- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄366904 > CS5422GD16 Analog IC PDF資料下載
參數(shù)資料
| 型號： | CS5422GD16 |
| 英文描述： | Analog IC |
| 中文描述： | 模擬IC |
| 文件頁數(shù)： | 8/16頁 |
| 文件大?。?/td> | 116K |
| 代理商： | CS5422GD16 |
CS5421
http://onsemi.com
8
3. output voltage change due to the ESR and ESL of the
bulk and high frequency decoupling capacitors,
circuit traces, and vias;
4. output voltage ripple and noise.
Budgeting the tolerance is left up to the designer who must
take into account all of the above effects and provide an
output voltage that will meet the specified tolerance at the
load.
The designer must also ensure that the regulator
component temperatures are kept within the manufacturer’s
specified ratings at full load and maximum ambient
temperature.
Selecting Feedback Divider Resistors
Figure 6. Selecting Feedback Divider Resistors
V
OUT
R1
R2
V
FB
The feedback pins (V
FB1(2)
) are connected to
externalresistor dividers to set the output voltages. The error
amplifier is referenced to 1.0 V and the output voltage is
determined by selecting resistor divider values. Resistor R1
is selected based on a design trade–off between efficiency
and output voltage accuracy. The output voltage error can be
estimated due to the bias current of the error amplifier
neglecting resistor tolerance:
10 6
1.0
Error%
1
R1
100%
R2 can be sized after R1 has been determined:
R1V1.0
R2
1.0
Calculating Duty Cycle
The duty cycle of a buck converter (including parasitic
losses) is given by the formula:
VOUT
VIN
Duty Cycle
D
(VHFET
VL)
VLFET
VHFET
VL
where:
V
OUT
= buck regulator output voltage;
V
HFET
= high side FET voltage drop due to R
DS(ON)
;
V
L
= output inductor voltage drop due to inductor wire
DC resistance;
V
IN
= buck regulator input voltage;
V
LFET
= low side FET voltage drop due to R
DS(ON)
.
Figure 7. Switching Frequency
10
20
30
40
50
60
100
200
300
400
500
600
700
800
R
OSC (k )
F
Selecting the Switching Frequency
Selecting the switching frequency is a trade–off between
component size and power losses. Operation at higher
switching frequencies allows the use of smaller inductor and
capacitor values. Nevertheless, it is common to select lower
frequency operation because a higher frequency results in
lower efficiency due to MOSFET gate charge losses.
Additionally, the use of smaller inductors at higher
frequencies results in higher ripple current, higher output
voltage ripple, and lower efficiency at light load currents.
The value of the oscillator resistor is designed to be
linearly related to the switching period. If the designer
prefers not to use Figure 7 to select the necessary resistor, the
following equation quite accurately predicts the proper
resistance for room temperature conditions.
21700
ROSC
fSW
2.31fSW
where:
R
OSC
= oscillator resistor in k
;
f
SW
= switching frequency in kHz.
Selection of the Output Inductor
The inductor should be selected based on its inductance,
current capability, and DC resistance. Increasing the
inductor value will decrease output voltage ripple, but
degrade transient response. There are many factors to
consider in selecting the inductor including cost, efficiency,
EMI and ease of manufacture. The inductor must be able to
handle the peak current at the switching frequency without
saturating, and the copper resistance in the winding should
be kept as low as possible to minimize resistive power loss.
There are a variety of materials and types of magnetic
cores that could be used for this application. Among them
are ferrites, molypermalloy cores (MPP), amorphous and
powdered iron cores. Powdered iron cores are very
commonly used. Powdered iron cores are very suitable due
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| CS5422GDR16 | Analog IC |
| CS5422GDWF24 | Analog IC |
| CS5422GDWFR24 | Analog IC |
| CS5480 | Converter IC |
| CS5481 | Converter IC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CS5422GDR16 | 功能描述:IC REG CTRLR BUCK PWM 16-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR) |
| CS5422GDWF24 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:Dual Out−of−Phase Synchronous Buck Controller with Current Limit |
| CS5422GDWFR24 | 功能描述:IC REG CTRLR BUCK PWM 24-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR) |
| CS5431-4 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Optoelectronic |
| CS5441-4 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Optoelectronic |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。