• "

样品申请

目录jbA嘉泰姆

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

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

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

1.)Adjustable Output Voltage from +0.6V to +3.3VjbA嘉泰姆
    - 0.6V Reference VoltagejbA嘉泰姆
    - ±1% Accuracy Over TemperaturejbA嘉泰姆
2.)Operates from an Input Battery Voltage Range of +3V to +25VjbA嘉泰姆
3.)Wide Output Load Range from 0A to 25AjbA嘉泰姆
4.)Power-On-Reset Monitoring on VCC PinjbA嘉泰姆
5.)Excellent Line and Load Transient ResponsejbA嘉泰姆
6.)PFM Mode for Increased Light Load EfficiencyjbA嘉泰姆
7.)Programmable PWM Frequency from 200kHz to 600kHzjbA嘉泰姆
8.)Integrated MOSFET Drivers and Bootstrap DiodejbA嘉泰姆
9.)Internal Integrated Soft-Start and Soft-StopjbA嘉泰姆
10.)Selectable Forced PWM or Automatic PFM/PWMjbA嘉泰姆
11.)Mode (only for QFN4x4-16A and TQFN3x3-16 Packages)jbA嘉泰姆
      Power Good MonitoringjbA嘉泰姆
12.)Fault Identification by PGOOD Pull-Down ResistancejbA嘉泰姆
13.)70% Under-Voltage Protection (UVP)jbA嘉泰姆
14.)124% Over-Voltage Protection (OVP)jbA嘉泰姆
15.)Adjustable Over-Current Protection (OCP)jbA嘉泰姆
      - Sensing Low-Side MOSFET’s CurrentjbA嘉泰姆
16.)Over-Temperature Protection (OTP)jbA嘉泰姆
17.)SSOP-16, Compact 4mmx4mm QFN-16 (QFN4x4-jbA嘉泰姆
     16A), and TQFN3x3-16 PackagesjbA嘉泰姆
18.)Lead Free and Green Devices AvailablejbA嘉泰姆
三,应用范围 (Applications)jbA嘉泰姆

PCI Express Graphical Processing UnitjbA嘉泰姆
Notebook AdapterjbA嘉泰姆
Auxiliary Power RailjbA嘉泰姆
VRMjbA嘉泰姆
四.下载产品资料PDF文档 jbA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！jbA嘉泰姆

 jbA嘉泰姆

五,产品封装图 (Package)jbA嘉泰姆

jbA嘉泰姆

六.电路原理图jbA嘉泰姆

jbA嘉泰姆
七,功能概述jbA嘉泰姆

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

 jbA嘉泰姆

◀ 上一篇:CXSD6291HC CMOS电流型PWM电压控制器定频高性能电流型PWM控制器欠压锁定电路

返回顶部

下一篇▶:CXSD6293单相的时间恒定的同步的驱动N通道mosfet的PWM控制器满足低输出电压应用的要求