20/40 EVM)
2.4
Procedure
2.4.1
AC ADAPTER DETECTION THRESHOLD
1. Make sure EQUIPMENT SETUP steps are followed. Turn on PS#2.
2. Turn on PS#1
2. Turn on PS#1
Measure
→
V(J3(SYS)) = 0 ± 500mV
Measure
→
V(TP(VREF)) = 0V ± 1000mV
Measure
→
V(TP(REGN)) = 0V ± 500mV
3. Increase the output voltage on PS#1 until D6 (PG) on but do not exceed 5V. Set the power supply #2
to 1.8V ± 100mVDC
Measure
Measure
→
V(J1(VIN)) = 4.2V ± 0.5V
Measure
→
V(J3(SYS)) = 4.2V ± 0.5V
Measure
→
V(TP(VREF)) = 3.3V ± 200mV
Measure
→
V(TP(REGN)) = 0V ± 500mV
Observe
→
D7 (STAT) blink; D6 (PG) on
5
SLUU410 – February 2010
bq24600/20/40 EVM (HPA421) Multi Cell Synchronous Switch-Mode Charger
Copyright © 2010, Texas Instruments Incorporated