- 您现在的位置：买卖IC网 > PDF目录1809 > IR3640MPBF (International Rectifier)IC REG CTRLR BUCK PWM VM 20-MLPQ PDF资料下载
参数资料
| 型号： | IR3640MPBF |
| 厂商： | International Rectifier |
| 文件页数： | 14/32页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 20-MLPQ |
| 标准包装： | 100 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1.65MHz |
| 占空比： | 92% |
| 电源电压： | 4.5 V ~ 5.5 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 ~ 125°C |
| 封装/外壳： | 20-VFQFN 裸露焊盘 |
| 包装： | 管件 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页当前第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页
IR3640MPBF
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 IR3640, the typical
minimum on-time is specified as 50 ns.
Any design or application using the IR3640 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 IR3640. 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 IR3640 can operate. To allow some
margin, the maximum operating duty ratio in any
application using the IR3640 should still
accommodate about 250 ns off-time. Figure 11
shows a plot of the maximum duty ratio vs. the
switching frequency, with 250 ns off-time.
t on =
=
D
F s
V out
V in × F s
95
90
85
80
M a x Duty Cycle
In any application that uses the IR3640, the
following condition must be satisfied:
t on (min) ≤ t on
75
70
65
60
55
∴ t on (min) ≤
V out
V in × F s
250
450
650 850 1050 1250
S w itching Frequency (kH z )
1450
1650
∴ V in × F s ≤
V out
t on (min)
Fig. 11: Maximum duty cycle vs. switching
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 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 24V and minimum output voltage, the
converter should be designed at a switching
frequency that does not exceed 292 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.
06/15/2009
14
相关PDF资料 |
PDF描述 |
|---|---|
| IR3651STRPBF | IC REG CTRLR BUCK PWM VM 14-SOIC |
| IR3710MTRPBF | IC REG CTRLR BUCK PWM 16-MLPQ |
| IR3720MTRPBF | IC POWER SUPPLY MONITOR 10-DFN |
| IR3721MTRPBF | IC POWER SUPPLY MONITOR 10-DFN |
| IR3725MTRPBF | IC PWR MONITOR INPUT 12-DFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| IR3640MTRPBF | 功能描述:开关变换器、稳压器与控制器 HI FREQ SYNC PWM 4.5 to 5.5V 1.5MHz RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| IR3651 | 制造商:IRF 制造商全称:International Rectifier 功能描述: |
| IR3651SPBF | 功能描述:IC REG CTRLR BUCK PWM VM 14-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 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:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
| IR3651STRPBF | 功能描述:电压模式 PWM 控制器 High Volt Sych PWM 100V 400Mhz 1.25 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 |
| IR3651STRPBF-CUT TAPE | 制造商:IR 功能描述:IR3651SPbF Series 13.2 V 7 mA High Voltage Synchronous PWM Buck Controller |
发布紧急采购，3分钟左右您将得到回复。