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參數(shù)資料
| 型號： | ZA3020 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 2A STEP DOWN PWM SWITCH MODE DC DC REGULATORS |
| 中文描述： | 第2A降壓PWM開關(guān)模式DC DC穩(wěn)壓器 |
| 文件頁數(shù)： | 6/10頁 |
| 文件大小： | 134K |
| 代理商： | ZA3020 |
Applications Information Continued
Table 2: Diode Selection Guide
V
IN
(Max) 1A Diodes
15V
2A Diodes
30BQ15
B220
SK23
SR22
20BQ030
B230
SK23
SR23
SS23
10BQ15
1N5817
B120
SS12
20V
30V
1N5818
B130
MBRS130
SS13
Table 3: Schottky Diode Manufacturers
Vendor
Diodes, Inc.
Fairchild Semiconductor
General Semiconductor
International Rectifier
On Semiconductor
Pan Jit International
Web Site
www.diodes.com
www.fairchildsemi.com
www.gensemi.com
www.irf.com
www.onsemi.com
www.panjit.com.tw
Inductor – L1
Optimal inductor selection involves trade-offs in
electrical value, current rating and mechanical
sizing.
Table 4 lists the recommended minimum inductor
values for common output voltage values. Table 5
Selection guide lists inductors by manufacturer,
electrical value, maximum output current, DC
resistance, core type, core material and
mechanical sizing.
The Maximum current rating of the inductor should
be above the peak operating current:
I
PEAK
= I
LOAD
+ (V
OUT
)(V
IN
-V
OUT
)
2(L)(F)(V
IN
)
Example: V
IN
=12V V
OUT
=3.3V, L=15μH, I
LOAD
=1.2A
I
PEAK
= 1.6 + (3.3)(12-3.3)
2(15u)(380KHz)(12)
I
PEAK
= 1.809A
Using Table 5 select a 15μH inductor with a Max
I
DC
rating of > 1.809A.
Output Capacitor - C2
The selection of the output capacitor is the most
critical component of a switching regulator. Its
electrical value and equivalent series resistance
(ESR) directly affect:
System stability
Loop compensation components R3
and C3
Output ripple voltage
Moreover C2 is frequently the most expensive
component of a switching regulator.
Figures 3 and 4 along with Table 4 are schematics
for two C2 components that have low ESR value.
Table IV. Recommended components for standard output voltages
V
OUT
R2
L1 minimum
1.22V
1.5V
1.8V
2.5V
3.3V
5.0V
0
6.8μH
6.8μH
10μH
10μH
15μH
22μH
2.32K
4.75K
10.5K
16.9K
30.9K
ZA3020
2A Step-Down, PWM, Switch-Mode
DC-DC Regulators
ZA3020 Rev. 3.
5
2003-04-
22
www.vimicro.com
6
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ZA3020DS | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:2A STEP DOWN PWM SWITCH MODE DC DC REGULATORS |
| ZA30T-115X3.2X22.2-T42 NOR-NZ | 制造商:NORTON ABRASIVES 功能描述:CUTTING DISC FOR METAL 115X3.2X22.2MM |
| ZA30T-125X3.2X22.2-T42 NOR-NZ | 制造商:NORTON ABRASIVES 功能描述:CUTTING DISC FOR METAL 125X3.2X22.2MM |
| ZA30T-180X3.2X22.2-T42 NOR-NZ | 制造商:NORTON ABRASIVES 功能描述:CUTTING DISC FOR METAL 180X3.2X22.2MM |
| ZA30T-230X3.2X22.2-T42 NOR-NZ | 制造商:NORTON 功能描述:CUTTING DISC FOR METAL 230X3.2X22.2MM 制造商:NORTON 功能描述:CUTTING DISC, FOR METAL, 230X3.2X22.2MM |
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