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| 型号： | LM2735XMFEVAL |
| 厂商： | National Semiconductor |
| 文件页数： | 8/58页 |
| 文件大小： | 0K |
| 描述： | BOARD DEMO FOR LM2735 SOT23-5 |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步升 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 12V |
| 电流 - 输出： | 500mA |
| 输入电压： | 3 ~ 5.5 V |
| 稳压器拓扑结构： | 升压 |
| 频率 - 开关： | 1.6MHz |
| 板类型： | 完全填充 |
| 已供物品： | 板，文档 |
| 已用 IC / 零件： | LM2735 |
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SNVS485F – JUNE 2007 – REVISED APRIL 2013
Simplified Internal Block Diagram
EN
Thermal SHDN
Control Logic
V IN
Corrective - Ramp
Oscillator
-
+
UVLO = 2.3V
SW
FB
V REF = 1.255V
cv
1.6 MHz
S
R
R
Q
NMOS
Internal
Compensation
I LIMIT
Soft-Start
I SENSE-AMP
+
-
GND
Figure 18. Simplified Block Diagram
APPLICATION INFORMATION
THEORY OF OPERATION
The LM2735 is a constant frequency PWM boost regulator IC that delivers a minimum of 2.1A peak switch
current. The regulator has a preset switching frequency of either 520 kHz or 1.60 MHz. This high frequency
allows the LM2735 to operate with small surface mount capacitors and inductors, resulting in a DC/DC converter
that requires a minimum amount of board space. The LM2735 is internally compensated, so it is simple to use,
and requires few external components. The LM2735 uses current-mode control to regulate the output voltage.
The following operating description of the LM2735 will refer to the Simplified Internal Block Diagram ( Figure 18 )
the simplified schematic ( Figure 19 ), and its associated waveforms ( Figure 20 ). The LM2735 supplies a regulated
output voltage by switching the internal NMOS control switch at constant frequency and variable duty cycle. A
switching cycle begins at the falling edge of the reset pulse generated by the internal oscillator. When this pulse
goes low, the output control logic turns on the internal NMOS control switch. During this on-time, the SW pin
voltage (V SW ) decreases to approximately GND, and the inductor current (I L ) increases with a linear slope. I L is
measured by the current sense amplifier, which generates an output proportional to the switch current. The
sensed signal is summed with the regulator’s corrective ramp and compared to the error amplifier’s output, which
is proportional to the difference between the feedback voltage and V REF . When the PWM comparator output goes
high, the output switch turns off until the next switching cycle begins. During the switch off-time, inductor current
discharges through diode D1, which forces the SW pin to swing to the output voltage plus the forward voltage
(V D ) of the diode. The regulator loop adjusts the duty cycle (D) to maintain a constant output voltage .
8
Product Folder Links: LM2735
Copyright ? 2007–2013, Texas Instruments Incorporated
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相关代理商/技术参数 |
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|---|---|
| LM2735XMFEVAL/NOPB | 功能描述:电源管理IC开发工具 LM2735XMF EVAL BOARD 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 |
| LM2735XMFX | 制造商:NSC 制造商全称:National Semiconductor 功能描述:520kHz/1.6MHz - Space-Efficient Boost and SEPIC DC-DC Regulator |
| LM2735XMFX/NOPB | 功能描述:直流/直流开关调节器 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 |
| LM2735XMY | 制造商:Texas Instruments 功能描述:Conv DC-DC Single Step Up 2.7V to 5.5V 8-Pin MSOP EP T/R 制造商:Texas Instruments 功能描述:SWITCH REG, BOOST, 1.6MHZ, MSOP8 |
| LM2735XMY/NOPB | 功能描述:直流/直流开关调节器 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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