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SP6136 bảng dữ liệu(PDF) 8 Page - Sipex Corporation

tên linh kiện SP6136
Giải thích chi tiết về linh kiện  Synchronous Buck Controller
PDF  18 Pages
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nhà sản xuất  SIPEX [Sipex Corporation]
Trang chủ  http://www.sipex.com
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SP6136 bảng dữ liệu(HTML) 8 Page - Sipex Corporation

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8
Oct 3-06 Rev L
SP636 Synchronous Buck Controller
© 2006 Sipex Corporation
APPLICATION INFORMATION
Increasing the Current Limit
If it is desired to set Imax > {60mV / DCR} (in
this case larger than 4.6A), then a resistor
RS3
should be added as shown in figure 2.
RS3 forms a resistor divider and reduces the
voltage seen by the comparator.
Since: 60mV
(Imax • DCR)
RS3
=
{RS + RS2 + RS3}
Solving for RS3 we get:
RS3 =
[60mV • (RS + RS2)]
.......()
[(Imax • DCR) – 60mV]
As an example: if desired Imax is 7A, then
RS3
= 63.4KW.
Figure 2- Over-current detection circuit
for Imax > 60mV / DCR
Decreasing the Current Limit
If it is required to set Imax < {60mV / DCR}, a
resistor is added as shown in figure 3. RS3
increases the net voltage detected by the
current-sense comparator. Voltage at the
positive and negative terminal of compara-
tor is given by:
VSP = Vout + (Imax • DCR)
VSN = Vout •
{R
S3 / (RS2 + RS3)}
Since the comparator is triggered at 60mV:
VSP-VSN = 60 mV
Combining the above equations and solv-
ing for RS3:
RS3 =
RS2 • [Vout - 60mV + (IMAX•DCR)].........(2)
60mV - (IMAX • DCR)
As an example: for Imax of 2Aand Vout of 3.3V,
calculated RS3 is .5MW
(232KW standard).
Figure 3- Over-current detection circuit
for Imax < {60mV / DCR}
Power MOSFET Selection
There are four main criterion in selecting
Power MOSFETs for buck conversion:
●
Voltage rating BVdss
●
On resistance Rds(on)
●
Gate-to-drain charge Qgd
●
Package type
In order to better illustrate the MOSFET se-
lection process, the following buck converter
design example will be used: Vin = 2V, Vout
= 3.3V, Iout
= 10A, f = 2000KHz, DCR =
4.5m
W
(inductor DC resistance), efficiency
= 94% and Ta
= 40˚C.
Select the voltage rating based on maximum
input voltage of the converter. A commonly
used practice is to specify BVdss at least
twice the maximum converter input voltage.
This is done to safeguard against switching
transients that may break down the MOSFET.
For converters with Vin of less than 0V, a
RS3
63.4
K
CSP
6.8nF
SWN
ISP
ISN
SP613X
CS
0.uF
RS2
5.
K
RS
5.
K
L = 2.7uH, DCR = 4.mOhm
Vout
CSP
6.8nF
ISN
SP613X
SWN
ISP
CS
0.uF
RS2
5.
K
RS
5.
11K
Vout
L = 2.7uH, DCR = 4.mOhm
RS3
.5MOhm



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