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參數(shù)資料
| 型號： | CS5174ED8 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.5 A 280 kHz/560 kHz Boost Regulators |
| 中文描述： | 2.4 A SWITCHING REGULATOR, 620 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | SOIC-8 |
| 文件頁數(shù)： | 13/22頁 |
| 文件大?。?/td> | 184K |
| 代理商： | CS5174ED8 |
CS5171, CS5172, CS5173, CS5174
http://onsemi.com
13
Magnetic Component Selection
When choosing a magnetic component, one must consider
factors such as peak current, core and ferrite material, output
voltage ripple, EMI, temperature range, physical size and
cost. In boost circuits, the average inductor current is the
product of output current and voltage gain (V
OUT
/V
CC
),
assuming 100% energy transfer efficiency. In continuous
conduction mode, inductor ripple current is
VCC(VOUT
(f)(L)(VOUT)
IRIPPLE
VCC)
where:
f = 280 kHz for CS5171/2 and 560 kHz for CS5173/4.
The peak inductor current is equal to average current plus
half of the ripple current, which should not cause inductor
saturation. The above equation can also be referenced when
selecting the value of the inductor based on the tolerance of
the ripple current in the circuits. Small ripple current
provides the benefits of small input capacitors and greater
output current capability. A core geometry like a rod or
barrel is prone to generating high magnetic field radiation,
but is relatively cheap and small. Other core geometries,
such as toroids, provide a closed magnetic loop to prevent
EMI.
Input Capacitor Selection
In boost circuits, the inductor becomes part of the input
filter, as shown in Figure 35. In continuous mode, the input
current waveform is triangular and does not contain a large
pulsed current, as shown in Figure 34. This reduces the
requirements imposed on the input capacitor selection.
During continuous conduction mode, the peak to peak
inductor ripple current is given in the previous section. As
we can see from Figure 34, the product of the inductor
current ripple and the input capacitor’s effective series
resistance (ESR) determine the V
CC
ripple. In most
applications, input capacitors in the range of 10 F to 100 F
with an ESR less than 0.3 work well up to a full 1.5 A
switch current.
V
CC
ripple
Figure 34. Boost Input Voltage and Current
Ripple Waveforms
I
IN
I
L
+
Figure 35. Boost Circuit Effective Input Filter
V
CC
C
IN
R
ESR
I
L
I
IN
The situation is different in a flyback circuit. The input
current is discontinuous and a significant pulsed current is
seen by the input capacitors. Therefore, there are two
requirements for capacitors in a flyback regulator: energy
storage and filtering. To maintain a stable voltage supply to
the chip, a storage capacitor larger than 20 F with low ESR
is required. To reduce the noise generated by the inductor,
insert a 1.0 F ceramic capacitor between V
CC
and ground
as close as possible to the chip.
Output Capacitor Selection
Figure 36. Typical Output Voltage Ripple
V
OUT
ripple
I
L
By examining the waveforms shown in Figure 36, we can
see that the output voltage ripple comes from two major
sources,
namely
capacitor
charging/discharging of the output capacitor. In boost
circuits, when the power switch turns off, I
L
flows into the
output capacitor causing an instant V = I
IN
×
ESR. At the
same time, current I
L
I
OUT
charges the capacitor and
increases the output voltage gradually. When the power
switch is turned on, I
L
is shunted to ground and I
OUT
discharges the output capacitor. When the I
L
ripple is small
enough, I
L
can be treated as a constant and is equal to input
current I
IN
.
ESR
and
the
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| CS5174GD8 | 1.5 A 280 kHz/560 kHz Boost Regulators |
| CS5174GDR8 | 1.5 A 280 kHz/560 kHz Boost Regulators |
| CS5172GDR8 | 1.5 A 280 kHz/560 kHz Boost Regulators |
| CS5173GDR8 | 1.5 A 280 kHz/560 kHz Boost Regulators |
| CS5172(中文) | 1.5 A 280 kHz/560 kHz Boost Regulators(1.5 A 280 kHz/560 kHz，升壓調(diào)整器) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CS5174ED8G | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1.5A High Efficiency Boost RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| CS5174EDR8 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1.5A High Efficiency RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| CS5174EDR8G | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1.5A High Efficiency Boost RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| CS5174GD8 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1.5A High Efficiency RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| CS5174GD8G | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1.5A High Efficiency Boost RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
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