參數(shù)資料
型號(hào)： TC105
廠商： Microchip Technology Inc.
英文描述： PFM/PWM Step-Down DC/DC Controller
中文描述： 烤瓷/ PWM降壓DC / DC控制器
文件頁(yè)數(shù)： 6/14頁(yè)
文件大?。?/td> 433K
代理商： TC105
TC105
DS21349B-page 6
2002 Microchip Technology Inc.
4.0
APPLICATIONS
4.1
Circuit Examples
Figure 4-3 shows a TC105 using a PNP switching
transistor (Zetex FZT749) that has an h
FE
of 180 and
V
CESAT
of 100 mV at I
C
= 1A. Other high beta transis-
tors can be used, but the values of R
B
and C
B
may
need adjustment if h
FE
is significantly different from that
of the FZT749.
The circuit of Figure 4-4 utilizes a P-channel MOSFET
switching transistor (Silconix Si9430). This transistor is
a member of the Littlefoot family of small outline
MOSFETs.
FIGURE 4-1:
SOFT START CIRCUIT
FIGURE 4-2:
EXTERNAL TRANSISTOR CONNECTION
TC105
4
SHDN
SHDN/SS
TC105
4
V
IN
C
SS
0.033
μ
F
SHDN/SS
Shutdown Not Used
R
SS
470K
Shutdown Used
ON
OFF
(From System
Control Logic)
+
+
–
–
R
SS
470K
C
SS
0.033
μ
F
TC105
1
V
IN
V
OUT
Q
L
D
C
L
EXT
C
B
R
B
TC105
1
V
IN
V
OUT
P
L
D
EXT
C
L
P-Channel MOSFET
PNP Bipolar Transistor
–
+
–
+
–
+
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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