Modifications
3
Modifications
See the bq51025 data sheet (
) when changing components. To aid in such customization of the
EVM, the board was designed with devices having 0402 and 0603 or larger footprints. A real
implementation likely occupies less total board space.
Note that changing components can improve or degrade EVM performance. Special attention should be
given to the resonant capacitors (C1, C2, and C3). Thermal performance of these capacitors can greatly
impact overall system performance.
4
Recommended Operating Conditions
provides a summary of the bq51025EVM-649 performance specifications. All specifications are
given for an ambient temperature of 25°C.
Table 1. bq51025EVM-649 Recommended Operating Conditions
PARAMETER
TEST CONDITION
MIN
TYP
MAX
UNIT
V
RECT
RECT voltage range
4
11
V
I
OUT
Output current
Current limit programming range
2
A
I
AD_EN
Sink current
1
mA
P
OUT
= 10 W with the bq500215 transmitter
V
OUT(REG)
Programmable output voltage
(1)
4.5
7
10
V
EVM (PWR648), otherwise P
OUT
= 5 W
f
s
Switching frequency
110
205
kHz
T
J
Junction temperature
0
125
°C
(1)
The output voltage can be adjusted using I
2
C or the VIREG and VO_REG resistors. Also the coil needs to change for different
output voltage levels for optimal operation of the EVM. See the bq51025 datasheet for details.
4
bq51025 Evaluation Module (PWR649)
SLUUB55 – September 2014
Copyright © 2014, Texas Instruments Incorporated