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AC/DC 控制器

UC2825

不推薦在新設計中採用

強化型 30V、1.5A 雙端 1MHz PWM 控制器，具有 9.2V/8.4V UVLO、80% 工作週期、-40C 至 85C

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產品規格表
UC2825 不建議用於新設計
此產品將繼續向現有客戶提供。新設計應考量替代產品。
open-in-new 比較替代產品
功能相似於所比較的產品。
TL494 現行 40V、0.2A 300KHz PWM 控制器 Supports push-pull topology

UC2825

不推薦在新設計中採用
產品規格表 立即訂購

產品詳細資料

Topology Boost, Flyback, Forward, Full bridge, Half bridge, Push pull Control mode Current, Feedforward Features Adjustable switching frequency, Current limiting, Error amplifier, Multi-topology, Programmable max duty cycle, Soft start, Synchronization pin Duty cycle (max) (%) 80
Topology Boost, Flyback, Forward, Full bridge, Half bridge, Push pull Control mode Current, Feedforward Features Adjustable switching frequency, Current limiting, Error amplifier, Multi-topology, Programmable max duty cycle, Soft start, Synchronization pin Duty cycle (max) (%) 80
PDIP (N) 16 181.42 mm² (19.3 mm × 9.4 mm) SOIC (DW) 16 106.09 mm² (10.3 mm × 10.3 mm)
  • Compatible with Voltage or Current Mode Topologies
  • Practical Operation Switching Frequencies to 1MHz
  • 50ns Propagation Delay to Output
  • High Current Dual Totem Pole Outputs (1.5A Peak)
  • Wide Bandwidth Error Amplifier
  • Fully Latched Logic with Double Pulse Suppression
  • Pulse-by-Pulse Current Limiting
  • Soft Start / Max. Duty Cycle Control
  • Under-Voltage Lockout with Hysteresis
  • Low Start Up Current (1.1mA)
  • Compatible with Voltage or Current Mode Topologies
  • Practical Operation Switching Frequencies to 1MHz
  • 50ns Propagation Delay to Output
  • High Current Dual Totem Pole Outputs (1.5A Peak)
  • Wide Bandwidth Error Amplifier
  • Fully Latched Logic with Double Pulse Suppression
  • Pulse-by-Pulse Current Limiting
  • Soft Start / Max. Duty Cycle Control
  • Under-Voltage Lockout with Hysteresis
  • Low Start Up Current (1.1mA)

The UC1825 family of PWM control ICs is optimized for high frequency switched mode power supply applications. Particular care was given to minimizing propagation delays through the comparators and logic circuitry while maximizing bandwidth and slew rate of the error amplifier. This controller is designed for use in either current-mode or voltage mode systems with the capability for input voltage feed-forward.

Protection circuitry includes a current limit comparator with a 1V threshold, a TTL compatible shutdown port, and a soft start pin which will double as a maximum duty cycle clamp. The logic is fully latched to provide jitter free operation and prohibit multiple pulses at an output. An under-voltage lockout section with 800mV of hysteresis assures low start up current. During under-voltage lockout, the outputs are high impedance.

These devices feature totem pole outputs designed to source and sink high peak currents from capacitive loads, such as the gate of a power MOSFET. The on state is designed as a high level.

The UC1825 family of PWM control ICs is optimized for high frequency switched mode power supply applications. Particular care was given to minimizing propagation delays through the comparators and logic circuitry while maximizing bandwidth and slew rate of the error amplifier. This controller is designed for use in either current-mode or voltage mode systems with the capability for input voltage feed-forward.

Protection circuitry includes a current limit comparator with a 1V threshold, a TTL compatible shutdown port, and a soft start pin which will double as a maximum duty cycle clamp. The logic is fully latched to provide jitter free operation and prohibit multiple pulses at an output. An under-voltage lockout section with 800mV of hysteresis assures low start up current. During under-voltage lockout, the outputs are high impedance.

These devices feature totem pole outputs designed to source and sink high peak currents from capacitive loads, such as the gate of a power MOSFET. The on state is designed as a high level.
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重要文件 類型 標題 格式選項 下載最新的英文版本 日期
* 資料表 High Speed PWM Controller datasheet (Rev. A) 2004/2/24

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