LM5025B：TI主动钳位电压模式PWM控制器
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更新于2024-06-30
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"TI-LM5025B是一款由德州仪器(TI)推出的主动钳位电压模式脉宽调制(PWM)控制器。该控制器在功能上与LM5025相似，但在某些特性上有所差异，适用于电源管理领域，尤其在高电压、大电流的应用场景中。
LM5025B的主要特点包括：
1. **内部启动偏置稳压器**：内置的启动偏置稳压器使得芯片能够自启动，无需外部元件。
2. **复合主门极驱动器**：提供强大的驱动能力，可以控制主功率MOSFET。
3. **可编程线路欠压锁定保护（UVLO）**：具有可调整的滞后，当输入电压低于设定阈值时，能防止控制器误动作。
4. **最大PWM占空比限制在75%以下**：降低对功率MOSFET的电压应力，确保电路稳定。
5. **电压模式控制带前馈**：提高了控制精度，能快速响应负载变化。
6. **可调节双模式过流保护**：提供灵活的电流保护机制，适应不同应用需求。
7. **CS2hiccup模式阈值提升至0.5V**：过载情况下，增加保护机制的灵敏度。
8. **CS2滤波器放电设备被禁用**：优化了电流检测电路的工作状态。
9. **VCC稳压器在线路欠压锁定时仍能工作**：即使在低电压环境下也能保持基本功能。
10. **可编程重叠或死区时间**：控制主输出和主动钳位输出之间的同步，防止开关冲突。
11. **电压x秒最大占空比钳位**：防止长时间的高占空比导致的过热问题。
12. **可编程软启动**：平滑启动过程，避免电流冲击。
13. **电流感应前沿消隐**：减少噪声干扰，提高电流测量的准确性。
14. **VREF稳压器在输入线路UVLO低于工作阈值时关闭**：节省功耗，提高效率。
15. **单电阻编程**：简化外部元件配置，降低设计复杂性。
这款控制器旨在提供高效、可靠的电源转换解决方案，适用于工业、通信、服务器和电动汽车等领域。通过其丰富的保护特性和可编程性，设计者可以根据具体应用需求进行定制，确保系统安全稳定运行。"
LM5025B
www.ti.com
SNVS354B –JULY 2005–REVISED MARCH 2013
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
Absolute Maximum Ratings
(1)(2)
V
IN
to GND -0.3V to 105V
V
CC
to GND -0.3V to 16V
CS1, CS2 to GND -0.3 to 1.00V
All other inputs to GND -0.3 to 7V
ESD Rating
(3)
Human Body Model 2kV
Storage Temperature Range -55°C to 150°C
Junction Temperature 150°C
(1) Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which
operation of the device is intended to be functional. For specifications and test conditions, see the Electrical Characteristics.
(2) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/ Distributors for availability and
specifications.
(3) For detailed information on soldering plastic TSSOP and WSON packages, refer to the Packaging Data Book visit
www.ti.com/packaging.
Operating Ratings
(1)
V
IN
Voltage 13 to 100V
External Voltage Applied to V
CC
8 to 15V
Operating Junction Temperature -40°C to +125°C
(1) Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which
operation of the device is intended to be functional. For specifications and test conditions, see the Electrical Characteristics.
Electrical Characteristics
(1)
Specifications with standard typeface are for T
J
= 25°C, and those with boldface type apply over full Operating Junction
Temperature range. V
IN
= 48V, V
CC
= 10V, RT = 26.7kΩ, R
SET
= 27.4kΩ) unless otherwise stated
Symbol Parameter Conditions Min Typ Max Units
Startup Regulator
V
CC
Reg V
CC
Regulation No Load 7.3 7.6 7.9 V
V
CC
Current Limit
(2)
20 25 mA
I-V
IN
Startup Regulator V
IN
= 100V 165 500 µA
Leakage (external Vcc
Supply)
V
CC
Supply
V
CC
Under-voltage V
CC
Reg - V
CC
Reg - V
Lockout Voltage (positive 220mV 120mV
going V
cc
)
V
CC
Under-voltage 1.0 1.5 2.0 V
Hysteresis
V
CC
Supply Current (I
CC
) C
gate
= 0 4.2 mA
Reference Supply
V
REF
Ref Voltage I
REF
= 0 mA 4.85 5 5.15 V
Ref Voltage Regulation I
REF
= 0 to 10mA 25 50 mV
Ref Current Limit 10 20 mA
(1) All electrical characteristics having room temperature limits are tested during production with T
A
= T
J
= 25°C. All hot and cold limits are
specified by correlating the electrical characteristics to process and temperature variations and applying statistical process control.
(2) Device thermal limitations may limit usable range.
Copyright © 2005–2013, Texas Instruments Incorporated Submit Documentation Feedback 5
Product Folder Links: LM5025B
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