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參數(shù)資料
| 型號(hào)： | 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)： | 14/22頁 |
| 文件大?。?/td> | 184K |
| 代理商： | CS5174ED8 |
CS5171, CS5172, CS5173, CS5174
http://onsemi.com
14
Summing up, the output voltage peakpeak ripple can be
calculated by:
(IIN
IOUT)(1
(COUT)(f)
IOUTD
(COUT)(f)
The equation can be expressed more conveniently in
terms of V
CC
, V
OUT
and I
OUT
for design purposes as
follows:
IOUT(VOUT
(COUT)(f)
VOUT(RIPPLE)
D)
IIN
ESR
VOUT(RIPPLE)
VCC)
1
(COUT)(f)
(IOUT)(VOUT)(ESR)
VCC
The capacitor RMS ripple current is:
IRIPPLE
(IIN
IOUT)2(1
D)
(IOUT)2(D)
IOUT
VOUT
VCC
VCC
Although the above equations apply only for boost
circuits, similar equations can be derived for flyback
circuits.
Reducing the Current Limit
In some applications, the designer may prefer a lower
limit on the switch current than 1.5 A. An external shunt can
be connected between the V
C
pin and ground to reduce its
clamp voltage. Consequently, the current limit of the
internal power transistor current is reduced from its nominal
value.
The voltage on the V
C
pin can be evaluated with the
equation
VC
ISWREAV
where:
R
E
= .063 , the value of the internal emitter resistor;
A
V
= 5 V/V, the gain of the current sense amplifier.
Since R
E
and A
V
cannot be changed by the end user, the
only available method for limiting switch current below
1.5 A is to clamp the V
C
pin at a lower voltage. If the
maximum switch or inductor current is substituted into the
equation above, the desired clamp voltage will result.
A simple diode clamp, as shown in Figure 37, clamps the
V
C
voltage to a diode drop above the voltage on resistor R3.
Unfortunately, such a simple circuit is not generally
acceptable if V
IN
is loosely regulated.
Figure 37. Current Limiting using a Diode Clamp
V
C
D1
V
CC
R1
V
IN
C2
C1
R2
R3
Another solution to the current limiting problem is to
externally measure the current through the switch using a
sense resistor. Such a circuit is illustrated in Figure 38.
+
Figure 38. Current Limiting using a Current Sense
Resistor
V
C
R
SENSE
Q1
V
CC
R1
V
IN
C2
C1
R2
C3
Output
Ground
PGND
AGND
The switch current is limited to
ISWITCH(PEAK)
VBE(Q1)
RSENSE
where:
V
BE(Q1)
= the baseemitter voltage drop of Q1, typically
0.65 V.
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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