目录ua1嘉泰姆

1.产品概述                       2.产品特点ua1嘉泰姆
3.应用范围                       4.下载产品资料PDF文档 ua1嘉泰姆
5.产品封装图                     6.电路原理图                   ua1嘉泰姆
7.功能概述                        8.相关产品ua1嘉泰姆

一,产品概述(General Description)         ua1嘉泰姆

       The CXSD6292 is a single-phase, constant-on-time, and synchronousua1嘉泰姆
PWM controller which drives N-channel MOSFETs. The CXSD6292 stepsua1嘉泰姆
down high voltage of a battery to generate low-voltage chipset or RAM suppliesua1嘉泰姆
in notebook computers.ua1嘉泰姆
        The CXSD6292 provides excellent transient response and accurate DCua1嘉泰姆
voltage output in either PFM or PWM Mode.In Pulse Frequency Modulationua1嘉泰姆
(PFM) Mode, the CXSD6292 provides very high efficiency over light loadua1嘉泰姆
with loading-modulated switching frequencies. When the inductor currentua1嘉泰姆
is continuous, the operation automatically enters PWM mode with relativelyua1嘉泰姆
constant switching frequency.For QFN4x4-16A and TQFN3x3-16 packages,ua1嘉泰姆
the Forced-PWM Mode works nearly at constant frequency for low-noiseua1嘉泰姆
requirements.ua1嘉泰姆
         The CXSD6292 is equipped with accurate over-current,output under-ua1嘉泰姆
voltage, and over-voltage protections per-fect for NB application. A Power-ua1嘉泰姆
On-Reset function moni-tors the voltage on VCC pin to prevent errorneousua1嘉泰姆
opera-tion during power-on. The CXSD6292 has a digital soft-start and soft-stop.ua1嘉泰姆
The internal integrated soft-start ramps up the output voltage with controlled slewua1嘉泰姆
rate to reduce the start-up current. The digital soft-stop function actively dischargesua1嘉泰姆
the output capacitors with controlled reverse inductor current.ua1嘉泰姆
     The CXSD6292 is available in SSOP-16, QFN4x4-16A, and TQFN3x3-16 packagesua1嘉泰姆
二.产品特点(Features)ua1嘉泰姆

1.)Adjustable Output Voltage from +0.6V to +3.3Vua1嘉泰姆
    - 0.6V Reference Voltageua1嘉泰姆
    - ±1% Accuracy Over Temperatureua1嘉泰姆
2.)Operates from an Input Battery Voltage Range of +3V to +25Vua1嘉泰姆
3.)Wide Output Load Range from 0A to 25Aua1嘉泰姆
4.)Power-On-Reset Monitoring on VCC Pinua1嘉泰姆
5.)Excellent Line and Load Transient Responseua1嘉泰姆
6.)PFM Mode for Increased Light Load Efficiencyua1嘉泰姆
7.)Programmable PWM Frequency from 200kHz to 600kHzua1嘉泰姆
8.)Integrated MOSFET Drivers and Bootstrap Diodeua1嘉泰姆
9.)Internal Integrated Soft-Start and Soft-Stopua1嘉泰姆
10.)Selectable Forced PWM or Automatic PFM/PWMua1嘉泰姆
11.)Mode (only for QFN4x4-16A and TQFN3x3-16 Packages)ua1嘉泰姆
      Power Good Monitoringua1嘉泰姆
12.)Fault Identification by PGOOD Pull-Down Resistanceua1嘉泰姆
13.)70% Under-Voltage Protection (UVP)ua1嘉泰姆
14.)124% Over-Voltage Protection (OVP)ua1嘉泰姆
15.)Adjustable Over-Current Protection (OCP)ua1嘉泰姆
      - Sensing Low-Side MOSFET’s Currentua1嘉泰姆
16.)Over-Temperature Protection (OTP)ua1嘉泰姆
17.)SSOP-16, Compact 4mmx4mm QFN-16 (QFN4x4-ua1嘉泰姆
     16A), and TQFN3x3-16 Packagesua1嘉泰姆
18.)Lead Free and Green Devices Availableua1嘉泰姆
三,应用范围 (Applications)ua1嘉泰姆

