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目录2kT嘉泰姆

1.产品概述                       2.产品特点2kT嘉泰姆
3.应用范围                       4.下载产品资料PDF文档 2kT嘉泰姆
5.产品封装图                     6.电路原理图                   2kT嘉泰姆
7.功能概述                        8.相关产品2kT嘉泰姆

 2kT嘉泰姆

一,产品概述(General Description)      2kT嘉泰姆

     The JTM2234 is a fully in tegrated , high-efficiency  2.0A  synchronous  rectified step-down  converter.  The JTM2234 operates at high efficiency2kT嘉泰姆
over a wide output current load range.2kT嘉泰姆

      This device offers two operation modes,PWM control and PFM Mode2kT嘉泰姆
switching control, which allows a high efficiency over the wider range of the2kT嘉泰姆
load.The  rber of readily available standard external components and is2kT嘉泰姆
available in an 6-pin SOT23 ROHS compliant package.2kT嘉泰姆

二.产品特点(Features)2kT嘉泰姆

* High Efficiency: Up to 95%2kT嘉泰姆
* 600KHz Frequency Operation2kT嘉泰姆
* 2.0A Output Current2kT嘉泰姆
* No Schottky Diode Required2kT嘉泰姆
* 3.5V to 18V Input Voltage Range2kT嘉泰姆
* 0.6V Reference2kT嘉泰姆
 Slope Compensated Current Mode2kT嘉泰姆
 Control for Excellent Line and Load2kT嘉泰姆
 Transient Response2kT嘉泰姆
* Integrated internal compensation2kT嘉泰姆
* Stable with Low ESR Ceramic Output2kT嘉泰姆
   Capacitors2kT嘉泰姆
* Over Current Protection with2kT嘉泰姆
    Hiccup-Mode2kT嘉泰姆
* Input over voltage protection(OVP)2kT嘉泰姆
*  Thermal Shutdown2kT嘉泰姆
*  Inrush Current Limit and Soft Start2kT嘉泰姆
*  Available in SOT23-6 Package2kT嘉泰姆
*  -40°C to +85°C Temperature Range2kT嘉泰姆
三,应用范围 (Applications)2kT嘉泰姆

Distributed Power Systems2kT嘉泰姆
Digital Set Top Boxes2kT嘉泰姆
Flat Panel Television and Monitors2kT嘉泰姆
Wireless and DSL Modems2kT嘉泰姆
Notebook Computer2kT嘉泰姆
四.技术规格书下载（产品PDF）2kT嘉泰姆

需要详细的PDF规格书请扫一扫微信联系我们，还可以获得免费样品以及技术支持！2kT嘉泰姆

 2kT嘉泰姆

五,产品封装图 (Package)2kT嘉泰姆

2kT嘉泰姆
六.电路原理图2kT嘉泰姆
2kT嘉泰姆
七,功能概述2kT嘉泰姆

Internal Regulator 2kT嘉泰姆
The JTM2234 is a current mode step down DC/DC converter that provides excellent2kT嘉泰姆
transient response with no extra external compensation components. This device contains2kT嘉泰姆
an internal, low resistance, high voltage power MOSFET, and operates at a high 600K2kT嘉泰姆
operating frequency to ensure a compact, high efficiency design with excellent AC and DC2kT嘉泰姆
performance.2kT嘉泰姆

Error Amplifier2kT嘉泰姆
The error amplifier compares the FB pin voltage with the internal FB reference (VFB) and2kT嘉泰姆
outputs a current proportional to the difference between the two. This output current is then2kT嘉泰姆
used to charge or discharge the internal compensation network to form the COMP voltage,2kT嘉泰姆
which is used to control the power MOSFET current. The optimized internal compensation2kT嘉泰姆
network minimizes the external component counts and simplifies the control loop design. 2kT嘉泰姆
Internal Soft-Start2kT嘉泰姆
The soft-start is implemented to prevent the converter output voltage from overshooting2kT嘉泰姆
during startup. When the chip starts, the internal circuitry generates a soft-start voltage (SS)2kT嘉泰姆
ramping up from 0V to 0.6V. When it is lower than the internal reference (REF), SS2kT嘉泰姆
overrides REF so the error amplifier uses SS as the reference. When SS is higher than2kT嘉泰姆
REF, REF regains control. The SS time is internally fixed to 1 ms.2kT嘉泰姆
Over-Current-Protection and Hiccup2kT嘉泰姆
The JTM2234 has cycle-by-cycle over current limit when the inductor current peak value2kT嘉泰姆
exceeds the set current limit threshold. Meanwhile, output voltage starts to drop until FB is2kT嘉泰姆
below the Under-Voltage (UV) threshold, typically 30% below the reference. Once a UV is2kT嘉泰姆
triggered, the JTM2234 enters hiccup mode to periodically restart the part. This2kT嘉泰姆
protection mode is especially useful when the output is dead-short to ground. The average2kT嘉泰姆
short circuit current is greatly reduced to alleviate the thermal issue and to protect the2kT嘉泰姆
regulator. The JTM2234 exits the hiccup mode once the over current condition is2kT嘉泰姆
removed. 2kT嘉泰姆
Startup and Shutdown 2kT嘉泰姆
If both VIN and EN are higher than their appropriate thresholds, the chip starts. The2kT嘉泰姆
reference block starts first, generating stable reference voltage and currents, and then the2kT嘉泰姆
internal regulator is enabled. The regulator provides stable supply for the remaining2kT嘉泰姆
八,相关芯片选择指南               更多同类产品......2kT嘉泰姆

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