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參數(shù)資料
| 型號： | HIP6005 |
| 廠商： | Intersil Corporation |
| 英文描述： | Buck Pulse-Width Modulator (PWM) Controller and Output Voltage Monitor(脈沖帶寬調(diào)節(jié)控制和輸出電壓檢測電路) |
| 中文描述： | 降壓脈寬調(diào)制（PWM）控制器和輸出電壓監(jiān)視器（脈沖帶寬調(diào)節(jié)控制和輸出電壓檢測電路） |
| 文件頁數(shù)： | 8/12頁 |
| 文件大小： | 203K |
| 代理商： | HIP6005 |
8
The compensation network consists of the error amplifier
(internal to the HIP6005) 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 degrees
.
The equations below relate
the compensation network’s poles, zeros and gain to the
components (R1, R2, R3, C1, C2, and C3) in Figure 8. Use
these guidelines for locating the poles and zeros of the
compensation network:
1. Pick Gain (R2/R1) for desired converter bandwidth
2. Place 1
ST
Zero Below Filter’s Double Pole (~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
6. Check Gain against Error Amplifier’s Open-Loop Gain
7. Estimate Phase Margin - Repeat if Necessary
Compensation Break Frequency Equations
Figure 9 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 9. Using the above 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 Closed Loop Gain is constructed on
the log-log graph of Figure 9 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.
The compensation gain uses external impedance networks
Z
FB
and Z
IN
to provide a stable, high bandwidth (BW) overall
loop. A stable control loop has a gain crossing with
-20dB/decade slope and a phase margin greater than 45
degrees. Include worst case component variations when
determining phase margin.
Component Selection Guidelines
Output Capacitor Selection
An output capacitor is required to filter the output and supply
the load transient current. The filtering requirements are a
function of the switching frequency and the ripple current.
The load transient requirements are a function of the slew
rate (di/dt) and the magnitude of the transient load current.
These requirements are generally met with a mix of
capacitors and careful layout.
Modern microprocessors produce transient load rates above
1A/ns. High frequency capacitors initially supply the transient
and slow the current load rate seen by the bulk capacitors.
The bulk filter capacitor values are generally determined by
the ESR (effective series resistance) and voltage rating
requirements rather than actual capacitance requirements.
High frequency decoupling capacitors should be placed as
close to the power pins of the load as physically possible. Be
V
OUT
OSC
REFERENCE
L
O
C
O
ESR
V
IN
V
OSC
ERROR
AMP
PWM
DRIVER
(PARASITIC)
FIGURE 8. VOLTAGE-MODE BUCK CONVERTER COMPEN-
SATION DESIGN
Z
IN
Z
FB
DACOUT
R1
R3
R2
C3
C2
C1
COMP
V
OUT
FB
Z
FB
HIP6005
Z
IN
COMPARATOR
DETAILED COMPENSATION COMPONENTS
V
E/A
+
-
+
-
+
-
PHASE
F
Z2
R3
)
C3
-------------------------+
=
F
P1
2
π
R2
--------+
------------------------------------------------------
=
F
P2
----------------------------------
=
F
Z1
----------------------------------
=
100
80
60
40
20
0
-20
-40
-60
F
P1
F
Z2
10M
1M
100K
10K
1K
100
10
OPEN LOOP
ERROR AMP GAIN
F
Z1
F
P2
F
LC
F
ESR
COMPENSATION
GAIN
G
FREQUENCY (Hz)
20LOG
(V
IN
/
V
OSC
)
MODULATOR
GAIN
FIGURE 9. ASYMPTOTIC BODE PLOT OF CONVERTER GAIN
20LOG
(R
2
/R
1
)
CLOSED LOOP
GAIN
HIP6005
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HIP6006 | Buck and Synchronous-Rectifier Pulse-Width Modulator (PWM) Controller |
| HIP6006CB | Buck and Synchronous-Rectifier Pulse-Width Modulator (PWM) Controller |
| HIP6007 | Buck Pulse-Width Modulator (PWM) Controller |
| HIP6007CB | Buck Pulse-Width Modulator (PWM) Controller |
| HIP6008 | Buck Pulse-Width Modulator (PWM) Controller and Output Voltage Monitor |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HIP6005A | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Buck Pulse-Width Modulator (PWM) Controller and Output Voltage Monitor |
| HIP6005ACB | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| HIP6005ACB-T | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| HIP6005B | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Buck Pulse-Width Modulator (PWM) Controller and Output Voltage Monitor |
| HIP6005BCB | 制造商:Rochester Electronics LLC 功能描述:PWM CONTROLLER 3.5 TO 1.3V DAC RANGE,20LD SOIC - Bulk |
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