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4Nr嘉泰姆

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

一,产品概述(General Description)         4Nr嘉泰姆

       The CXSD6292 is a single-phase, constant-on-time, and synchronous4Nr嘉泰姆
PWM controller which drives N-channel MOSFETs. The CXSD6292 steps4Nr嘉泰姆
down high voltage of a battery to generate low-voltage chipset or RAM supplies4Nr嘉泰姆
in notebook computers.4Nr嘉泰姆
        The CXSD6292 provides excellent transient response and accurate DC4Nr嘉泰姆
voltage output in either PFM or PWM Mode.In Pulse Frequency Modulation4Nr嘉泰姆
(PFM) Mode, the CXSD6292 provides very high efficiency over light load4Nr嘉泰姆
with loading-modulated switching frequencies. When the inductor current4Nr嘉泰姆
is continuous, the operation automatically enters PWM mode with relatively4Nr嘉泰姆
constant switching frequency.For QFN4x4-16A and TQFN3x3-16 packages,4Nr嘉泰姆
the Forced-PWM Mode works nearly at constant frequency for low-noise4Nr嘉泰姆
requirements.4Nr嘉泰姆
         The CXSD6292 is equipped with accurate over-current,output under-4Nr嘉泰姆
voltage, and over-voltage protections per-fect for NB application. A Power-4Nr嘉泰姆
On-Reset function moni-tors the voltage on VCC pin to prevent errorneous4Nr嘉泰姆
opera-tion during power-on. The CXSD6292 has a digital soft-start and soft-stop.4Nr嘉泰姆
The internal integrated soft-start ramps up the output voltage with controlled slew4Nr嘉泰姆
rate to reduce the start-up current. The digital soft-stop function actively discharges4Nr嘉泰姆
the output capacitors with controlled reverse inductor current.4Nr嘉泰姆
     The CXSD6292 is available in SSOP-16, QFN4x4-16A, and TQFN3x3-16 packages4Nr嘉泰姆
二.产品特点(Features)4Nr嘉泰姆

1.)Adjustable Output Voltage from +0.6V to +3.3V4Nr嘉泰姆
    - 0.6V Reference Voltage4Nr嘉泰姆
    - ±1% Accuracy Over Temperature4Nr嘉泰姆
2.)Operates from an Input Battery Voltage Range of +3V to +25V4Nr嘉泰姆
3.)Wide Output Load Range from 0A to 25A4Nr嘉泰姆
4.)Power-On-Reset Monitoring on VCC Pin4Nr嘉泰姆
5.)Excellent Line and Load Transient Response4Nr嘉泰姆
6.)PFM Mode for Increased Light Load Efficiency4Nr嘉泰姆
7.)Programmable PWM Frequency from 200kHz to 600kHz4Nr嘉泰姆
8.)Integrated MOSFET Drivers and Bootstrap Diode4Nr嘉泰姆
9.)Internal Integrated Soft-Start and Soft-Stop4Nr嘉泰姆
10.)Selectable Forced PWM or Automatic PFM/PWM4Nr嘉泰姆
11.)Mode (only for QFN4x4-16A and TQFN3x3-16 Packages)4Nr嘉泰姆
      Power Good Monitoring4Nr嘉泰姆
12.)Fault Identification by PGOOD Pull-Down Resistance4Nr嘉泰姆
13.)70% Under-Voltage Protection (UVP)4Nr嘉泰姆
14.)124% Over-Voltage Protection (OVP)4Nr嘉泰姆
15.)Adjustable Over-Current Protection (OCP)4Nr嘉泰姆
      - Sensing Low-Side MOSFET’s Current4Nr嘉泰姆
16.)Over-Temperature Protection (OTP)4Nr嘉泰姆
17.)SSOP-16, Compact 4mmx4mm QFN-16 (QFN4x4-4Nr嘉泰姆
     16A), and TQFN3x3-16 Packages4Nr嘉泰姆
18.)Lead Free and Green Devices Available4Nr嘉泰姆
三,应用范围 (Applications)4Nr嘉泰姆

