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参数资料
型号： TPS40070PWPRG4
厂商： TEXAS INSTRUMENTS INC
元件分类： 稳压器
英文描述： 2 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16
封装： GREEN, PLASTIC, HTSSOP-16
文件页数： 6/28页
文件大小： 655K
代理商： TPS40070PWPRG4
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)
TPS40070
TPS40071
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
RVDD is the current through RVDD and can be calculated using Equation 10.
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
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Copyright 2003–2009, Texas Instruments Incorporated
Product Folder Link(s): TPS40070 TPS40071
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TPS40071PWPR 2 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16
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