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參數資料
| 型號： | TPS40070PWPRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | 2 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | GREEN, PLASTIC, HTSSOP-16 |
| 文件頁數： | 6/28頁 |
| 文件大小： | 655K |
| 代理商： | TPS40070PWPRG4 |
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I
SCP(min) u
C
OUT
V
OUT
t
START
) ILOAD )
I
RIPPLE
2
(8)
R
ILIM +
100
R
DS(ON)max
I
SCP ) VILIM(ofst) ) 9
R
VDD
I
R
VDD
) 4.5 V
109
I
ILIM
(W)
(9)
I
R
VDD
+ fSW
Q
g(TOT) ) IDD (A)
(10)
I
SCP(max) +
1.09
I
ILIM(max)
R
ILIM * 0.09
R
VDD
I
R
VDD
* 0.045 V ) 75 mV
R
DS(ON)min
(A)
(11)
I
SCP(min) +
1.09
I
ILIM(min)
R
ILIM * 0.09
R
VDD
I
R
VDD
* 0.045 V ) 30 mV
R
DS(ON)max
(A)
(12)
C
ILIM(max) +
V
OUT
0.2
V
IN
R
ILIM
f
SW
(Farads)
(13)
SLUS582J – DECEMBER 2003 – REVISED APRIL 2009 .................................................................................................................................................. www.ti.com
The minimum short circuit limit setpoint (ISCP(min)) depends on tSTART, COUT, VOUT, ripple current in inductor
(IRIPPLE) and the load current at turn-on (ILOAD).
The short circuit limit programming resistor (RILIM) is calculated from:
where
I
ILIM is the current into the ILIM pin (110 A typical)
V
ILIM(ofst) is the offset voltage between SW and ILIM pins (-50 mV typical)
I
SCP is the short-circuit protection current
R
DS(ON)max is the drain-to-source resistance of the high-side MOSFET
R
VDD is the slew rate limit resistor if used
I
where
f
SW is the switching frequency
Q
g(TOT) is the combined total gate charge for both upper and lower MOSFETs (from MOSFET data sheet)
I
DD is the TPS4007x input current (3.5 mA maximum)
To find the range of the overcurrent values use the following equations.
The TPS40070/1 provides short circuit protection only. As such, it is recommended that the minimum short circuit
protection level be placed at least 20% above the maximum output current required from the converter. The
maximum output of the converter should be the steady state maximum output plus any transient specification
that may exist.
The ILIM capacitor maximum value can be found from:
Note that this is a recommended maximum value. If a smaller value can be used, it should be. For most
applications, consider using half the maximum value above.
14
Copyright 2003–2009, Texas Instruments Incorporated
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