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| 型号： | LMR10510YSDE/NOPB |
| 厂商： | National Semiconductor |
| 文件页数： | 8/26页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 1A 6LLP |
| 特色产品： | SIMPLE SWITCHER? DC/DC Converters |
| 标准包装： | 1 |
| 系列： | SIMPLE SWITCHER® |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.6 V ~ 4.5 V |
| 输入电压： | 3 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 3MHz |
| 电流 - 输出： | 1A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 6-WDFN 裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 6-LLP-EP（3x3） |
| 其它名称： | LMR10510YSDE/NOPBDKR |
SNVS727B – OCTOBER 2011 – REVISED APRIL 2013
Simplified Block Diagram
EN
+
-
VIN
I SENSE
ENABLE and UVLO
Thermal SHDN
I LIMIT
OVP SHDN
1 . 15 x V REF
Ramp Artificial
Control Logic
I SENSE
cv
1.6 MHz
S
R
FB
R
Q
PFET
DRIVER
Internal - Comp
SW
V REF = 0.6V
SOFT - START
Internal - LDO
GND
Figure 20.
APPLICATIONS INFORMATION
THEORY OF OPERATION
The following operating description of the LMR10510 will refer to the Simplified Block Diagram ( Figure 20 ) and to
the waveforms in Figure 21 . The LMR10510 supplies a regulated output voltage by switching the internal PMOS
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 PMOS control switch. During this on-time, the SW pin voltage (V SW ) swings up to approximately V IN , 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 sense 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 the Schottky catch
diode, which forces the SW pin to swing below ground by the forward voltage (V D ) of the Schottky catch diode.
The regulator loop adjusts the duty cycle (D) to maintain a constant output voltage.
8
Product Folder Links: LMR10510
Copyright ? 2011–2013, Texas Instruments Incorporated
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| LMR10510YSDX | 制造商:TI 制造商全称:Texas Instruments 功能描述:SIMPLE SWITCHER?? 5.5Vin, 1A Step-Down Voltage Regulator in SOT-23 and LLP |
| LMR10510YSDX/NOPB | 功能描述:直流/直流开关调节器 SIMPLE SWITCHER 5.5 Vin,1A SD Vltg Reg 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 |
| LMR10515 | 制造商:TI 制造商全称:Texas Instruments 功能描述:SIMPLE SWITCHER? 5.5Vin, 1.5A Step-Down Voltage Regulator in SOT-23 and LLP |
| LMR10515XMF | 制造商:Texas Instruments 功能描述:BUCK, 1.5A, 5.5VIN 制造商:Texas Instruments 功能描述:BUCK, 1.5A, 5.5VIN; Primary Input Voltage:5.5V; No. of Outputs:1; Output Voltage:4.5V; Output Current:1.5A; Voltage Regulator Case Style:SOT-23; No. of Pins:5; Operating Temperature Min:-40C; Operating Temperature Max:125C; SVHC:No;RoHS Compliant: Yes |
| LMR10515XMF/NOPB | 功能描述:直流/直流开关调节器 SIMPLE SWITCHER 5.5 Vin,1.5A SD Vltg Reg 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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