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MC34063A View Datasheet(PDF) - Texas Instruments

Part NameMC34063A TI
Texas Instruments TI
Description1.5-A Peak Boost/Buck/Inverting Switching Regulators
MC34063A Datasheet PDF : 30 Pages
1 2 3 4 5 6 7 8 9 10 Next Last
MC33063A, MC34063A
SLLS636N – DECEMBER 2004 – REVISED JANUARY 2015
9 Application and Implementation
www.ti.com
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
9.1 Application Information
9.1.1 External Switch Configurations for Higher Peak Current
R*
8
1
8
1
VOUT
VOUT
7
7
2
2
RSC
VIN
6
RSC
VIN
6
7
* R 0 for constant Vin
a) EXTERNAL npn SWITCH
b) EXTERNAL npn SATURATED SWITCH (see Note A)
A. If the output switch is driven into hard saturation (non-Darlington configuration) at low switch currents (300 mA) and
high driver currents (30 mA), it may take up to 2 μs to come out of saturation. This condition will shorten the off time
at frequencies 30 kHz and is magnified at high temperatures. This condition does not occur with a Darlington
configuration because the output switch cannot saturate. If a non-Darlington configuration is used, the output drive
configuration in Figure 7b is recommended.
Figure 5. Boost Regulator Connections for IC Peak Greater Than 1.5 A
8
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