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参数资料
| 型号： | IRDC3856W |
| 厂商： | International Rectifier |
| 文件页数： | 17/34页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL SUPIRBUCK IR3856W |
| 产品培训模块： | SupIRBuck? Family and POL Design Tools Overview |
| 标准包装： | 1 |
| 系列： | SupIRBuck™ |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 1.8V |
| 电流 - 输出： | 6A |
| 输入电压： | 12V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 600kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | IR3856W |
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PD-97506
IR3856WMPbF
Minimum on time Considerations
The minimum ON time is the shortest amount of
time for which the Control FET may be reliably
turned on, and this depends on the internal
timing delays. For the IR3856W, the typical
minimum on-time is specified as 50 ns.
Any design or application using the IR3856W
must ensure operation with a pulse width that is
higher than this minimum on-time and preferably
higher than 100 ns. This is necessary for the
circuit to operate without jitter and pulse-
skipping, which can cause high inductor current
ripple and high output voltage ripple.
Maximum Duty Ratio Considerations
A fixed off-time of 200 ns maximum is specified
for the IR3856W. This provides an upper limit on
the operating duty ratio at any given switching
frequency. It is clear that, higher the switching
frequency, the lower is the maximum duty ratio at
which the IR3856W can operate. To allow a
margin of 50 ns, the maximum operating duty
ratio in any application using the IR3856W
should still accommodate about 250 ns off-time.
Fig 10. shows a plot of the maximum duty ratio
v/s the switching frequency, with 250 ns off-time.
t on =
=
D
F s
V out
V in × F s
95
90
85
In any application that uses the IR3856W, the
following condition must be satisfied:
t on (min) ≤ t on
80
75
∴ t on (min) ≤
V out
V in × F s
70
300
400
500
600
700
800
900
1000
1100
1200
∴ V in × F s ≤
V out
t on (min)
Switching Frequency (kHz)
The minimum output voltage is limited by the
reference voltage and hence V out(min) = 0.7 V.
Therefore, for V out(min) = 0.7 V,
Fig. 10. Maximum duty cycle v/s switching
frequency.
∴ V in × F s ≤
V out (min)
t on (min)
∴ V in × F s ≤
0.7 V
100 ns
= 7 × 10 6 V/s
Therefore, at the maximum recommended input
voltage 21V and minimum output voltage, the
converter should be designed at a switching
frequency that does not exceed 330 kHz.
Conversely, for operation at the maximum
recommended operating frequency 1.2 MHz and
minimum output voltage, any voltage above
5.83V may not be stepped down reliably without
pulse-skipping.
Rev 9.0
17
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IRDC3859 | 功能描述:电源管理IC开发工具 User Guide IR3859 Eval Brd RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
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