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

CXSD61051 The switching frequency is programmable from 100KHz to 500KHz and the synchronous architecture provides for highly efficient designs. Current mode operation provides fast transient response and eases loop stabilization

目录

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

 

一,产品概述(General Description)   

        The CXSD61051 is a synchronous step down regulator with CC control from a high voltage input supply. Operating with an input voltage
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 architecture
provides for highly efficient designs. Current  mode operation provides fast transient response and eases loop stabilization.

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

        The CXSD61051 converters are available in the industry standard SOP8-PP packages       

二.产品特点(Features)

Wide Input Voltage Range: 8V ～ 30V

Up to 93% Efficiency

Programmable Switching Frequency up to 500KHz

No Loop Compensation Required

CC/CV control

Programmable CC Current

Thermal Shutdown

Available in SOP8-PP Package

三,应用范围 (Applications) 

Car Charger / Adaptor

LED Driver

Pre-Regulator for Linear Regulators

Distributed Power Systems

Battery ChargerCar Charger / Adaptor

LED Driver

Pre-Regulator for Linear Regulators

Distributed Power Systems

Battery Charger

四,产品封装图 (Package)

PIN	NAME	DESCRIPTION
1	FB	Feedback
2	ILIM	CC Current Settng
3	EN	Enable
4	PDRI	PMOS Gate Drive
5	NDRI	NMOS Gate Drive
6	VIN	Input Supply Voltage
7	RT	Frequency setting
8	SW	Switch Node
9	GND	Ground

五,电路原理图

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六, 产品PCB
(略)
七.产品BOM  
  (略)
八.产品PDF文档 

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九,功能概述

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

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高压同步DC-DC降压IC
型号	输入耐压	输出电压	输出电流	反馈电压	工作频率	效率	静态工 作电流	待机电流	封装
CXSD61049	8V-35V	可调输出 带线损补偿	2A/带可调恒流设置	1.21V	130K	95%	1.3mA	112uA	SOP-8
CXSD61050	8V-35V	可调输出/带线损 补偿带使能端	2A/带可调恒流设置	1.21V	130K	93%	1.3mA		SOP-8
CXSD61046	4.5-20V	可调输出	2.0A	0.923V	340K	95%	1mA	6uA	SOP-8
CXSD61046A/B	4.5-27V	可调输出	2.0A/2.5A	0.925V	340K	96%	1.3mA	0.3uA	SOP-8
CXSD61048	8V--35V	可调输出 带线损补偿	2.0A/带可调限流保护	1.2V	100-500K	93%	750uA	110uA	ESOP-8
CXSD61048A	10V--35V	可调输出 带线损补偿	2.5A/带可调限流保护	1.2V	100-500K可调	93%	15mA	110uA	SOP-8
CXSD61048B	8V-35V	可调输出 带线损补偿	2.8A/带可调限流保护	1.21V	100-500K可调	93%	15mA	110uA	SOP-8
CXSD61048C	8V-35V	可调输出 带线损补偿	3.2A/带可调限流保护	1.21V	100-500K可调	93%	15mA	110uA	SOP-8
CXSD61047	4.6-22V	可调输出	3.0A	0.923V	340K	95%	55uA	1uA	ESOP8
CXSD61047A	4.5-27V	可调输出	3.0A	0.925V	340K	93%	1.3mA	0.3uA	ESOP8
CXSD61047B	4.5V-23V	可调输出	3.5A	0.925V	340K	96%	2.5mA		ESOP-8
CXSD61051	8V-35V	可调输出 带线损补偿	扩流4.5A带 可调限流保护	1.21V	100-500K可调	95%	14mA	100uA	ESOP8
CXSD61052	3.6-40V	可调输出	2.0A	0.8V	440K	94%	74uA	0.07uA	ESOP-8
CXSD61053	4.5-20V	可调输出	4.0A	0.923V	340K	95%	1.6mA	6uA	ESOP8
CXSD61054	3.5-23V	可调输出	2.0A	0.6V	600K	96%	400uA	1uA	SOT-26
CXSD61055	4.5-17V	可调输出	2.0A	0.6V	600K	96%	400uA	1uA	SOT-26
CXSD61055A	4.5V-23V	可调输出	2.0A	0.8V	600K	92%	800uA		SOT-26
CXSD61055B	3.3-17V	可调输出	2.0A	0.6V	600K	96%	400uA	4uA	SOT-26
CXSD61056	4.5-26V	可调输出	1.2A	0.8V	1.4M	94%	600uA	1uA	SOT-26
CXSD61057	4.0-42V	可调输出	1.5A	0.8V	650K	91%	600uA	6uA	SOT-26