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參數資料
| 型號： | HIP6004BCB |
| 廠商： | INTERSIL CORP |
| 元件分類： | 穩壓器 |
| 英文描述： | Buck and Synchronous-Rectifier (PWM) Controller and Output Voltage Monitor |
| 中文描述： | SWITCHING CONTROLLER, 215 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | PLASTIC, MS-013AC, SOIC-20 |
| 文件頁數： | 8/12頁 |
| 文件大小： | 339K |
| 代理商： | HIP6004BCB |
Figure 5 shows the critical power components of the converter.
To minimize the voltage overshoot the interconnecting wires
indicated by heavy lines should be part of ground or power
plane in a printed circuit board. The components shown in
Figure 5 should be located as close together as possible.
Please note that the capacitors C
IN
and C
O
each represent
numerous physical capacitors. Locate the HIP6004B within 3
inches of the MOSFETs, Q
1
and Q
2
. The circuit traces for the
MOSFETs’ gate and source connections from the HIP6004B
must be sized to handle up to 1A peak current.
Figure 6 shows the circuit traces that require additional
layout consideration. Use single point and ground plane
construction for the circuits shown. Minimize any leakage
current paths on the SS PIN and locate the capacitor, C
SS
close to the SS pin because the internal current source is
only 10
μ
A. Provide local V
CC
decoupling between V
CC
and
GND pins. Locate the capacitor, C
BOOT
as close as
practical to the BOOT and PHASE pins.
Feedback Compensation
Figure 7 highlights the voltage-mode control loop for a
synchronous-rectified buck converter. The output voltage
(V
OUT
) is regulated to the Reference voltage level. The
error amplifier (Error Amp) output (V
E/A
) is compared with
the oscillator (OSC) triangular wave to provide a pulse-
width modulated (PWM) wave with an amplitude of V
IN
at
the PHASE node.
The PWM wave is smoothed by the output filter (L
O
and C
O
).
The modulator transfer function is the small-signal transfer
function of V
OUT
/V
E/A
. This function is dominated by a DC
Gain and the output filter (L
O
and C
O
), with a double pole
break frequency at F
LC
and a zero at F
ESR
. The DC Gain
of the modulator is simply the input voltage (V
IN
) divided by
the peak-to-peak oscillator voltage
V
OSC
.
Modulator Break Frequency Equations
The compensation network consists of the error amplifier
(internal to the HIP6004B) 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 (R
1
, R
2
, R
3
, C
1
, C
2
, and C
3
) in Figure 7. Use
these guidelines for locating the poles and zeros of the
compensation network:
1. Pick Gain (R
2
/R
1
) 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.
PGND
L
O
C
O
LGATE
UGATE
PHASE
Q
1
Q
2
D
2
V
IN
V
OUT
RETURN
HIP6004B
C
IN
L
FIGURE 5. PRINTED CIRCUIT BOARD POWER AND GROUND
PLANES OR ISLANDS
FIGURE 6. PRINTED CIRCUIT BOARD SMALL SIGNAL
LAYOUT GUIDELINES
+12V
HIP6004B
SS
GND
V
CC
BOOT
D
1
L
O
C
O
V
OUT
L
Q
1
Q
2
PHASE
+V
IN
C
BOOT
C
VCC
C
SS
FIGURE 7. VOLTAGE-MODE BUCK CONVERTER
COMPENSATION DESIGN
V
OUT
REFERENCE
L
O
C
O
ESR
V
IN
V
OSC
ERROR
AMP
PWM
DRIVER
(PARASITIC)
Z
FB
+
-
DACOUT
R
1
R
3
R
2
C
3
C
2
C
1
COMP
V
OUT
FB
Z
FB
HIP6004B
Z
IN
COMPARATOR
DRIVER
DETAILED COMPENSATION COMPONENTS
PHASE
V
E/A
+
-
+
-
Z
IN
OSC
FLC
2
π
x LO x CO
------------------------------------------
=
FESR
-------------------------------------------
=
HIP6004B
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