MC33063A_15 Datasheet, PDF (8/30 Pages) Texas Instruments – MC3x063A 1.5-A Peak Boost/Buck/Inverting Switching Regulators

MC33063A, MC34063A
SLLS636N – DECEMBER 2004 – REVISED JANUARY 2015
9 Application and Implementation
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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
V_OUT
V_OUT
7
7
2
2
R_SC
V_IN
6
R_SC
V_IN
6
7
* R → 0 for constant V_in
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 I_C Peak Greater Than 1.5 A
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