NCP1500
Linear Mode Operation
The NCP1500 operates as a linear regulator if the
synchronization signal is absent. The part is designed to
provide up to 50 mA nominally in this mode. Transients of
up to 100 mA can be accommodated if the thermal impact
is low. The main output is in series with an external inductor.
This can cause a lag in the transient response of the device
10
1.0
when going from light load to heavy load. A bypass
transistor is incorporated to release the energy stored in the
inductor in order to avoid oscillation within the operation
range. (Patent Pending).
The following figure shows the transient step load
response of the NCP1500 in this mode of operation.
20
0
500
1000
1500
V IN = 3.6 V
V OUT = 1.8 V
C IN = 10 m F
C OUT = 10 m F
0
? 20
0
500
1000
1500
Time ( m s)
Figure 5. Load Transient Response in Linear Mode
http://onsemi.com
7
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