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LM5574MT/NOPB

更新时间： 2024-01-12 10:57:19
品牌 Logo 应用领域
德州仪器 - TI 开关稳压器
页数 文件大小 规格书
28页 881K
描述
75V、0.5A 降压开关稳压器 | PW | 16 | -40 to 125

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LM5574MT/NOPB 技术参数

是否Rohs认证：符合生命周期：Transferred
包装说明：TSSOP, TSSOP16,.25Reach Compliance Code：compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.18Is Samacsys：N
其他特性：ALSO HAS ADJUSTABLE OUTPUT VOLTAGE AS LOW AS 1.225V模拟集成电路 - 其他类型：SWITCHING REGULATOR
控制模式：CURRENT-MODE控制技术：PULSE WIDTH MODULATION
最大输入电压：75 V最小输入电压：6 V
标称输入电压：48 VJESD-30 代码：R-PDSO-G16
JESD-609代码：e3长度：5 mm
湿度敏感等级：1功能数量：1
端子数量：16最高工作温度：125 °C
最低工作温度：-40 °C最大输出电流：0.5 A
封装主体材料：PLASTIC/EPOXY封装代码：TSSOP
封装等效代码：TSSOP16,.25封装形状：RECTANGULAR
封装形式：SMALL OUTLINE, THIN PROFILE, SHRINK PITCH峰值回流温度（摄氏度）：260
认证状态：Not Qualified座面最大高度：1.1 mm
子类别：Switching Regulator or Controllers表面贴装：YES
切换器配置：BUCK最大切换频率：545 kHz
温度等级：AUTOMOTIVE端子面层：Matte Tin (Sn)
端子形式：GULL WING端子节距：0.65 mm
端子位置：DUAL处于峰值回流温度下的最长时间：NOT SPECIFIED
宽度：4.4 mmBase Number Matches：1

LM5574MT/NOPB 数据手册

 浏览型号LM5574MT/NOPB的Datasheet PDF文件第6页浏览型号LM5574MT/NOPB的Datasheet PDF文件第7页浏览型号LM5574MT/NOPB的Datasheet PDF文件第8页浏览型号LM5574MT/NOPB的Datasheet PDF文件第10页浏览型号LM5574MT/NOPB的Datasheet PDF文件第11页浏览型号LM5574MT/NOPB的Datasheet PDF文件第12页 
LM5574, LM5574-Q1  
www.ti.com  
SNVS478F –JANUARY 2007–REVISED APRIL 2013  
An auxiliary supply voltage can be applied to the Vcc pin to reduce the IC power dissipation. If the auxiliary  
voltage is greater than 7.3V, the internal regulator will essentially shut off, reducing the IC power dissipation. The  
Vcc regulator series pass transistor includes a diode between Vcc and Vin that should not be forward biased in  
normal operation. Therefore the auxiliary Vcc voltage should never exceed the Vin voltage.  
In high voltage applications extra care should be taken to ensure the VIN pin does not exceed the absolute  
maximum voltage rating of 76V. During line or load transients, voltage ringing on the Vin line that exceeds the  
Absolute Maximum Ratings can damage the IC. Both careful PC board layout and the use of quality bypass  
capacitors located close to the VIN and GND pins are essential.  
V
IN  
9V  
V
CC  
7V  
5.25V  
Internal Enable Signal  
Figure 10. Vin and Vcc Sequencing  
Shutdown / Standby  
The LM5574 contains a dual level Shutdown (SD) circuit. When the SD pin voltage is below 0.7V, the regulator is  
in a low current shutdown mode. When the SD pin voltage is greater than 0.7V but less than 1.225V, the  
regulator is in standby mode. In standby mode the Vcc regulator is active but the output switch is disabled. When  
the SD pin voltage exceeds 1.225V, the output switch is enabled and normal operation begins. An internal 5µA  
pull-up current source configures the regulator to be fully operational if the SD pin is left open.  
An external set-point voltage divider from VIN to GND can be used to set the operational input range of the  
regulator. The divider must be designed such that the voltage at the SD pin will be greater than 1.225V when Vin  
is in the desired operating range. The internal 5µA pull-up current source must be included in calculations of the  
external set-point divider. Hysteresis of 0.1V is included for both the shutdown and standby thresholds. The SD  
pin is internally clamped with a 1kΩ resistor and an 8V zener clamp. The voltage at the SD pin should never  
exceed 14V. If the voltage at the SD pin exceeds 8V, the bias current will increase at a rate of 1 mA/V.  
The SD pin can also be used to implement various remote enable / disable functions. Pulling the SD pin below  
the 0.7V threshold totally disables the controller. If the SD pin voltage is above 1.225V the regulator will be  
operational.  
Oscillator and Sync Capability  
The LM5574 oscillator frequency is set by a single external resistor connected between the RT pin and the  
AGND pin. The RT resistor should be located very close to the device and connected directly to the pins of the IC  
(RT and AGND).To set a desired oscillator frequency (F), the necessary value for the RT resistor can be  
calculated from the following equation:  
-9  
1
F
- 580 x 10  
RT =  
135 x 10-12  
(1)  
The SYNC pin can be used to synchronize the internal oscillator to an external clock. The external clock must be  
of higher frequency than the free-running frequency set by the RT resistor. A clock circuit with an open drain  
output is the recommended interface from the external clock to the SYNC pin. The clock pulse duration should  
be greater than 15ns.  
Copyright © 2007–2013, Texas Instruments Incorporated  
Submit Documentation Feedback  
9
Product Folder Links: LM5574 LM5574-Q1  
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