Datasheet

8
7
6
1
2
R*
* R " 0 for constant V
in
8
7
6
1
2
V
OUT
R
SC
V
IN
R
SC
V
IN
V
OUT
a) EXTERNAL npn SWITCH b) EXTERNAL pnp SATURATED SWITCH (see Note A)
MC33063A-Q1
SLLS654B – APRIL 2005 – REVISED SEPTEMBER 2008 ................................................................................................................................................ www.ti.com
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 µ s 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 I
C
Peak Greater Than 1.5 A
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