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参数资料
| 型号： | ISL6420BEVAL2Z |
| 厂商： | Intersil |
| 文件页数： | 17/21页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD 2 FOR ISL6420B |
| 标准包装： | 1 |
| 系列： | * |
ISL6420B
VIN
Compensation Break Frequency Equations
F Z1 = ----------------------------------
OSC
PWM
COMPARATOR
DRIVER
L O
V OUT
1
2 π ? R 2 ? C1
(EQ. 6)
+
F P1 = -------------------------------------------------------
2 π ? R2 ? ? ---------------------- ?
+
F Z2 = ------------------------------------------------------
F P2 = ----------------------------------
Δ V OSC
-
Z FB
V E/A
-
ERROR
AMP
DRIVER
Z IN
REFERENCE
PHASE
C O
ESR
(PARASITIC)
1
C1 ? C2
? C1 + C2 ?
1
2 π ? ( R1 + R3 ) ? C3
1
2 π ? R3 ? C3
(EQ. 7)
(EQ. 8)
(EQ. 9)
1. Pick Gain (R2/R1) for desired converter bandwidth
DETAILED COMPENSATION COMPONENTS
2. Place 1 ST Zero Below Filter’s Double Pole
C 1
C 2
R 2
Z FB
C 3
Z IN
R 3
V OUT
(~75% F LC )
3. Place 2 ND Zero at Filter’s Double Pole
4. Place 1 ST Pole at the ESR Zero
5. Place 2 ND Pole at Half the Switching Frequency
COMP
-
FB
R 1
6. Check Gain against Error Amplifier’s Open-Loop
Gain
7. Estimate Phase Margin - Repeat if Necessary
+
ISL6420B
REF
R 4
Figure 18 shows an asymptotic plot of the DC/DC
converter’s gain vs. frequency. The actual Modulator Gain
has a high gain peak due to the high Q factor of the
output filter and is not shown in Figure 18. Using the
V OUT = V REF × ? 1 + ------ 1 - ?
F LC = ---------------------------------------
2 π ? L O ? C O
? R ?
? R 4 ?
FIGURE 17. VOLTAGE - MODE BUCK CONVERTER
COMPENSATION DESIGN
Modulator Break Frequency Equations
1
(EQ. 4)
previously mentioned guidelines should give a
Compensation Gain similar to the curve plotted. The
open loop error amplifier gain bounds the compensation
gain. Check the compensation gain at F P2 with the
capabilities of the error amplifier. The Loop Gain is
constructed on the log-log graph of Figure 18 by adding
the Modulator Gain (in dB) to the Compensation Gain (in
dB). This is equivalent to multiplying the modulator
transfer function to the compensation transfer function
and plotting the gain.
F ESR = ---------------------------------------------
1
2 π ? ( ESR ? C O )
(EQ. 5)
100
80
F Z1 F Z2
F P1
F P2
The compensation network consists of the error amplifier
(internal to the ISL6420B) and the impedance networks
Z IN and Z FB . The goal of the compensation network is to
provide a closed loop transfer function with the highest
0dB crossing frequency (f 0dB ) and adequate phase
margin. Phase margin is the difference between the
closed loop phase at f 0dB and 180°. The following
equations relate the compensation network’s poles, zeros
and gain to the components (R 1 , R 2 , R 3 , C 1 , C 2 , and C 3 )
in Figure 17. Use the following guidelines for locating the
poles and zeros of the compensation network.
60
40
20
0
-20
-40
-60
20LOG
(R 2 /R 1 )
MODULATOR
GAIN
10 100 1k
F LC
10k
OPEN LOOP
ERROR AMP GAIN
20LOG
(VIN/ Δ V OSC )
COMPENSATION
GAIN
CLOSED LOOP
GAIN
F ESR
100k 1M 10M
FREQUENCY (Hz)
FIGURE 18. ASYMPTOTIC BODE PLOT OF CONVERTER
GAIN
17
FN6901.1
December 4, 2009
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