PCI Express Graphical Processing Unitua1嘉泰姆
Notebook Adapterua1嘉泰姆
Auxiliary Power Railua1嘉泰姆
VRMua1嘉泰姆
四.下载产品资料PDF文档 ua1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！ua1嘉泰姆

 ua1嘉泰姆

五,产品封装图 (Package)ua1嘉泰姆

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六.电路原理图ua1嘉泰姆

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七,功能概述ua1嘉泰姆

Power Good Indicatorua1嘉泰姆
The CXSD6292 features an open-drain PGOOD output pin to indicate one of the IC’s working statuses ua1嘉泰姆

including soft-start, under-voltage fault, over-current fault, and over-voltage faule. The unique fault-ua1嘉泰姆

identification capability can drastically reduce trouble-shooting time and effort.ua1嘉泰姆
The pull-down resistance of the PGOOD pin correspondsto the fault status of the controller. During ua1嘉泰姆

soft-start or if an under voltage fault occurs, the PGOOD pull-down re-sistance is 95Ω, or 32Ω for ua1嘉泰姆

an over current fault, or 63Ω for an over voltage fault. The pull-low resistance is unde-fined if VCC ua1嘉泰姆

is below the rising/falling POR threshold.ua1嘉泰姆
Over-Temperature Protection (OTP)ua1嘉泰姆
When the junction temperature increases above the ris-ing threshold temperature TOTR, the IC ua1嘉泰姆

will enter the over-temperature protection (OTP) state that suspends the PWM, which forces the ua1嘉泰姆

LG and UG gate drivers to output low voltages. The status of the PGOOD pin does not change, norua1嘉泰姆

 does the converter latch-off. The thermal sensor allows the converters to start a start-up process ua1嘉泰姆

and regulate the output voltage again after the junction temperature cools by 25oC. The OTP is ua1嘉泰姆

designed with a 25oC hysteresis to lower the average TJ during continu-ous thermal overload ua1嘉泰姆

conditions, which increases life- time of the CXSD6292.ua1嘉泰姆

Over-Current Protection (OCP) and Short-Circuit Pro-tection (SCP)ua1嘉泰姆
The over-current protection (OCP) is designed to resist the slow slew rate load current; on the otherua1嘉泰姆

 hand, the short-circuit protection (SCP) is used to take care of rapid shorted output. The setpoint forua1嘉泰姆

 OCP and SCP is pro-grammed with resistor RSEN that is connected across the ISEN pin and drain ofua1嘉泰姆

 the low-side MOSFET. The SCP setpoint is internally set to twice the OCP setpoint.ua1嘉泰姆
The inductor current develops a negative voltage across the RDS(ON) of the low-side MOSFET that isua1嘉泰姆

 sampled and held shortly before LG gate-driver output goes low. The OCP fault occurs if ISEN rises ua1嘉泰姆

above the OCP threshold current IOC (typical :26μA) while attempting to null the nega-tive voltage ua1嘉泰姆

across the PHASE and GND pins. When the ISEN exceeds IOC, the OCP counter starts to work.ua1嘉泰姆
Meanwhile, pulses on all the PWM (ISEN > IOC) remains for 20μs, the OCP will be triggered. When ua1嘉泰姆

ISEN falls below IOC on a PWM pulses before 20μs has elapsed, the counter will be reset. The SCPua1嘉泰姆

 fault will occur within 10μs when I SEN exceeds twice I OC. The relationship between the sampled ua1嘉泰姆

current and MOSFET current is given by:ua1嘉泰姆
ISEN × RSEN = RDS ( ON ) × ILua1嘉泰姆
Which means the current sensing pin will source current to make the voltage drop on the MOSFET ua1嘉泰姆

and is equal to the voltage generated on the sensing resistor along the ISEN pin current flowing path.ua1嘉泰姆
八,相关产品                  更多同类产品...... ua1嘉泰姆

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