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| 型号： | ZL2004EVK1 |
| 厂商： | Intersil |
| 文件页数： | 19/42页 |
| 文件大小： | 0K |
| 描述： | KIT EVAL FOR ZL2004 |
| 标准包装： | 1 |
| 系列： | * |
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ZL2004
Table 15. Power Supply Requirements
5.7.2 Driver Selection
Parameter
Input voltage (V IN )
Output voltage (V OUT )
Output current (I OUT )
Output voltage ripple
(V orip )
Output load step (I ostep )
Output load step rate
Output deviation due to load
step
Maximum PCB temp.
Desired efficiency
Other considerations
Range
4.5 – 14.0 V
0.6 – 3.6 V
0 to ~25 A
< 3% of V OUT
< Io
—
—
120°C
—
Various
Example
Value
12 V
1.2 V
20 A
1% of V OUT
50% of I o
10 A/μS
± 50 mV
85°C
85%
Optimize for
small size
The ZL1505 is the recommended driver IC. The
ZL1505 with integrated 30V bootstrap Schottky diode
has independent PWMH and PWML inputs to take
advantage of the dynamic dead-time control on the
ZL2004.
5.7.3 Inductor Selection
The output inductor selection process must include
several trade-offs. A high inductance value will result
in a low ripple current (I opp ), 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 magnitude (I ostep ):
5.7.1 Design Goal Trade-offs
I opp
I ostep
The design of the buck power stage requires several
compromises among size, efficiency, and cost. The
inductor core loss increases with frequency, so there is
a trade-off between a small output filter made possible
Now the output inductance can be calculated using the
following equation, where V INM is the maximum input
voltage:
V OUT
by a higher switching frequency and getting better
power supply efficiency. Size can be decreased by
increasing the switching frequency at the expense of
efficiency. Cost can be minimized by using through-
hole inductors and capacitors; however these
L OUT
V OUT
1
V INM
f sw I opp
components are physically large.
To start the design, select a switching frequency based
on Table 16. This frequency is a starting point and may
be adjusted as the design progresses.
Table 16. Circuit Design Considerations
Frequency
Efficiency Circuit Size
Range
The average inductor current is equal to the maximum
output current. The peak inductor current (I Lpk ) is
calculated using the following equation where I OUT is
the maximum output current:
I opp
I Lpk I OUT
2
Select an inductor rated for the average DC current
200 – 400 kHz
400 – 800 kHz
800 kHz –
1.4 MHz
Highest
Moderate
Lower
Larger
Smaller
Smallest
with a peak current rating above the peak current
computed above.
In over-current 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.
19
FN6846.3
February 15, 2011
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ZL2005 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Digital-DC? Integrated Power Management and Conversion IC |
| ZL2005ALNF | 制造商:Intersil Corporation 功能描述:DIGITAL DC-DC CONTROLLER W/ DRIVERS - TRAY100 - Trays 制造商:Intersil Corporation 功能描述:IC REG CNTRLR BUCK PWM 36-QFN 制造商:Intersil Corporation 功能描述:Digital DC-DC Controller w/ Drivers - BULK 50 |
| ZL2005ALNFT | 功能描述:电压模式 PWM 控制器 DIGTL DC-DC CNTRLR W/DRVRS TR100 RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| ZL2005ALNFT1 | 功能描述:电压模式 PWM 控制器 DIGTL DC-DC CNTRLR W/DRVRS TR1K RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| ZL2005P | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Digital-DC? Controller with Drivers and POLA/DOSA Trim |
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