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| 型号： | ADM00360 |
| 厂商： | Microchip Technology |
| 文件页数： | 19/38页 |
| 文件大小： | 0K |
| 描述： | BOARD DEMO FOR MCP16301 D2PAK |
| 设计资源： | ADM00360 Bill of Materials ADM00360 Schematic |
| 特色产品： | MCP16301 Demo Boards |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 3.3V |
| 电流 - 输出： | 300mA |
| 输入电压： | 4 ~ 26 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 500kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | MCP16301 |
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MCP16301
TABLE 5-3:
MCP16301 RECOMMENDED
5.7
Freewheeling Diode
3.3V INDUCTORS
The freewheeling diode creates a path for inductor cur-
Part Number
Coilcraft ?
Size
WxLxH
(mm)
rent flow after the internal switch is turned off. The aver-
age diode current is dependent upon output load
current at duty cycle (D). The efficiency of the converter
is a function of the forward drop and speed of the free-
wheeling diode. A low forward drop Schottky diode is
ME3220
LPS4414
LPS6235
MSS6132
MSS7341
ME3220
XFL2006
LPS3015
Wurth Elektronik ?
744028
15
15
15
15
15
15
15
15
15
0.52
0.440
0.125
0.135
0.057
0.520
2.02
0.700
0.750
0.90
0.92
2.00
1.56
1.78
0.8
0.25
0.61
0.35
3.2x2.521.0
4.3x4.3x1.4
6.0x6.0x3.5
6.1x6.1x3.2
7.3x7.3x4.1
2.8x3.2x2.0
2.0x2.0x0.6
3.0x3.0x1.4
2.8x2.8x1.1
recommended. The current rating and voltage rating of
the diode is application dependent. The diode voltage
rating should be a minimum of V IN , plus margin. For
example, a diode rating of 40V should be used for an
application with a maximum input of 30V. The average
EQUATION 5-6: DIODE AVERAGE
CURRENT
I D1AVG = ( 1 – D ) × I OUT
744029
15
0.600
0.42 2.8x2.8x1.35
EXAMPLE 5-4:
744025
744031
744042
Coiltronics ?
SD12
SD18
15
15
15
15
15
0.400 0.900 2.8x2.8x2.8
0.255 0.450 3.8x3.8x1.65
0.175 0.75 4.8x4.8x1.8
0.48 0.692 5.2x5.2x1.2
0.266 0.831 5.2x5.2x1.8
I OUT
V IN
V OUT
D
I D1AVG
= 0.5A
= 15V
= 5V
= 5/15
= 333 mA
SD20
15
0.193 0.718 5.2x5.2x2.0
A 0.5A to 1A diode is recommended.
SD3118
SD52
15
15
0.51
0.189
0.75
0.88
3.2x3.2x1.8
5.2x5.5.2.0
TABLE 5-4:
FREEWHEELING DIODES
Sumida ?
CDPH4D19F
CDRH2D09C
CDRH2D162D
CDRH3D161H
TDK - EPC ?
VLF3012A
VLF30251
VLF4012A
15
15
15
15
15
15
15
0.075
0.52
0.198
0.328
0.54
0.5
0.46
0.66
0.24
0.35
0.65
0.41
0.47
0.63
5.2x5.2x2.0
3.2x3.2x1.0
3.2x3.2x1.8
4.0x4.0x1.8
2.8x2.6x1.2
2.5x3.0x1.2
3.5x3.7x1.2
App
12 V IN
600 mA
24 V IN
100 mA
18 V IN
600 mA
5.8
Manufacturer
Diodes
Inc.
Diodes
Inc.
Diodes
Inc.
Boost Diode
Part
Number
DFLS120L-7
B0540Ws-7
B130L-13-F
Rating
20V, 1A
40V, 0.5A
30V, 1A
VLF5014A
B82462G4332M
15
15
0.28
0.097
0.97
1.05
4.5x4.7x1.4
6x6x2.2
The boost diode is used to provide a charging path from
the low voltage gate drive source, while the switch
node is low. The boost diode blocks the high voltage of
the switch node from feeding back into the output volt-
age when the switch is turned on, forcing the switch
node high.
A standard 1N4148 ultra-fast diode is recommended
for its recovery speed, high voltage blocking capability,
availability and cost. The voltage rating required for the
boost diode is V IN .
For low boost voltage applications, a small Schottky
diode with the appropriately rated voltage can be used
to lower the forward drop, increasing the boost supply
for gate drive.
? 2011 Microchip Technology Inc.
DS25004A-page 19
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