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參數(shù)資料
| 型號： | TPS650732TRSLRQ1 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | POWER SUPPLY SUPPORT CKT, PQCC48 |
| 封裝： | 6 X 6 MM, 0.4 MM PITCH, GREEN, PLASTIC, QFN-48 |
| 文件頁數(shù)： | 63/90頁 |
| 文件大?。?/td> | 1375K |
| 代理商： | TPS650732TRSLRQ1 |
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Vo + V
Vin
D =
Vo + V
Vsw
-
(on)
AVG
Io
Vsw = Rds
I
Iavg =
1
D
-
V i
D
1
Vo + V
- h
÷
è
2.8 V
D
1
0.8
89%
19.2 V + 0.5 V
-
÷
è
(on)
AVG
(on)
Io
25 mA
Vsw = Rds
I
= Rds
= 0.6
140 mV
1
D
1
0.89
W
-
L
(Vin
Vsw)
dt
(2.8V
0.14V)
792 ns
V
dt
di =
=
= 117 mA
L
18
H
-
-
m
Io
25 mA
Iavg =
=
= 227 mA
1
D
1
0.89
-
117 mA
Imax = 227 mA +
= 285 m A
2
117 mA
Imin = 227 m A
= 169 mA
2
-
SLVSAP7 – JANUARY 2011
www.ti.com
The duty cycle for a boost converter is:
(10)
With:
(11)
A different approach to calculate the duty cycle is based on the efficiency of the converter. The typical number
can be found in the graphs, or as a first approach, we can assume to get an efficiency of about 80% as a typical
value.
(12)
With the values given above
(13)
ton = T × D = 890 ns × 0.89 = 792 ns
toff = 890 ns – 792 ns = 98ns
(14)
When the NMOS switch is turned on, the input voltage is forcing a current into the inductor. The current slope
can be calculated with:
(15)
(16)
The minimum and maximum inductor current can be found by adding half of the inductor current ripple (di) to the
average value, which gives:
(17)
Given the values above, an inductor with a current rating greater than 290mA is needed. Plenty of margin should
be kept to the rating in the inductor vendors data sheets as the maximum current is typically specified at a
inductance drop of 20% or even 30%. A list of tested inductors is given in Table 6 with the test conditions as
mentioned below.
Test conditions:
Vin = 2.8V
Vf = 3.2V (per LED)
Vf = 0.5V (Schottky diode)
Iout = 25mA per string; no dimming
Table 6. Tested Inductors
LED CONFIGURATION
INDUCTOR TYPE
INDUCTOR VALUE
SUPPLIER
1 × 6LEDs
LPS3015
18 mH
Coilcraft
2 × 6LEDs
LPS4018
47 mH
Coilcraft
1 × 10LEDs
LPS4018
47 mH
Coilcraft
66
Copyright 2011, Texas Instruments Incorporated
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