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TYPICAL APPLICATIONS
PROTECTION AND DIAGNOSTIC FEATURES
As a result, it is possible to calculate
F SW
Gate
Driver
PWM
Comparitor
SW
L
In order to find the maximum allowed ESR,
Ramp
Generator
V REFOUT
Error
Amplifier
VOUT
INV
R S
C S
R F
R O C O
The effects of the ESR is often neglected by the designers
COMP
C X
C F
and may present a hidden danger to the ultimate supply
stability. Poor quality capacitors have widely disparate ESR
value, which can make the closed loop response
34712
Figure 9. Type III Compensation Network
inconsistent.
Consider the crossover frequency, F CROSS , of the open loop
gain at one-tenth of the switching frequency, F SW.
Io
Then,
?
F CROSS = ------------------------------
C F = ------------------------------------------
Io_step
dt_I_rise
Current
response
Worst case
assumption
10
2 ? ? RO CF
10
2 ? ? R O F CROSS
where R O is a user selected resistor. Knowing the LC
frequency, it can be obtained the values of R F and C S :
Figure 8. Transient Parameters
TYPE III COMPENSATION NETWORK
Power supplies are desired to offer accurate and tight
regulation output voltages. To accomplish this requires a high
DC gain. But with high gain comes the possibility of instability.
The purpose of adding compensation to the internal error
amplifier is to counteract some of the gains and phases
contained in the control-to-output transfer function that could
jeopardized the stability of the power supply. The Type III
compensation network used for 34712 comprises two poles
(one integrator and one high frequency pole to cancel the
zero generated from the ESR of the output capacitor) and two
zeros to cancel the two poles generated from the LC filter as
shown in Figure 9 .
This gives as a result,
&
Calculate Rs by placing the Pole 1 at the ESR zero
frequency:
34712
Analog Integrated Circuit Device Data ?
18
Freescale Semiconductor
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