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参数资料
| 型号： | IR3843AMTR1PBF |
| 厂商： | International Rectifier |
| 文件页数： | 17/33页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 3A 15QFN |
| 产品培训模块： | SupIRBuck? Family and POL Design Tools Overview |
| 标准包装： | 1 |
| 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 ~ 1.32MHz |
| 电流 - 输出： | 3A |
| 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： | 15-PowerVQFN |
| 包装： | 标准包装 |
| 供应商设备封装： | PQFN（5x6） |
| 其它名称： | IR3843AMTR1PBFDKR |
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PD-97509
IR3843AMPbF
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 IR3843A, the typical
minimum on-time is specified as 100 ns.
Any design or application using the IR3843A
must ensure operation with a pulse width that is
higher than this minimum on-time and preferably
higher than 150 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 IR3843A. 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 IR3843A can operate. To allow a
margin of 50ns, the maximum operating duty
ratio in any application using the IR3843A 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 IR3843A, 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)
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,
Switching Frequency (kHz)
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
150 ns
= 4 . 67 × 10 6 V/s
Therefore, even at the minimum switching
frequency 250 kHz, no input voltage higher than
18.5V may be reliably converted down to 0.7V
without excessive jitter or pulse skipping over the
complete load range.
In general, practical considerations dictate that
any application that demands a pulse width
smaller than 175ns may not exhibit jitter free
operation over the entire load range.
Rev 16.0
17
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IR3843AMTRPBF | 功能描述:直流/直流开关调节器 3A SupIRBuck Reg 250-1200kHz, 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 |
| IR3843WMPBF | 制造商:International Rectifier 功能描述:2A SUPIRBUCK VOLTAGE REGULATOR WITH PGOOD - Bulk |
| IR3843WMPBF_12 | 制造商:IRF 制造商全称:International Rectifier 功能描述:HIGHLY EFFICIENT INTEGRATED 2A SYNCHRONOUS BUCK REGULATOR |
| IR3843WMTR1PBF | 功能描述:直流/直流开关调节器 2A SupIRBuck Reg 250-1500kHz, 1.5-16V 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 |
| IR3843WMTRPBF | 功能描述:直流/直流开关调节器 2A SupIRBuck Reg 250-1500kHz, 1.5-16V 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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