PCI Express Graphical Processing Unit4Nr嘉泰姆
Notebook Adapter4Nr嘉泰姆
Auxiliary Power Rail4Nr嘉泰姆
VRM4Nr嘉泰姆
四.下载产品资料PDF文档 4Nr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！4Nr嘉泰姆

 4Nr嘉泰姆

五,产品封装图 (Package)4Nr嘉泰姆

4Nr嘉泰姆

六.电路原理图4Nr嘉泰姆

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七,功能概述4Nr嘉泰姆

Power Good Indicator4Nr嘉泰姆
The CXSD6292 features an open-drain PGOOD output pin to indicate one of the IC’s working statuses 4Nr嘉泰姆

including soft-start, under-voltage fault, over-current fault, and over-voltage faule. The unique fault-4Nr嘉泰姆

identification capability can drastically reduce trouble-shooting time and effort.4Nr嘉泰姆
The pull-down resistance of the PGOOD pin correspondsto the fault status of the controller. During 4Nr嘉泰姆

soft-start or if an under voltage fault occurs, the PGOOD pull-down re-sistance is 95Ω, or 32Ω for 4Nr嘉泰姆

an over current fault, or 63Ω for an over voltage fault. The pull-low resistance is unde-fined if VCC 4Nr嘉泰姆

is below the rising/falling POR threshold.4Nr嘉泰姆
Over-Temperature Protection (OTP)4Nr嘉泰姆
When the junction temperature increases above the ris-ing threshold temperature TOTR, the IC 4Nr嘉泰姆

will enter the over-temperature protection (OTP) state that suspends the PWM, which forces the 4Nr嘉泰姆

LG and UG gate drivers to output low voltages. The status of the PGOOD pin does not change, nor4Nr嘉泰姆

 does the converter latch-off. The thermal sensor allows the converters to start a start-up process 4Nr嘉泰姆

and regulate the output voltage again after the junction temperature cools by 25oC. The OTP is 4Nr嘉泰姆

designed with a 25oC hysteresis to lower the average TJ during continu-ous thermal overload 4Nr嘉泰姆

conditions, which increases life- time of the CXSD6292.4Nr嘉泰姆

Over-Current Protection (OCP) and Short-Circuit Pro-tection (SCP)4Nr嘉泰姆
The over-current protection (OCP) is designed to resist the slow slew rate load current; on the other4Nr嘉泰姆

 hand, the short-circuit protection (SCP) is used to take care of rapid shorted output. The setpoint for4Nr嘉泰姆

 OCP and SCP is pro-grammed with resistor RSEN that is connected across the ISEN pin and drain of4Nr嘉泰姆

 the low-side MOSFET. The SCP setpoint is internally set to twice the OCP setpoint.4Nr嘉泰姆
The inductor current develops a negative voltage across the RDS(ON) of the low-side MOSFET that is4Nr嘉泰姆

 sampled and held shortly before LG gate-driver output goes low. The OCP fault occurs if ISEN rises 4Nr嘉泰姆

above the OCP threshold current IOC (typical :26μA) while attempting to null the nega-tive voltage 4Nr嘉泰姆

across the PHASE and GND pins. When the ISEN exceeds IOC, the OCP counter starts to work.4Nr嘉泰姆
Meanwhile, pulses on all the PWM (ISEN > IOC) remains for 20μs, the OCP will be triggered. When 4Nr嘉泰姆

ISEN falls below IOC on a PWM pulses before 20μs has elapsed, the counter will be reset. The SCP4Nr嘉泰姆

 fault will occur within 10μs when I SEN exceeds twice I OC. The relationship between the sampled 4Nr嘉泰姆

current and MOSFET current is given by:4Nr嘉泰姆
ISEN × RSEN = RDS ( ON ) × IL4Nr嘉泰姆
Which means the current sensing pin will source current to make the voltage drop on the MOSFET 4Nr嘉泰姆

and is equal to the voltage generated on the sensing resistor along the ISEN pin current flowing path.4Nr嘉泰姆
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