APW34063
Typical Application Circuits (Cont.)
External Current Boost Connections for IC Peak Greater than 1.5A
8
7
RSC
VIN
6
1
VOUT
8
7
2
RSC
VIN
6
R
1
VOUT
2
R 0 for
constant VIN
External NPN Switch
External NPN Saturated Switch (see Note5)
Note :
5.If the output switch is driven into hard saturation (non-Darlington configuration) at low switch currents (≤300mA) and high driver
currents (≥30mA), it may take up to 2.0µs to come out of saturation. This condition will shorten the off time at frequencies≥30kHz, and
is magnified at high temperatures. This condition does not occur with a Darlington configuration, since the output switch cannot
saturate. If a non-Darlington configuration is used, the following output drive condition is recommended.
Copyright © ANPEC Electronics Corp.
5
Rev. A.3 - May., 2005
www.anpec.com.tw