目录J2Z嘉泰姆

1.产品概述                       2.产品特点J2Z嘉泰姆
3.应用范围                       4.下载产品资料PDF文档 J2Z嘉泰姆
5.产品封装图                     6.电路原理图                   J2Z嘉泰姆
7.功能概述                        8.相关产品J2Z嘉泰姆

 J2Z嘉泰姆

一,产品概述(General Description)      J2Z嘉泰姆

     The CXSD61054   is a fully in tegrated , high-efficiency  2.0A  synchronous  rectified step-down  converter.  The CXSD61054   operates at high efficiencyJ2Z嘉泰姆
over a wide output current load range.J2Z嘉泰姆

      This device offers two operation modes,PWM control and PFM ModeJ2Z嘉泰姆
switching control, which allows a high efficiency over the wider range of theJ2Z嘉泰姆
load.The  rber of readily available standard external components and isJ2Z嘉泰姆
available in an 6-pin SOT23 ROHS compliant package.J2Z嘉泰姆

二.产品特点(Features)J2Z嘉泰姆

* High Efficiency: Up to 95%J2Z嘉泰姆
* 600KHz Frequency OperationJ2Z嘉泰姆
* 2.0A Output CurrentJ2Z嘉泰姆
* No Schottky Diode RequiredJ2Z嘉泰姆
* 3.5V to 18V Input Voltage RangeJ2Z嘉泰姆
* 0.6V ReferenceJ2Z嘉泰姆
 Slope Compensated Current ModeJ2Z嘉泰姆
 Control for Excellent Line and LoadJ2Z嘉泰姆
 Transient ResponseJ2Z嘉泰姆
* Integrated internal compensationJ2Z嘉泰姆
* Stable with Low ESR Ceramic OutputJ2Z嘉泰姆
   CapacitorsJ2Z嘉泰姆
* Over Current Protection withJ2Z嘉泰姆
    Hiccup-ModeJ2Z嘉泰姆
* Input over voltage protection(OVP)J2Z嘉泰姆
*  Thermal ShutdownJ2Z嘉泰姆
*  Inrush Current Limit and Soft StartJ2Z嘉泰姆
*  Available in SOT23-6 PackageJ2Z嘉泰姆
*  -40°C to +85°C Temperature RangeJ2Z嘉泰姆
三,应用范围 (Applications)J2Z嘉泰姆

Distributed Power SystemsJ2Z嘉泰姆
Digital Set Top BoxesJ2Z嘉泰姆
Flat Panel Television and MonitorsJ2Z嘉泰姆
Wireless and DSL ModemsJ2Z嘉泰姆
Notebook ComputerJ2Z嘉泰姆
四.技术规格书下载（产品PDF）J2Z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！J2Z嘉泰姆

 J2Z嘉泰姆

五,产品封装图 (Package)J2Z嘉泰姆

J2Z嘉泰姆
六.电路原理图J2Z嘉泰姆
J2Z嘉泰姆
七,功能概述J2Z嘉泰姆

Internal Regulator J2Z嘉泰姆
The CXSD61054   is a current mode step down DC/DC converter that provides excellentJ2Z嘉泰姆
transient response with no extra external compensation components. This device containsJ2Z嘉泰姆
an internal, low resistance, high voltage power MOSFET, and operates at a high 600KJ2Z嘉泰姆
operating frequency to ensure a compact, high efficiency design with excellent AC and DCJ2Z嘉泰姆
performance.J2Z嘉泰姆

Error AmplifierJ2Z嘉泰姆
The error amplifier compares the FB pin voltage with the internal FB reference (VFB) andJ2Z嘉泰姆
outputs a current proportional to the difference between the two. This output current is thenJ2Z嘉泰姆
used to charge or discharge the internal compensation network to form the COMP voltage,J2Z嘉泰姆
which is used to control the power MOSFET current. The optimized internal compensationJ2Z嘉泰姆
network minimizes the external component counts and simplifies the control loop design. J2Z嘉泰姆
Internal Soft-StartJ2Z嘉泰姆
The soft-start is implemented to prevent the converter output voltage from overshootingJ2Z嘉泰姆
during startup. When the chip starts, the internal circuitry generates a soft-start voltage (SS)J2Z嘉泰姆
ramping up from 0V to 0.6V. When it is lower than the internal reference (REF), SSJ2Z嘉泰姆
overrides REF so the error amplifier uses SS as the reference. When SS is higher thanJ2Z嘉泰姆
REF, REF regains control. The SS time is internally fixed to 1 ms.J2Z嘉泰姆
Over-Current-Protection and HiccupJ2Z嘉泰姆
The JTM2234 has cycle-by-cycle over current limit when the inductor current peak valueJ2Z嘉泰姆
exceeds the set current limit threshold. Meanwhile, output voltage starts to drop until FB isJ2Z嘉泰姆
below the Under-Voltage (UV) threshold, typically 30% below the reference. Once a UV isJ2Z嘉泰姆
triggered, the JTM2234 enters hiccup mode to periodically restart the part. ThisJ2Z嘉泰姆
protection mode is especially useful when the output is dead-short to ground. The averageJ2Z嘉泰姆
short circuit current is greatly reduced to alleviate the thermal issue and to protect theJ2Z嘉泰姆
regulator. The JTM2234 exits the hiccup mode once the over current condition isJ2Z嘉泰姆
removed. J2Z嘉泰姆
Startup and Shutdown J2Z嘉泰姆
If both VIN and EN are higher than their appropriate thresholds, the chip starts. TheJ2Z嘉泰姆
reference block starts first, generating stable reference voltage and currents, and then theJ2Z嘉泰姆
internal regulator is enabled. The regulator provides stable supply for the remainingJ2Z嘉泰姆
八,相关芯片选择指南               更多同类产品......J2Z嘉泰姆

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