CXSD61051 synchronous step down regulator CC control from a high voltage input supply 3.5A continuous output current

目录2vy嘉泰姆

1.产品概述                       2.产品特点2vy嘉泰姆
3.应用范围                       4.产品封装图2vy嘉泰姆
5.电路原理图                   6.产品PCB                   2vy嘉泰姆
7.产品BOM                      8.产品PDF文档 2vy嘉泰姆
9.功能概述                      10.相关产品2vy嘉泰姆

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一,产品概述(General Description)   2vy嘉泰姆

        The CXSD61051 is a synchronous step down regulator with CC control from a high voltage input supply. Operating with an input voltage2vy嘉泰姆
range of 8V ～ 30V, the CXSD61051 achieves 3.5A continuous output current with excellent load and line regulation. The switching  frequency is programmable from 100KHz to 500KHz and the synchronous architecture2vy嘉泰姆
provides for highly efficient designs. Current  mode operation provides fast transient response and eases loop stabilization.2vy嘉泰姆

         The CXSD61051 requires a minimum number of readily available standard external components. Other features include cable compensation programmable current limit and thermal shutdown.2vy嘉泰姆

        The CXSD61051 converters are available in the industry standard SOP8-PP packages       2vy嘉泰姆

二.产品特点(Features)2vy嘉泰姆

Wide Input Voltage Range: 8V ～ 30V2vy嘉泰姆

Up to 93% Efficiency2vy嘉泰姆

Programmable Switching Frequency up to 500KHz2vy嘉泰姆

No Loop Compensation Required2vy嘉泰姆

CC/CV control2vy嘉泰姆

Programmable CC Current2vy嘉泰姆

Thermal Shutdown2vy嘉泰姆

Available in SOP8-PP Package2vy嘉泰姆

三,应用范围 (Applications) 2vy嘉泰姆

Car Charger / Adaptor2vy嘉泰姆

LED Driver2vy嘉泰姆

Pre-Regulator for Linear Regulators2vy嘉泰姆

Distributed Power Systems2vy嘉泰姆

Battery ChargerCar Charger / Adaptor2vy嘉泰姆

LED Driver2vy嘉泰姆

Pre-Regulator for Linear Regulators2vy嘉泰姆

Distributed Power Systems2vy嘉泰姆

Battery Charger2vy嘉泰姆

四,产品封装图 (Package)2vy嘉泰姆
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五,电路原理图2vy嘉泰姆

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六, 产品PCB2vy嘉泰姆
(略)2vy嘉泰姆
七.产品BOM  2vy嘉泰姆
  (略)2vy嘉泰姆
八.产品PDF文档 2vy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！2vy嘉泰姆

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九,功能概述2vy嘉泰姆

Application Information 2vy嘉泰姆
The CXSD61051 operates by a constant frequency, current mode architecture. The output voltage is set2vy嘉泰姆
by an external divider returned to the FB pin. An error amplifier compares the divided output voltage with2vy嘉泰姆
a reference voltage of 1.21V and adjusts the peak inductor current accordingly. 2vy嘉泰姆
Thermal Protection2vy嘉泰姆
The total power dissipation in CXSD61051 is limited by a thermal protection circuit. When the device2vy嘉泰姆
temperature rises to approximately +160°C, this circuit turns off the output, allowing the IC to cool. The2vy嘉泰姆
thermal protection circuit can protect the device from being damaged by overheating in the event of fault2vy嘉泰姆
conditions. Continuously running the CXSD61051 into thermal shutdown degrades device reliability. 2vy嘉泰姆
Current Limit2vy嘉泰姆
Current limit detection occurs during the off-time by monitoring the current through the low-side switch2vy嘉泰姆
using an external resistor, RLIM. The current limit value is defined by RLIM. If during the off-time the2vy嘉泰姆
current in the low-side switch exceeds the user defined current limit value, the next on-time cycle is2vy嘉泰姆
immediately terminated. Current sensing is achieved by comparing the voltage across the low side FET2vy嘉泰姆
with the voltage across the current limit set resistor RLIM. For example, the current limit value is 4.5A by2vy嘉泰姆
the RLIM =100K. The current limit value rises when the set resistor RLIM rises. The maximum output2vy嘉泰姆
current is set by RLIM: RLIM (kΩ) = 1500 · IMAX (A) / RDS_PMOS (mΩ). 2vy嘉泰姆
Oscillator Frequency2vy嘉泰姆
The CXSD61051 oscillator frequency is set by a single external resistor connected between the RT pin and2vy嘉泰姆
the GND pin. The resistor should be located very close to the device and connected directly to the pins2vy嘉泰姆
of the IC (RT and GND). An internal amplifier holds the RT pin at a fixed voltage typically 0.6V. The2vy嘉泰姆
oscillator frequency rises when the resistor RT falls. To determine the timing resistance for a given2vy嘉泰姆
switching frequency, use the equation below:2vy嘉泰姆
RT(kΩ)= 22000 /fOSC(kHz) 2vy嘉泰姆
Setting Output Voltage2vy嘉泰姆
The output voltage is set with a resistor divider from the output node to the FB pin. It is recommended to2vy嘉泰姆
use divider resistors with 1% tolerance or better. To improve efficiency at very light loads consider using2vy嘉泰姆
larger value resistors. If the values are too high the regulator is more susceptible to noise and voltage2vy嘉泰姆
errors from the FB input current are noticeable. For most applications, a resistor in the 10kΩ to 1MΩ2vy嘉泰姆
range is suggested for R3. R2 is then given by:2vy嘉泰姆
R2 = R3 · [(VOUT / VREF) – 1]2vy嘉泰姆
where VREF is 1.21V.2vy嘉泰姆
Output Cable Resistance Compensation2vy嘉泰姆
To compensate for resistive voltage drop across the charger's output cable, the CXSD61051 integrates a2vy嘉泰姆
simple, user-programmable cable voltage drop compensation using the impedance at the FB pin.2vy嘉泰姆
Choose the proper feedback resistance values for cable compensation refer to the curve in Figure 1.2vy嘉泰姆
The delta VOUT voltage rises when the feedback resistance R3 value rises, use the equation below2vy嘉泰姆
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