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| 型号： | HIP6019BEVAL1 |
| 厂商： | Intersil |
| 文件页数： | 10/15页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD 1 FOR HIP6019B |
| 标准包装： | 1 |
| 系列： | * |
HIP6019B
TABLE 1.
capacitors between the MOSFETs and the load. Locate the
PIN NAME
NOMINAL
OUT1
VOLTAGE
PWM controller close to the MOSFETs.
+5V IN
VID4
VID3
VID2
VID1
VID0
DACOUT
C IN
+12V
R
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
1
1
0
0
0
1
0
1
0
2.3
2.4
2.5
2.6
2.7
V OUT2
C OCSET2
R OCSET2
Q3
L OUT2
C VCC
VCC GND
OCSET2
OCSET1
UGATE2
UGATE1
PHASE2
C OCSET1
OCSET1
Q1
L OUT1
V OUT1
1
0
1
1
1
2.8
PHASE1
1
1
1
0
0
0
1
1
1
1
0
0
0
1
0
2.9
3.0
3.1
C OUT2
Q4
V OUT3
HIP6019B
LGATE1
GATE3
SS
PGND
Q2
C OUT1
CR1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
0
0
1
0
1
0
3.2
3.3
3.4
3.5
C SS
KEY
ISLAND ON POWER PLANE LAYER
NOTE: 0 = connected to GND or V SS , 1 = open or connected to 5V
through pull-up resistors.
Layout Considerations
MOSFETs switch very fast and efficiently. The speed with
which the current transitions from one device to another
causes voltage spikes across the interconnecting
impedances and parasitic circuit elements. The voltage
spikes can degrade efficiency, radiate noise into the circuit,
and lead to device over-voltage stress. Careful component
layout and printed circuit design minimizes the voltage
spikes in the converter. Consider, as an example, the turnoff
transition of the upper MOSFET. Prior to turnoff, the upper
MOSFET was carrying the full load current. During the
turnoff, current stops flowing in the upper MOSFET and is
picked up by the lower MOSFET or Schottky diode. Any
inductance in the switched current path generates a large
voltage spike during the switching interval. Careful
component selection, tight layout of the critical components,
and short, wide circuit traces minimize the magnitude of
voltage spikes. Contact Intersil for evaluation board
drawings of the component placement and printed circuit
board.
There are two sets of critical components in a DC-DC converter
using a HIP6019B controller. The power components are the
most critical because they switch large amounts of energy. The
critical small signal components connect to sensitive nodes or
supply critical bypassing current.
The power components should be placed first. Locate the
input capacitors close to the power switches. Minimize the
length of the connections between the input capacitors and
the power switches. Locate the output inductor and output
10
ISLAND ON CIRCUIT PLANE LAYER
VIA CONNECTION TO GROUND PLANE
FIGURE 10. PRINTED CIRCUIT BOARD POWER PLANES AND
ISLANDS
The critical small signal components include the bypass
capacitor for VCC and the soft-start capacitor, C SS . Locate
these components close to their connecting pins on the
control IC. Minimize any leakage current paths from SS
node because the internal current source is only 11 μ A.
A multi-layer printed circuit board is recommended. Figure 10
shows the connections of the critical components in the
converter. Note that capacitors C IN and C OUT could each
represent numerous physical capacitors. Dedicate one solid
layer for a ground plane and make all critical component
ground connections with vias to this layer. Dedicate another
solid layer as a power plane and break this plane into smaller
islands of common voltage levels. The power plane should
support the input power and output power nodes. Use copper
filled polygons on the top and bottom circuit layers for the
phase nodes. Use the remaining printed circuit layers for
small signal wiring. The wiring traces from the control IC to the
MOSFET gate and source should be sized to carry 1A
currents. The traces for OUT4 need only be sized for 0.2A.
Locate C OUT4 close to the HIP6019B IC.
PWM Controller Feedback Compensation
Both PWM controllers use voltage-mode control for output
regulation. This section highlights the design consideration
for a voltage-mode controller. Apply the methods and
considerations to both PWM controllers.
Figure 11 highlights the voltage-mode control loop for a
synchronous-rectified buck converter. The output voltage is
regulated to the reference voltage level. The reference
voltage level is the DAC output voltage for PWM1 and is
1.265V for PWM2. The error amplifier output (V E /A ) is
FN4587.1
April 13, 2005
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相关代理商/技术参数 |
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|---|---|
| HIP6019CB | 制造商:Harris Corporation 功能描述: |
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| HIP6020 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Advanced Dual PWM and Dual Linear Power Controller |
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