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参数资料
| 型号： | TPS51727RHARG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PQCC40 |
| 封装： | 6 X 6 MM, GREEN, PLASTIC, QFN-40 |
| 文件页数： | 24/42页 |
| 文件大小： | 0K |
| 代理商： | TPS51727RHARG4 |
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(
)
P _ N
DCR
CS eff
SEQU
P _ N
R
÷
=
÷
+
è
(11)
(
)
CS
CS eff
DROOP
M
OUT
R
A
R
G
R
=
(12)
( )
OUT
DYN
M
DROOP
CS
MAX
R
I
G
L
C
30pF
50pF
R
A
D
V L
=
-
=
(13)
SLEW
K
V
R
SR
=
(14)
SLUS806B – APRIL 2008 – REVISED JANUARY 2009 ..................................................................................................................................................... www.ti.com
Since calculating these values by hand is difficult, TI has a spreadsheet using the Excel "Solver" function
available to calculate them. Please contact your local TI representative to get a copy of the spreadsheet.
In the reference design, the following values are input to the spreadsheet::
L
R
DCR
Load Line (R
OUT)
Thermistor R25 and "b" value
The spreadsheet then calculates RSEQU, RSERIES, RPAR, and CSENSE. In this case, the nearest standard values
are:
R
SEQU = 24.9 k
R
SERIES = 43.2 k
R
PAR = 165 k
C
SENSE =18 nF
Note the effective divider ratio for the inductor DCR. The effective current sense resistance, RCS(eff) is shown in
Step Six
Determine the output capacitor configuration. This depends on the transient specification of the load. If ROUT is
high enough, the transient specification can be met within the DC load-line. A successful design includes a
combination of bulk and ceramic capacitance totaling at least 1200
F.
Step Seven
Set the load line. The load line is set by the droop resistor knowing ROUT and RCS(eff).
RDROOP = 11.0 k
Step Eight
Calculate the droop capacitance. From Equation 13 .
The next smaller standard value, 47 pF, is chosen.
Step Nine
Calculate RSLEW. RSLEW sets the rate for all transitions including:
1. Start-up slew rate
2. Shutdown slew rate
3. VID change slew rate (+ or –)
Here, the OVP is enabled, so RSLEW is terminated to GND. KSLEW = 1.25 × 10
9 and V
SLEW = 1.25 V. For a slew
rate (SR) of 5.0 mV/
s, R
SLEW = 312.5 kΩ.
30
Copyright 2008–2009, Texas Instruments Incorporated
Product Folder Link(s): TPS51727
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