脉冲宽度调制CXSD6284/A 6通道频率可设置电压模式DC/DC控制IC高性能便携式数码相机提供完整的电源解决方案

目录s0v嘉泰姆

1.产品概述         2.产品特点s0v嘉泰姆
3.应用范围       4.下载产品资料PDF文档 s0v嘉泰姆
5.产品封装图                     6.电路原理图             s0v嘉泰姆
7.功能概述       8.相关产品s0v嘉泰姆

一,产品概述(General Description) s0v嘉泰姆

The CXSD6284/A is a 6-channel, frequency-settable, volt-age-mode, DC/DC control IC providing a complete power supply solution for high-performance portable digital cameras. The CXSD6284/A uses pulse-width-modulations0v嘉泰姆

(PWM) and synchronous rectification for high efficiency step-up, step-down, up-down, and inverting converters with free input and output settings in 2 or 4-cell AA, 1-cell lithium-ion (Li+), and dual-battery designs. The CXSD6284/A incorporates error amplifiers, output short-circuit detection, under-voltage lockout, soft-start, and output switch control into a chip. s0v嘉泰姆

The CXSD6284/A improves performance, component count, and size compared to conventional multi-channel controllers.s0v嘉泰姆

The CXSD6284/A has a power-good indicator (PGOOD)that signals when CH1 output is within ±10% of the set voltage by monitoring IN1 pin.s0v嘉泰姆
The CXSD6284/A is available in compact 48-pin plastic LQFP and TQFN packages.s0v嘉泰姆
二.产品特点(Features) s0v嘉泰姆

1.)Supports for Synchronous Rectifications0v嘉泰姆
(CH1, CH2, and CH5)s0v嘉泰姆
2.)Supports for Down or Up-Down Zeta Conversionss0v嘉泰姆
(CH1 and JTMA7095 CH2)s0v嘉泰姆
3.)Supports for Up, Flyback, or Up-Down SEPICs0v嘉泰姆
4.)Conversions (JTMA7095A CH2, CH3, JTMA7095s0v嘉泰姆
CH4, CH5, and CH6)s0v嘉泰姆
5.)Supports for Inverting Conversions0v嘉泰姆
(JTMA7095A CH4)s0v嘉泰姆
6.)Low Start-up Voltage : 1.4V (CH6)s0v嘉泰姆
7.)Power Supply Voltage Ranges0v嘉泰姆
- CH1 to CH5 : 3.0V to 6.5Vs0v嘉泰姆
- CH6 : 2.4V to 6.5Vs0v嘉泰姆
8.)1% Reference Voltage Accuracys0v嘉泰姆
9.)Wide Operating Frequency 100kHz to 1MHzs0v嘉泰姆
10.)Soft-Start Function (CH1 to 6)s0v嘉泰姆
11.)Power Good (PGOOD) Indicator for CH1s0v嘉泰姆
12.)Low Shutdown Currents0v嘉泰姆
13.)Output Short-Circuit Detectionss0v嘉泰姆
14.)Lead Free and Green Devices Availables0v嘉泰姆
三,应用范围 (Applications)s0v嘉泰姆

Digital Cameras0v嘉泰姆
Camcorders0v嘉泰姆
Hand-Held Instruments0v嘉泰姆
四.下载产品资料PDF文档 s0v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！s0v嘉泰姆

QQ截图20160419174301.jpg s0v嘉泰姆

s0v嘉泰姆

五,产品封装图 (Package)s0v嘉泰姆

六.电路原理图

七,功能概述

General
The CXSD6284/A provides voltage-mode feedback con-trols for six DC/DC PWM converters
(CH1 to CH6). Each channel operates with an error amplifier, PWM comparator,short-circuit
comparator, ON/OFF control, and output driver. An internal temperature-compensated voltage
pro-vides reference voltages for each channel. An triangular-wave oscillator(CT) with a timing
resistor and capacitor generates triangular waves to each channel. A inverting amplifier(CH4)
cooperates with the error amplifier for an inverting converter (with negative output voltage) .
Reference Voltage
The CXSD6284 outputs a temperature- compensated ref-erence voltage(2.49V) at VREF pin.
It is regulated from the voltage at VCC pin and can source current of max.1mA to external loads.
It also supplies bias for the IC’s internal circuitry.
Triangular-wave Oscillator
The triangular-wave oscillator is designed to generates a triangular oscillation signal (CT) with amplitude
of 0.3V~0.8V at CT pin, providing signal to CH6. The oscilla-tor frequency is settable from 100kHz to 1MHz
and set by a timing resistor and a timing capacitor connected re-spectively from RT and CT pins to ground.
Additional two triangular oscillation signals (CT1 and CT2) are also in-ternally generated with amplitude of
1.1V~1.8V. The CT1 is in phase with the CT to the PWM comparators of CH2 and CH4; the CT2 is out of
phase with the CT to the PWM comparators of CH1, CH3, and CH5.
Error Amplifier
The error amplifier is designed with unit-gain-bandwidth of 1MHz and to satisfy wide application requirements. It works with enternal resistor-capacitor network for each converter’s feedback compensation. The loop gain can be set by connecting a feedback resistor and capacitor from the output pin(FB) to inverted input pin of the error amplifier for stable operations.
Inverting Amplifier (Inv Amp)
The inverting amplifier detects the inverting DC/DC con-verter output voltage (as a negative voltage) and outputs a control signal to the error amp.

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