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TC105303ECT Datasheet(PDF) 6 Page - Microchip Technology

No. de pieza TC105303ECT
Descripción Electrónicos  PFM/PWM Step-Down DC/DC Controller
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Fabricante Electrónico  MICROCHIP [Microchip Technology]
Página de inicio  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC105303ECT Datasheet(HTML) 6 Page - Microchip Technology

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TC105
DS21349C-page 6
 2001-2012 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
µF
SHDN/SS
Shutdown Not Used
RSS
470K
Shutdown Used
ON
OFF
(From System
Control Logic)
+
+
RSS
470K
CSS
0.033
µF
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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