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| 型号： | ZL6105ALAFTK |
| 厂商： | Intersil |
| 文件页数： | 17/35页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 36-QFN |
| 标准包装： | 1,000 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1.4MHz |
| 占空比： | 95% |
| 电源电压： | 3 V ~ 14 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 36-VFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
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ZL6105
( I )
I Lrms = I OUT +
by increasing the switching frequency at the expense of
efficiency. Cost can be minimized by using through-hole
inductors and capacitors; however these components are
physically large.
I Lrms is given by Equation 9.
2 opp
12
2
(EQ. 9)
To start the design, select a switching frequency based on Table
13. This frequency is a starting point and may be adjusted as the
design progresses.
TABLE 13. CIRCUIT DESIGN CONSIDERATIONS
where I OUT is the maximum output current. Next, calculate the
core loss of the selected inductor. Since this calculation is
specific to each inductor and manufacturer, refer to the chosen
inductor datasheet. Add the core loss and the ESR loss and
compare the total loss to the maximum power dissipation
FREQUENCY RANGE
200kHz to 400kHz
400kHz to 800kHz
EFFICIENCY
Highest
Moderate
CIRCUIT SIZE
Larger
Smaller
recommendation in the inductor datasheet.
OUTPUT CAPACITOR SELECTION
Several trade-offs must also be considered when selecting an
800kHz to 1.4MHz Lower Smallest
INDUCTOR SELECTION
The output inductor selection process must include several
trade-offs. A high inductance value will result in a low ripple
current (I O(P-P) ), which will reduce output capacitance and
produce a low output ripple voltage, but may also compromise
output transient load performance. Therefore, a balance must be
struck between output ripple and optimal load transient
performance. A good starting point is to select the output
inductor ripple equal to the expected load transient step
output capacitor. Low ESR values are needed to have a small
output deviation during transient load steps (V OSAG ) and low
output voltage ripple (V ORIP ). However, capacitors with low ESR,
such as semi-stable (X5R and X7R) dielectric ceramic capacitors,
also have relatively low capacitance values. Many designs can
use a combination of high capacitance devices and low ESR
devices in parallel.
For high ripple currents, a low capacitance value can cause a
significant amount of output voltage ripple. Likewise, in high
transient load steps, a relatively large amount of capacitance is
needed to minimize the output voltage deviation while the
magnitude (I OSTEP ) as shown in Equation 5:
I opp = I ostep
(EQ. 5)
inductor current ramps up or down to the new steady state
output current value.
As a starting point, apportion one-half of the output ripple
voltage to the capacitor ESR and the other half to capacitance, as
Now the output inductance can be calculated using Equation 6:
shown in the Equations 10 and 11:
V OUT × ? ? 1 ? OUT
? ?
L OUT
=
? V
? V INM
fsw × I opp
?
?
(EQ. 6)
C OUT =
I opp
8 × f sw ×
V orip
2
(EQ. 10)
ESR =
V orip
I Lpk = I OUT +
I opp
V orip = I opp × ESR +
I opp
P LDCR = DCR × I Lrms
(EQ. 8)
I CINrms = I OUT × D × ( 1 ? D )
where V INM is the maximum input voltage.
The average inductor current is equal to the maximum output
current. The peak inductor current (I Lpk ) is calculated using
Equation 7:
(EQ. 7)
2
where I OUT is the maximum output current.
Select an inductor rated for the average DC current with a peak
current rating above the peak current computed in Equation 7.
In overcurrent or short-circuit conditions, the inductor may have
currents greater than 2x the normal maximum rated output
current. It is desirable to use an inductor that still provides some
inductance to protect the load and the MOSFETs from damaging
currents in this situation.
Once an inductor is selected, the DCR and core losses in the
inductor are calculated as in Equation 8. Use the DCR specified in
the inductor manufacturer’s datasheet.
2
17
(EQ. 11)
2 × I opp
Use these values to make an initial capacitor selection, using a
single capacitor or several capacitors in parallel.
After a capacitor has been selected, the resulting output voltage
ripple can be calculated using Equation 12:
(EQ. 12)
8 × f sw × C OUT
Because each part of this equation was made to be less than or
equal to half of the allowed output ripple voltage, the V ORIP
should be less than the desired maximum output ripple.
INPUT CAPACITOR
It is highly recommended that dedicated input capacitors be
used in any point-of-load design, even when the supply is
powered from a heavily filtered 5V or 12V “bulk” supply from an
off-line power supply. This is because of the high RMS ripple
current that is drawn by the buck converter topology. This ripple
(I CINrms ) can be determined from Equation 13:
(EQ. 13)
FN6906.5
December 19, 2013
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ZL6105ALAFTKR5546 | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| ZL6105ALAFTKR5549 | 制造商:Intersil Corporation 功能描述:ADAPTIVE DIGITAL DC-DC CONTROLLER W/ DRIVERS & I-SHARING FE0 - Tape and Reel |
| ZL6105ALAFTKR5553 | 制造商:Intersil Corporation 功能描述:ADAPTIVE DIGITAL DC-DC CONTROLLER W/ DRIVERS & I-SHARING MOD - Tape and Reel |
| ZL6105ALAFTKR5554 | 制造商:Intersil Corporation 功能描述:ADAPTIVE DIGITAL DC-DC CONTROLLER W/ DRIVERS & I-SHARING MOD - Tape and Reel |
| ZL6105ALAFTR5546 | 功能描述:IC REG CTRLR BUCK PWM VM 36-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:275kHz 占空比:50% 电源电压:18 V ~ 110 V 降压:无 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:-40°C ~ 85°C 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) |
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