SC4210AIMSTR Semtech, SC4210AIMSTR Datasheet - Page 8

• Manufacturer Part Number: SC4210AIMSTR
• Manufacturer: Semtech

Specifications of SC4210AIMSTR

• Lead Free Status / RoHS Status: Not Compliant

Figure 5 shows the transient response for the circuit
described above – the ripple Vpk-pk is almost 60mVpk-
pk, which is a result of the overdamped system.
This circuit can be modified to improve transient
performance. This can be achieved by raising Rcomp until
the PM decreases to 50-60º at unity gain crossover. This
is achieved by raising Rcomp to approximately 5.6k ,
which gives a PM of 50º at a unity gain of 1MHz; see
Figure 6 for the actual circuit Bode plot taken with Ridley
Instrument.
POWER MANAGEMENT
Applications Information (Cont.)
2004 Semtech Corp.
Figure 4.
Figure 5.
8
Figure 7. is an example of how close the actual results
can be obtained with the simulation once the correct
model has been defined. Below is the P-Spice simulation
of the circuit which was built and tested with Ridley
instrument; see Figure 6.
Again, we achieved a respectable transient response,
V
see Figure 8.
OUT_RIPPLE
< 50mVpk-pk, less then 3% of the V
Figure 6.
Figure 7.
SC4210A
www.semtech.com
OUT
= 1.8V;