LM5041B中文资料具有参考引脚禁用选项的级联 PWM 控制器数据手册TI规格书

描述 Description

The LM5041B PWM controller contains all of the features necessary to implement either current-fed or voltage-fed push-pull or bridge power converters. These “Cascaded” topologies are well suited for multiple output and higher power applications. The LM5041B includes these four control outputs: the buck stage controls (HD and LD) and the push-pull control outputs (PUSH and PULL). Push-pull outputs are driven at 50% nominal duty cycle at one half of the switching frequency of the buck stage and can be configured for either a guaranteed overlap time (for current-fed applications) or a guaranteed non-overlap time (for voltage-fed applications). Push-pull stage MOSFETs can be driven directly from the internal gate drivers while the buck stage requires an external driver such as the LM5102. The LM5041B includes a high-voltage start-up regulator that operates over a wide input range of 15V to 100V. The PWM controller is designed for high-speed capability including an oscillator frequency range up to 1 MHz and total propagation delays of less than 100 ns. Additional features include line Under-Voltage Lock-Out (UVLO), Soft-Start, an error amplifier, precision voltage reference, and thermal shutdown.

特性 Features

• Internal Start-up Bias Regulator
• Programmable Line Under-Voltage Lockout (UVLO) with Adjustable Hysteresis
• Current Mode Control
• Internal Error Amplifier with Reference
• Cycle-by-cycle Over-Current Protection
• Leading Edge Blanking
• Programmable Push-Pull Overlap or Dead Time
• Internal 1.5A Push-Pull Gate Drivers
• Programmable Soft-Start
• Programmable Oscillator with Sync Capability
• Precision Reference
• Thermal Shutdown