The JTM1547B is a high frequency, high efficiency DC to DC converter with an integrated 3A, 0.1Ω power switch capable of providing an output voltage up to 26V. The fixed 1.2MHz allows the use of small

目录 1.产品概述                       2.产品特点 3.应用范围                       4.产品封装图</a> 5.电路原理图</a>                    6.产品PDF文档  7.功能概述                        8.相关产品 一,产品概述(General Description)               The JTM1547B is a high frequency, high efficiency DC to DC converter with an integrated 3A, 0.1Ω power switch capable of providing an output voltage up to 26V. The fixed 1.2MHz allows the use of small external inductions and capacitors and provides fast transient response. It integrates Soft start, Comp,. only need few components outside.    It can be adjusted SW current limit by one resistor or one analog voltage. 二</span>.产品特点(Features) 2.3V to 6V input voltage Rangel Efficiency up to 96% 26V Boost converter with adjusted switch current 1.2Mhz fixed Switching Frequency Integrated soft-start Adjustable current limit Thermal Shutdown Under voltage Lockout SOT23-6 Package 三</span>,应用范围 (Applications)   Handheld Devices GPS Receiver Digital Still Camera Portable Applications DSL Modem PCMCIA Card TFT LCD Bias Supply 四</span>,产品封装图 (Package) PINNUMBERPINNAMEPIN DESCRIPTION1SWSwitch pin2GNDGround3FBFeedback pin4ENShutdown control input., Connect this pin to logic high level to enable the device5INInput power supply pin6OCSW current limit setting pin, Set current limit by Rset or analog voltage 五</span>,电路原理图</span> 六</span>.产品PDF文档  (责任编辑：oumao18)

JTM1547

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JTM1547B

七</span>,功能概述

The boost converter is designed for output voltage up to 26V with a switch MAX peak current
limit of 4 A. The device, which operates in a current mode scheme with quasi-constant frequency, is
externally 1.2MHZ and the minimum input voltage is 2.3 V. To control the inrush current at start-up a soft-
start pin is available.
During the on-time, the voltage across the inductor causes the current in it to rise. When the
current reaches a threshold value set by the internal GM amplifier, the power transistor is turned off, the
energy stored into the inductor is then released and the current flows through the Schottky diode
towards the output of the boost converter. The off- time is fixed for a certain Vin and Vs, and therefore
maintains the same frequency when varying these parameters.

八,相关产品
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