Datasheet > 1N4148W

1N4148W

更新时间： 2024-02-27 22:14:11

品牌	Logo	应用领域
德州仪器 - TI		稳压器二极管光电二极管 IOT
页数	文件大小	规格书
31页	1178K
描述
LM2736 Thin SOT 750mA Load Step-Down DC-DC Regulator

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1N4148W 技术参数

是否Rohs认证：	符合	生命周期：	Active
Reach Compliance Code：	unknown	ECCN代码：	EAR99
HTS代码：	8541.10.00.70	风险等级：	5.76
配置：	SINGLE	二极管类型：	RECTIFIER DIODE
最大正向电压 (VF)：	0.715 V	最大非重复峰值正向电流：	2 A
元件数量：	1	最高工作温度：	150 °C
最大输出电流：	0.15 A	最大重复峰值反向电压：	75 V
最大反向恢复时间：	0.004 µs	子类别：	Rectifier Diodes
表面贴装：	YES	Base Number Matches：	1

1N4148W 数据手册

LM2736

SNVS316F –SEPTEMBER 2004–REVISED APRIL 2013

www.ti.com

D = T /T

ON SW

Voltage

OFF

Inductor

Current

Figure 20. LM2736 Waveforms of SW Pin Voltage and Inductor Current

BOOST FUNCTION

Capacitor C_BOOSTand diode D2 in Figure 21 are used to generate a voltage V_BOOST. V_BOOST- V_SWis the gate

drive voltage to the internal NMOS control switch. To properly drive the internal NMOS switch during its on-time,

V_BOOSTneeds to be at least 1.6V greater than V_SW. Although the LM2736 will operate with this minimum voltage,

it may not have sufficient gate drive to supply large values of output current. Therefore, it is recommended that

V_BOOSTbe greater than 2.5V above V_SWfor best efficiency. V_BOOST– V_SWshould not exceed the maximum

operating limit of 5.5V.

5.5V > V_BOOST– V_SW> 2.5V for best performance.

BOOST

OUT

GND

OUT

Figure 21. V_OUTCharges C_BOOST

When the LM2736 starts up, internal circuitry from the BOOST pin supplies a maximum of 20mA to C_BOOST. This

current charges C_BOOSTto a voltage sufficient to turn the switch on. The BOOST pin will continue to source

current to C_BOOSTuntil the voltage at the feedback pin is greater than 1.18V.

There are various methods to derive V_BOOST

1. From the input voltage (V_IN)

2. From the output voltage (V_OUT

)

3. From an external distributed voltage rail (V_EXT

)

4. From a shunt or series zener diode

In the Simplifed Block Diagram of Figure 19, capacitor C_BOOSTand diode D2 supply the gate-drive current for the

NMOS switch. Capacitor C_BOOSTis charged via diode D2 by V_IN. During a normal switching cycle, when the

internal NMOS control switch is off (T_OFF) (refer to Figure 20), V_BOOSTequals V_INminus the forward voltage of D2

(V_FD2), during which the current in the inductor (L) forward biases the Schottky diode D1 (V_FD1). Therefore the

voltage stored across C_BOOSTis

V_BOOST- V_SW= V_IN- V_FD2+ V_FD1

(1)

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