CXSD62397提供简单、单反馈回路、电压模式控制和快速瞬态响应。它包括一个300kHz自由运行的三角波振荡器。误差放大器采用15MHz增益带宽产品，为快速瞬态性能提供高转换带宽。由此产生的PWM占空比在0%到80%之间。参考电压为0.8V，精度为2%CXSD62397具有内部软启动，并在软启动间隔期间执行逐周电流限制。CXSD62397通过使用低端MOSFET的RDS（ON）来监测电流，从而消除了对电流感应电阻器的需要。欠压保护功能监控FB引脚的电压。软启动间隔后的过流和欠压事件触发了小电流模式保护
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产品概述 返回TOP
The CXSD62397 provides complete control and protection for a DC-DC converter for high power applications. It is designed to drive two N-channel MOSFETs in a synchronous-rectified buck topology. The CXSD62397 integrates all of the control, bootstrap diode and protection functions into a single package. The CXSD62397 provides simple, single feedback loop, voltage-mode control with fast transient response. It includes a 300kHz free-running triangle-wave oscillator. The error amplifier features a 15MHz gain-bandwidth product which provides high converter bandwidth for fast transient performance. The resulting PWM duty ratio ranges from 0% to 80%. The reference voltage is 0.8V, 2% accuracy. The CXSD62397 has internal soft start and executes cycle-by-cycle current limit during soft start interval. The CXSD62397 monitors the current by using the RDS(ON) of the low-side MOSFET which eliminates the need for a current sensing resistor. The under-voltage protection function monitors voltage at FB pin. The over-current and under-voltage events after soft-start interval trigger hiccup mode protection.
产品特点 返回TOP
„ Drives Two N-Channel MOSFETs
„ Operates at 5V to 24V Supply Voltage
„ Internal Bootstrap Diode Circuit
„ Voltage-Mode PWM Control
„ Fast Transient Response
„ 0.8V, 2% Accuracy Reference Voltage
„ Internal Soft Start
„ Constant 300kHz Switching Frequency
„ Over-Current Fault Monitors by Using Low-Side MOSFET RDS(ON)
„ Output Under-Voltage Protection
应用范围 返回TOP
„ 16V to 30V Input High Power DC-DC Regulators
„ Low-Voltage Distributed Power Supplies
技术规格书（产品PDF) 返回TOP
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产品封装图 返回TOP
电路原理图 返回TOP
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Synchronous Step Down Controller |
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|
Part NO. |
Vin(V) min |
Vin(V) max |
IOUT (A) |
FSW (kHz) |
FB (V) |
Duty max(%) |
VOUT (ms) |
Note |
Package |
|
2.5 |
5.5 |
-- |
300 |
1 |
100 |
15 |
EXT, VDD, GND, CE, FB, Voltage Mode |
SOT-23-5 |
|
|
5 |
12 |
OCSET |
300 |
0.8 |
-- |
14 |
BST, DH, GND, DL, VCC, FB, OC, LX |
SOP-8 |
|
|
-- |
24 |
OCSET |
300 |
0.8 |
-- |
8 |
BST, DH, GND, DL, VCC, FB, OC, LX |
SOP-8 |
|
|
10 |
28 |
-- |
400 |
0.8 |
80 |
3 |
VCC, DL, GND, DH, BST, LX, VIN, FB |
TSOT-23-8 |
|
|
5 |
23 |
OCSET |
400 |
0.8 |
80 |
8 |
DH, LX, DL, GND, FB, OC, VCC, BST |
SOP-8 |
|
|
4.5 |
27 |
RSENSE |
ADJ |
0.7 |
93 |
ADJ |
Asynchronous Voltage Mode Controller |
MSOP-10(FD) |
|
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