- 您現(xiàn)在的位置：買(mǎi)賣(mài)IC網(wǎng) > PDF目錄33563 > 400WA10M12.5X16 (ON SEMICONDUCTOR) Low-Cost 100 mA High-Voltage Buck and Buck-Boost Using NCP1052 PDF資料下載
參數(shù)資料
| 型號(hào)： | 400WA10M12.5X16 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | Low-Cost 100 mA High-Voltage Buck and Buck-Boost Using NCP1052 |
| 中文描述： | 低成本百毫安高電壓降壓和降壓升壓使用NCP1052 |
| 文件頁(yè)數(shù)： | 4/10頁(yè) |
| 文件大?。?/td> | 93K |
| 代理商： | 400WA10M12.5X16 |
AND8098/D
http://onsemi.com
3
output voltage will rise up dramatically and burn the output
capacitor eventually. Hence, a zener diode Z1 or minimum
“dummy” load resistor is needed to consume the minimum
amount of energy as shown in Figure 1. It is also noted that
when R1 pulls up the output voltage at a given output current
condition, the output voltages at lower output current
conditions are also pulled up. Hence, the clamping zener
diode Z1 is needed to be with the breakdown voltage as same
as the output voltage but it will reduce some of the efficiency
at lower output current conditions.
DESIGN CONSIDERATION
Topology
Buck circuit is to step down a voltage. Buck-boost circuit
is to step up or down a voltage. The output voltage is
inverted. The maximum duty of NCP1052 is typically 77%.
Because of burst-mode control, the effective maximum
duty is lower and said to be 70% roughly. When a buck
converter is in continuous conduction mode (CCM), the
input voltage Vin and output voltage Vout are related by the
duty ratio D.
Vout
Vin
+ D t 0.7
(eq. 2)
The relationship in buck-boost is
Vout
Vin
+ D
1
* D t
0.7
1
* 0.7 +
2.33
(eq. 3)
Another aspect on topology is the output current. The
maximum output current is always smaller than the
maximum switch current in non-isolated topologies.
However, in isolated topologies such as flyback the
maximum output current can be increased by a transformer.
Table 1. Summary of Topology Difference Using NCP1052
Buck
Buck-boost
Flyback
Output voltage
< 0.7 Vin
Negative & < 2.33 Vin
Depending on transformer ratio
Output current
< 300 mA
<< 300 mA, output current is
only a portion of the inductor
current
< 10 W. It depends on operating
condition and audible noise level
Input voltage
< 700 V
t 700 * Vout V
t 700 V
<< 700 V. It depends on
transformer ratio
Operating mode in nominal
condition
Continuous
Discontinuous
Standby ability on VCC charging
current
Bad. The current flows through
output even if there is no load
Good. The current passes
through inductor only
Good. The current passes
through primary winding only
Transformer / Auxiliary winding
It is only for standby
improvement or additional
output
It is only for standby
improvement or additional
output
It is a must for the main output.
Additional auxiliary winding can
improve standby performance
Isolation
No
Yes. Opto coupler can be
eliminated if isolation is not
needed
Burst-mode Operation
The NCP1052 is with a burst-mode control method. It
means the MOSFET can be completely off for one or more
switching cycles. The output voltage is regulated by the
overall duration of dead time or non-dead time over a
number of switching cycles. This feature offers advantages
on saving energy in standby condition since it can reduce the
effective duty cycle dramatically. In flyback topology, the
circuit is mainly designed for discontinuous conduction
mode (DCM) in which the inductor current reaches zero in
every switching cycle. The DCM burst-mode waveform can
be represented in Figure 4. It is similar to the pulse-width
modulation (PWM) one.
Figure 4. DCM Inductor Currents in Burst Mode
and PWM Control
Burst mode
PWM
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 400WA68M18X25 | MINIATURE ALUMINUM ELECTROLYTIC CAPACITORS |
| 400WXA10M125X16 | MINIATURE ALUMINUM ELECTROLYTIC CAPACITORS |
| 400WXA10M16X16 | MINIATURE ALUMINUM ELECTROLYTIC CAPACITORS |
| 400WXA22M16X20 | MINIATURE ALUMINUM ELECTROLYTIC CAPACITORS |
| 400WXA22M18X16 | MINIATURE ALUMINUM ELECTROLYTIC CAPACITORS |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 400WA10M16X16 | 制造商:RUBYCON 制造商全稱:RUBYCON CORPORATION 功能描述:MINIATURE ALUMINUM ELECTROLYTIC CAPACITORS |
| 400WA10MEFC12.5X16 | 功能描述:CAP ALUM 10UF 400V 20% RADIAL RoHS:是 類別:電容器 >> 鋁 系列:* 標(biāo)準(zhǔn)包裝:2,000 系列:142 RHS 電容:4700µF 額定電壓:10V 容差:±20% 壽命@溫度:105°C 時(shí)為 2000 小時(shí) 工作溫度:-40°C ~ 105°C 特點(diǎn):通用 紋波電流:1.26A ESR（等效串聯(lián)電阻）:- 阻抗:- 安裝類型:通孔 封裝/外殼:徑向，Can 尺寸/尺寸:0.492" 直徑（12.50mm） 高度 - 座高（最大）:1.063"（27.00mm） 引線間隔:0.197"（5.00mm） 表面貼裝占地面積:- 包裝:散裝 |
| 400WA10MEFCG412.5X16 | 功能描述:CAP ALUM 10UF 400V 20% RADIAL RoHS:是 類別:電容器 >> 鋁 系列:* 標(biāo)準(zhǔn)包裝:2,000 系列:142 RHS 電容:4700µF 額定電壓:10V 容差:±20% 壽命@溫度:105°C 時(shí)為 2000 小時(shí) 工作溫度:-40°C ~ 105°C 特點(diǎn):通用 紋波電流:1.26A ESR（等效串聯(lián)電阻）:- 阻抗:- 安裝類型:通孔 封裝/外殼:徑向，Can 尺寸/尺寸:0.492" 直徑（12.50mm） 高度 - 座高（最大）:1.063"（27.00mm） 引線間隔:0.197"（5.00mm） 表面貼裝占地面積:- 包裝:散裝 |
| 400WA22M18X16 | 制造商:RUBYCON 制造商全稱:RUBYCON CORPORATION 功能描述:MINIATURE ALUMINUM ELECTROLYTIC CAPACITORS |
| 400WA22M8X9 | 制造商:RUBYCON 制造商全稱:RUBYCON CORPORATION 功能描述:MINIATURE ALUMINUM ELECTROLYTIC CAPACITORS |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。