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8dx嘉泰姆

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

一,产品概述(General Description)         8dx嘉泰姆

       The CXSD6292 is a single-phase, constant-on-time, and synchronous8dx嘉泰姆
PWM controller which drives N-channel MOSFETs. The CXSD6292 steps8dx嘉泰姆
down high voltage of a battery to generate low-voltage chipset or RAM supplies8dx嘉泰姆
in notebook computers.8dx嘉泰姆
        The CXSD6292 provides excellent transient response and accurate DC8dx嘉泰姆
voltage output in either PFM or PWM Mode.In Pulse Frequency Modulation8dx嘉泰姆
(PFM) Mode, the CXSD6292 provides very high efficiency over light load8dx嘉泰姆
with loading-modulated switching frequencies. When the inductor current8dx嘉泰姆
is continuous, the operation automatically enters PWM mode with relatively8dx嘉泰姆
constant switching frequency.For QFN4x4-16A and TQFN3x3-16 packages,8dx嘉泰姆
the Forced-PWM Mode works nearly at constant frequency for low-noise8dx嘉泰姆
requirements.8dx嘉泰姆
         The CXSD6292 is equipped with accurate over-current,output under-8dx嘉泰姆
voltage, and over-voltage protections per-fect for NB application. A Power-8dx嘉泰姆
On-Reset function moni-tors the voltage on VCC pin to prevent errorneous8dx嘉泰姆
opera-tion during power-on. The CXSD6292 has a digital soft-start and soft-stop.8dx嘉泰姆
The internal integrated soft-start ramps up the output voltage with controlled slew8dx嘉泰姆
rate to reduce the start-up current. The digital soft-stop function actively discharges8dx嘉泰姆
the output capacitors with controlled reverse inductor current.8dx嘉泰姆
     The CXSD6292 is available in SSOP-16, QFN4x4-16A, and TQFN3x3-16 packages8dx嘉泰姆
二.产品特点(Features)8dx嘉泰姆

1.)Adjustable Output Voltage from +0.6V to +3.3V8dx嘉泰姆
    - 0.6V Reference Voltage8dx嘉泰姆
    - ±1% Accuracy Over Temperature8dx嘉泰姆
2.)Operates from an Input Battery Voltage Range of +3V to +25V8dx嘉泰姆
3.)Wide Output Load Range from 0A to 25A8dx嘉泰姆
4.)Power-On-Reset Monitoring on VCC Pin8dx嘉泰姆
5.)Excellent Line and Load Transient Response8dx嘉泰姆
6.)PFM Mode for Increased Light Load Efficiency8dx嘉泰姆
7.)Programmable PWM Frequency from 200kHz to 600kHz8dx嘉泰姆
8.)Integrated MOSFET Drivers and Bootstrap Diode8dx嘉泰姆
9.)Internal Integrated Soft-Start and Soft-Stop8dx嘉泰姆
10.)Selectable Forced PWM or Automatic PFM/PWM8dx嘉泰姆
11.)Mode (only for QFN4x4-16A and TQFN3x3-16 Packages)8dx嘉泰姆
      Power Good Monitoring8dx嘉泰姆
12.)Fault Identification by PGOOD Pull-Down Resistance8dx嘉泰姆
13.)70% Under-Voltage Protection (UVP)8dx嘉泰姆
14.)124% Over-Voltage Protection (OVP)8dx嘉泰姆
15.)Adjustable Over-Current Protection (OCP)8dx嘉泰姆
      - Sensing Low-Side MOSFET’s Current8dx嘉泰姆
16.)Over-Temperature Protection (OTP)8dx嘉泰姆
17.)SSOP-16, Compact 4mmx4mm QFN-16 (QFN4x4-8dx嘉泰姆
     16A), and TQFN3x3-16 Packages8dx嘉泰姆
18.)Lead Free and Green Devices Available8dx嘉泰姆
三,应用范围 (Applications)8dx嘉泰姆

