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参数资料
| 型号： | IR3856MTRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 18/35页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 6A 17PQFN |
| 产品培训模块： | SupIRBuck? Family and POL Design Tools Overview |
| 标准包装： | 4,000 |
| 系列： | SupIRBuck™ |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.7 V ~ 18.9 V |
| 输入电压： | 1.5 V ~ 21 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 225kHz ~ 1.65MHz |
| 电流 - 输出： | 6A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 17-PowerVQFN |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 17-PQFN（4x5） |
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PD-97528
IR3856MPbF
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 IR3856, the typical
minimum on-time is specified as 50 ns.
Any design or application using the IR3856 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 IR3856. 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 IR3856 can operate. To allow a margin
of 50ns, the maximum operating duty ratio in any
application using the IR3856 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
80
75
M a x Duty Cycle
In any application that uses the IR3856, the
following condition must be satisfied:
70
65
60
t on (min) ≤ t on
55
250
450
650
850
1050
1250
1450
1650
∴ t on (min) ≤
V out
V in × F s
S w itchin g Freq uency (kH z )
Fig. 11. Maximum duty cycle v/s switching
∴ V in × F s ≤
V out
t on (min)
frequency.
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,
∴ V in × F s ≤
∴ V in × F s ≤
V out (min)
t on (min)
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 333 kHz.
Conversely, for operation at the maximum
recommended operating frequency 1.65 MHz
and minimum output voltage, any voltage above
4.2 V may not be stepped down without pulse-
skipping.
Rev 4.0
18
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IR3856WMPBF | 制造商:IRF 制造商全称:International Rectifier 功能描述:HIGHLY EFFICIENT INTEGRATED 6A, SYNCHRONOUS BUCK REGULATOR |
| IR3856WMTR1PBF | 功能描述:直流/直流开关调节器 6A SupIRBuck Reg 750kHz, 1.5-16V in RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| IR3856WMTRPBF | 功能描述:直流/直流开关调节器 6A SupIRBuck Reg 750kHz, 1.5-16V in RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| IR3859MPBF | 制造商:IRF 制造商全称:International Rectifier 功能描述:HIGHLY EFFICIENT INTEGRATED 9A, SYNCHRONOUS BUCK REGULATOR |
| IR3859MTR1PBF | 功能描述:直流/直流开关调节器 9A SupIRBuck Reg 250-1500kHz, 1.5-21V RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
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