MC33063A
MC34063A
www.ti.com
SLLS636L –DECEMBER 2004–REVISED DECEMBER 2009
R*
1
8
7
6
1
2
8
7
6
V
V
OUT
OUT
2
R
SC
R
SC
V
IN
V
IN
* R " 0 for constant V
in
a) EXTERNAL npn SWITCH
b) EXTERNAL pnp 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 7. External Current-Boost Connections for IC Peak Greater Than 1.5 A
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