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BQ24153 Просмотр технического описания (PDF) - Texas Instruments

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BQ24153 Fully Integrated Switch-Mode One-Cell Li-Ion Charger With Full USB Compliance and USB-OTG Support TI
Texas Instruments TI
BQ24153 Datasheet PDF : 41 Pages
First Prev 31 32 33 34 35 36 37 38 39 40
bq24153
bq24156, bq24158
SLUSA27 – MARCH 2010
PART NUMBER
LQM2HPN1R0MJ0
MIPS2520D1R0
MDT2520-CN1R0M
CP1008
1 mH
1 mH
1 mH
1 mH
Table 12. Inductor Part Numbers
INDUCTANCE
SIZE
2.5 x 2.0 mm
2.5 x 2.0 mm
2.5 x 2.0 mm
2.5 x 2.0 mm
www.ti.com
MANUFACTURER
Murata
FDK
TOKO
Inter-Technical
2. Determine the output capacitor value )COUT) using 40 kHz as the resonant frequency:
1
fo =
2p ´ LOUT ´ COUT
(9)
1
COUT = 4p2 ´ f02 ´ LOUT
(10)
COUT
=
1
4p2 ´ (40 ´ 103 )2 ´ (1 ´ 10-6 )
(11)
COUT = 15.8 mF
Select two 0603 X5R 6.3V 10-mF ceramic capacitors in parallel i.e., Murata GRM188R60J106M.
3. Determine the sense resistor using the following equation:
R(SNS)
=
V(RSNS)
I(CHARGE)
(12)
The maximum sense voltage across sense resistor is 85 mV. In order to get a better current regulation
accuracy, V(RSNS) should equal 85mV, and calculate the value for the sense resistor.
R(SNS)
=
85mV
1.25A
(13)
R(SNS) = 68 m
This is a standard value. If it is not a standard value, then choose the next close value and calculate the real
charge current. Calculate the power dissipation on the sense resistor:
P(RSNS) = I(CHARGE) 2 × R(SNS)
P(RSNS) = 1.252 × 0.068
P(RSNS) = 0.106 W
Select 0402 0.125-W 68-m2% sense resistor, i.e. Panasonic ERJ2BWGR068.
4. Measured efficiency and total power loss with different inductors are shown in Figure 37. SW node and
inductor current waveform are shown in Figure 38.
34
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