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| 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： | 28/42页 |
| 文件大小： | 0K |
| 代理商： | TPS51727RHARG4 |
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Minimize High Current Loops
UDG-08012
C
B
4b
C
IN
L
C
OUT
4a
DRVH
Q1
1
2
3b
3a
DRVH
Q1
C
D
LL
PGND
V
OUT
V
BAT
SLUS806B – APRIL 2008 – REVISED JANUARY 2009 ..................................................................................................................................................... www.ti.com
Figure 34 shows the primary current loops in each phase, numbered in order of importance. The most important
loop to minimize the area of is Loop 1, the path from the input capacitor through the high and low-side
MOSFETs, and back to the capacitor through ground.
Figure 34. Major Current Loops Requiring Minimization
Loop 2 is from the inductor through the output capacitor, ground and Q2. The layout of the low-side gate drive
(Loops 3a and 3b) is important. The guidelines for gate drive layout are:
Make the low side gate drive as short as possible (1 inch or less preferred).
Make the DRVL width to length ratio of 1:10, wider (1:5) if possible
If changing layers is necessary, use at least two vias
A sample breakout of the driver side of the device is shown in Figure 35.
Figure 35. Recommended Gate Drive Section Breakout
34
Copyright 2008–2009, Texas Instruments Incorporated
Product Folder Link(s): TPS51727
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