參數(shù)資料
型號： TPS65800RTQTG4
廠商： TEXAS INSTRUMENTS INC
元件分類： 電源管理
英文描述： 8-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC56
封裝： 8 X 8 MM, GREEN, PLASTIC, QFN-56
文件頁數(shù)： 91/98頁
文件大?。?/td> 2077K
代理商： TPS65800RTQTG4
www.ti.com
INPUT CAPACITOR SELECTION, SM1, SM2 CONVERTERS
OUTPUT VOLTAGE SELECTION, SM1, SM2 CONVERTERS
R1 +
V
SMxOUT
V
FB
* 1 R2
(16)
DESIGN EXAMPLES
SM1, SM2 CONVERTER DESIGN EXAMPLE
Ltarget +
V
OUT
0.3
I
OUT_MAX
1 *
V
OUT
V
IN_MAX
fsw
+ 3.35 mH, 3.3 mH is a good target.
(17)
C +
1
L[2
p
fc]2
+ 10.5 mF 10 mF is a good target.
(18)
CHARGER DESIGN EXAMPLE
R
ISET +
K
SET
V
SET
I
PGM
+ 1 kW
(19)
R
DPPM +
V
DPPM_OUT
K
DPPM
I
DPPM
+ 3.74 kW
(20)
SLVS606C – SEPTEMBER 2005 – REVISED FEBRUARY 2007
Buck converters have a pulsating input current that can generate high input voltage spikes at VIN. A low ESR
input capacitor is required to filter the input voltage, minimizing the interference with other circuits connected to
the same power supply rail. Each dc-dc converter requires a 10-
F ceramic input capacitor on its input pin.
Typically the output voltage is programmed by the I2C. An external divider can be added to raise the output
voltage, if the available I2C values do not meet the application requirements. Care must be taken with this
special option, because this external divider (gain factor) would apply to any selected I2C output voltage value
for this converter.
Equation 16 calculates R1, Let R2 = 20 k
:
Where VFB is the I
2C selected voltage, is the desired output voltage and R1/R2 is the feedback divider.
Design Conditions and Parametrs for SM1 or SM2:
Vin_SM1/2: 4.6V typical (May be less if input source is limited).
Vout_SM1/2: 1.24 V
Iout_max: 0.6 A
fsw = 1500 kHz
fc = 25 kHz
Design Conditions and Parameters for Charger:
Vout: 4.6 V; (OUT pin is input to charger)
Fast-charge current, IPGM: 1 A
DPPM-OUT threshold: 4.3 V; (charging current reduces when OUT falls to this level)
Safety timer: 5 h
Battery short circuit delay, tDELAY: 47 s; (Delays BAT short circuit during hot plug of battery)
TS temperature range: disabled
KSET=400; VSET=2.5 V; KDPPM = 1.15; IDPPM = 100 A; KTMR=0.36 s/
Program Fast-Charge Current Level:
Program DPPM_OUT Voltage Level (Level at Which Charging Current Reduces)
91
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