PCI Express Graphical Processing Unit8dx嘉泰姆
Notebook Adapter8dx嘉泰姆
Auxiliary Power Rail8dx嘉泰姆
VRM8dx嘉泰姆
四.下载产品资料PDF文档 8dx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！8dx嘉泰姆

 8dx嘉泰姆

五,产品封装图 (Package)8dx嘉泰姆

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六.电路原理图8dx嘉泰姆

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七,功能概述8dx嘉泰姆

Power Good Indicator8dx嘉泰姆
The CXSD6292 features an open-drain PGOOD output pin to indicate one of the IC’s working statuses 8dx嘉泰姆

including soft-start, under-voltage fault, over-current fault, and over-voltage faule. The unique fault-8dx嘉泰姆

identification capability can drastically reduce trouble-shooting time and effort.8dx嘉泰姆
The pull-down resistance of the PGOOD pin correspondsto the fault status of the controller. During 8dx嘉泰姆

soft-start or if an under voltage fault occurs, the PGOOD pull-down re-sistance is 95Ω, or 32Ω for 8dx嘉泰姆

an over current fault, or 63Ω for an over voltage fault. The pull-low resistance is unde-fined if VCC 8dx嘉泰姆

is below the rising/falling POR threshold.8dx嘉泰姆
Over-Temperature Protection (OTP)8dx嘉泰姆
When the junction temperature increases above the ris-ing threshold temperature TOTR, the IC 8dx嘉泰姆

will enter the over-temperature protection (OTP) state that suspends the PWM, which forces the 8dx嘉泰姆

LG and UG gate drivers to output low voltages. The status of the PGOOD pin does not change, nor8dx嘉泰姆

 does the converter latch-off. The thermal sensor allows the converters to start a start-up process 8dx嘉泰姆

and regulate the output voltage again after the junction temperature cools by 25oC. The OTP is 8dx嘉泰姆

designed with a 25oC hysteresis to lower the average TJ during continu-ous thermal overload 8dx嘉泰姆

conditions, which increases life- time of the CXSD6292.8dx嘉泰姆

Over-Current Protection (OCP) and Short-Circuit Pro-tection (SCP)8dx嘉泰姆
The over-current protection (OCP) is designed to resist the slow slew rate load current; on the other8dx嘉泰姆

 hand, the short-circuit protection (SCP) is used to take care of rapid shorted output. The setpoint for8dx嘉泰姆

 OCP and SCP is pro-grammed with resistor RSEN that is connected across the ISEN pin and drain of8dx嘉泰姆

 the low-side MOSFET. The SCP setpoint is internally set to twice the OCP setpoint.8dx嘉泰姆
The inductor current develops a negative voltage across the RDS(ON) of the low-side MOSFET that is8dx嘉泰姆

 sampled and held shortly before LG gate-driver output goes low. The OCP fault occurs if ISEN rises 8dx嘉泰姆

above the OCP threshold current IOC (typical :26μA) while attempting to null the nega-tive voltage 8dx嘉泰姆

across the PHASE and GND pins. When the ISEN exceeds IOC, the OCP counter starts to work.8dx嘉泰姆
Meanwhile, pulses on all the PWM (ISEN > IOC) remains for 20μs, the OCP will be triggered. When 8dx嘉泰姆

ISEN falls below IOC on a PWM pulses before 20μs has elapsed, the counter will be reset. The SCP8dx嘉泰姆

 fault will occur within 10μs when I SEN exceeds twice I OC. The relationship between the sampled 8dx嘉泰姆

current and MOSFET current is given by:8dx嘉泰姆
ISEN × RSEN = RDS ( ON ) × IL8dx嘉泰姆
Which means the current sensing pin will source current to make the voltage drop on the MOSFET 8dx嘉泰姆

and is equal to the voltage generated on the sensing resistor along the ISEN pin current flowing path.8dx嘉泰姆
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