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參數(shù)資料
| 型號： | TPS65573DSSR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.5 A SWITCHED CAPACITOR CONVERTER, PDSO12 |
| 封裝： | 2 X 3 MM, SON-12 |
| 文件頁數(shù)： | 15/16頁 |
| 文件大?。?/td> | 681K |
| 代理商： | TPS65573DSSR |
()
PEAK
ON n
p
I
T
L
Trr n
VBAT
=
+
(1)
()
PEAK
OFF n
OUTn
I
T
N
L
V
=
(2)
Programming Peak Current
SLVS868 – MARCH 2009................................................................................................................................................................................................... www.ti.com
In Figure 5, ON time is almost the same period in every switch cycle. But the current at SW always starts from
negative value because of the Trr of the diode. Because of this, ON time depends on Trr. ON time is calculated
by Equation 1.
Where:
TON(n) =
ON time at n cycle switching
Lp =
Inductance of primary side
IPEAK =
Peak current at primary side
VBAT =
Battery voltage
Trr(n) =
Reverse recovery time at n cycle switching
OFF time is dependant on output voltage. As the output voltage gets higher, OFF time gets shorter (see
Where:
TOFF(n) =
OFF time at n cycle switching
N =
Turn ration of transformer
VOUT(n) =
Output voltage at n cycle switching
The TPS65573 provides a method to program the peak primary current with a voltage applied to the I_PEAK pin.
Figure 6 shows the relationship between I_PEAK pin voltage and a peak current at the primary side. This
function has the analog slope controlled by I_PEAK. The maximum voltage to control peak current at the primary
side is around 1.2 V.
Figure 6. I_PEAK Pin Voltage vs Peak Current at Primary Side
8
Copyright 2009, Texas Instruments Incorporated
Product Folder Link(s): TPS65573
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