參數(shù)資料
型號： TC105333ECTTR
元件分類： 穩(wěn)壓器
英文描述： 0.1 A SWITCHING CONTROLLER, 345 kHz SWITCHING FREQ-MAX, PDSO5
封裝： EIAJ, SC-74A, SOT-23A, 5 PIN
文件頁數(shù)： 11/14頁
文件大小： 433K
代理商： TC105333ECTTR
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 hFE of 180 and
VCESAT of 100 mV at IC = 1A. Other high beta transis-
tors can be used, but the values of RB and CB may
need adjustment if hFE 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
VIN
CSS
0.033
F
SHDN/SS
Shutdown Not Used
RSS
470K
Shutdown Used
ON
OFF
(From System
Control Logic)
+
–
RSS
470K
CSS
0.033
F
TC105
1
VIN
VOUT
Q
L
D
CL
EXT
CB
RB
TC105
1
VIN
VOUT
P
L
D
EXT
CL
P-Channel MOSFET
PNP Bipolar Transistor
–
+
–
+
–
+
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