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Table 2. Recommended Compensation Network Values at High/Low Frequency
FREQUENCY L ( µ H) V
S
(V) V
IN
± 20% (V) R
COMP
(k Ω ) C
COMP
5 100 820 pF
15
3.3 91 1.2 nF
5 68 820 pF
High (1.2 MHz) 3.3 12
3.3 68 1.2 nF
5 39 820 pF
9
3.3 39 1.2 nF
5 51 1.5 nF
15
3.3 47 2.7 nF
5 33 1.5 nF
Low (650 kHz) 6.8 12
3.3 33 2.7 nF
5 18 1.5 nF
9
3.3 18 2.7 nF
Table 2 gives conservatives Rcomp and Comp values for certain inductors, input and output voltages
providing a very stable system. For a faster response time, a higher Rcomp value can be used to enlarge
the bandwidth, as well as a slightly lower value of Ccomp to keep enough phase margin. These
adjustments should be performed in parallel with the load transient response monitoring of TPS61087.
SLVU230A – August 2008 – Revised January 2009 TPS61087EVM 3
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