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| 型号： | TPS51727RHATG4 |
| 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： | 22/42页 |
| 文件大小： | 0K |
| 代理商： | TPS51727RHATG4 |
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MAX
P P
SAT
PHASE
I
1.5
36 A
N
2
-
=
+
=
÷
è
(9)
I
UDG-07188
CSN
L
R
DCR
R
NTC
R
PAR
C
SENSE
R
SERIES
R
SEQU
CSP
SENSE
EQ
DCR
L
C
R
=
(10)
www.ti.com ..................................................................................................................................................... SLUS806B – APRIL 2008 – REVISED JANUARY 2009
To allow for inductor tolerances, 0.36
H is chosen. The inductor must not saturate during peak loading
conditions.
The factor of 1.5 allows for current sensing and current limiting tolerances. The chosen inductor should have the
following characteristics:.
1. Create an inductance vs. current curve that is as flat as possible. Inductor DCR sensing is based on the idea
L/DCR is approximately a constant through the current range of interest.
2. Either high saturation or “soft saturation”.
3. Low DCR for improved efficiency, but at least 0.7 m
Ω for proper signal levels.
4. DCR tolerance as low as possible for load-line accuracy.
For this application, a 0.36-H, 1.2-m
Ω inductor is chosen
Step Five
Design the thermal compensation network. In most designs, NTC thermistors are used to compensate thermal
variations in the resistance of the inductor winding. This winding is generally copper, and so has a resistance
coefficient of 3900 PPM/C. NTC thermistors, on the other hand, have very non-linear characteristics and need
two or three resistors to linearize them over the range of interest. The typical DCR circuit is shown in Figure 31.
Figure 31. Typical DCR Sensing Circuit
In this circuit, good performance is obtained when:
In Equation 10, all of the parameters are defined in Figure 26 except REQ, which is the series/parallel
combination of the other four discrete resistors. CSENSE should be a capacitor type which is stable over
temperature; use X7R or better dielectric (C0G preferred).
Copyright 2008–2009, Texas Instruments Incorporated
29
Product Folder Link(s): TPS51727
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