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nrW嘉泰姆

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

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

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

1.)Adjustable Output Voltage from +0.6V to +3.3VnrW嘉泰姆
    - 0.6V Reference VoltagenrW嘉泰姆
    - ±1% Accuracy Over TemperaturenrW嘉泰姆
2.)Operates from an Input Battery Voltage Range of +3V to +25VnrW嘉泰姆
3.)Wide Output Load Range from 0A to 25AnrW嘉泰姆
4.)Power-On-Reset Monitoring on VCC PinnrW嘉泰姆
5.)Excellent Line and Load Transient ResponsenrW嘉泰姆
6.)PFM Mode for Increased Light Load EfficiencynrW嘉泰姆
7.)Programmable PWM Frequency from 200kHz to 600kHznrW嘉泰姆
8.)Integrated MOSFET Drivers and Bootstrap DiodenrW嘉泰姆
9.)Internal Integrated Soft-Start and Soft-StopnrW嘉泰姆
10.)Selectable Forced PWM or Automatic PFM/PWMnrW嘉泰姆
11.)Mode (only for QFN4x4-16A and TQFN3x3-16 Packages)nrW嘉泰姆
      Power Good MonitoringnrW嘉泰姆
12.)Fault Identification by PGOOD Pull-Down ResistancenrW嘉泰姆
13.)70% Under-Voltage Protection (UVP)nrW嘉泰姆
14.)124% Over-Voltage Protection (OVP)nrW嘉泰姆
15.)Adjustable Over-Current Protection (OCP)nrW嘉泰姆
      - Sensing Low-Side MOSFET’s CurrentnrW嘉泰姆
16.)Over-Temperature Protection (OTP)nrW嘉泰姆
17.)SSOP-16, Compact 4mmx4mm QFN-16 (QFN4x4-nrW嘉泰姆
     16A), and TQFN3x3-16 PackagesnrW嘉泰姆
18.)Lead Free and Green Devices AvailablenrW嘉泰姆
三,应用范围 (Applications)nrW嘉泰姆

PCI Express Graphical Processing UnitnrW嘉泰姆
Notebook AdapternrW嘉泰姆
Auxiliary Power RailnrW嘉泰姆
VRMnrW嘉泰姆
四.下载产品资料PDF文档 nrW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！nrW嘉泰姆

 nrW嘉泰姆

五,产品封装图 (Package)nrW嘉泰姆

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六.电路原理图nrW嘉泰姆

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七,功能概述nrW嘉泰姆

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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