CXSD6292单相恒定时间和同步PWM控制器驱动N通道mosfet降低电池的高压低压芯片

目录XoS嘉泰姆

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

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

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

1.)Adjustable Output Voltage from +0.6V to +3.3VXoS嘉泰姆
    - 0.6V Reference VoltageXoS嘉泰姆
    - ±1% Accuracy Over TemperatureXoS嘉泰姆
2.)Operates from an Input Battery Voltage Range of +3V to +25VXoS嘉泰姆
3.)Wide Output Load Range from 0A to 25AXoS嘉泰姆
4.)Power-On-Reset Monitoring on VCC PinXoS嘉泰姆
5.)Excellent Line and Load Transient ResponseXoS嘉泰姆
6.)PFM Mode for Increased Light Load EfficiencyXoS嘉泰姆
7.)Programmable PWM Frequency from 200kHz to 600kHzXoS嘉泰姆
8.)Integrated MOSFET Drivers and Bootstrap DiodeXoS嘉泰姆
9.)Internal Integrated Soft-Start and Soft-StopXoS嘉泰姆
10.)Selectable Forced PWM or Automatic PFM/PWMXoS嘉泰姆
11.)Mode (only for QFN4x4-16A and TQFN3x3-16 Packages)XoS嘉泰姆
      Power Good MonitoringXoS嘉泰姆
12.)Fault Identification by PGOOD Pull-Down ResistanceXoS嘉泰姆
13.)70% Under-Voltage Protection (UVP)XoS嘉泰姆
14.)124% Over-Voltage Protection (OVP)XoS嘉泰姆
15.)Adjustable Over-Current Protection (OCP)XoS嘉泰姆
      - Sensing Low-Side MOSFET’s CurrentXoS嘉泰姆
16.)Over-Temperature Protection (OTP)XoS嘉泰姆
17.)SSOP-16, Compact 4mmx4mm QFN-16 (QFN4x4-XoS嘉泰姆
     16A), and TQFN3x3-16 PackagesXoS嘉泰姆
18.)Lead Free and Green Devices AvailableXoS嘉泰姆
三,应用范围 (Applications)XoS嘉泰姆

PCI Express Graphical Processing UnitXoS嘉泰姆
Notebook AdapterXoS嘉泰姆
Auxiliary Power RailXoS嘉泰姆
VRMXoS嘉泰姆
四.下载产品资料PDF文档 XoS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！XoS嘉泰姆

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五,产品封装图 (Package)XoS嘉泰姆

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六.电路原理图XoS嘉泰姆

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七,功能概述XoS嘉泰姆

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

and is equal to the voltage generated on the sensing resistor along the ISEN pin current flowing path.XoS嘉泰姆
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