UC3825

現行

增強型 30V、1.5A 雙端 PWM 控制器，具有 9.2V/8.4V UVLO 和 85% 工作週期，0C 至 70C

立即訂購

產品規格表

document-pdfAcrobat High Speed PWM Controller datasheet (Rev. A) (英文)

UC3825

現行

產品規格表

立即訂購

產品詳細資料

Vin (max) (V)

12

Operating temperature range (°C)

0 to 70

Control mode

Current, Feedforward, Voltage

Topology

Boost, Flyback, Forward, Half bridge, Push pull

Rating

Catalog

Features

Adjustable switching frequency, Current limiting, Error amplifier, Multi-topology, Programmable max duty cycle, Soft start, Synchronization pin

Duty cycle (max) (%)

85

Vin (max) (V)

12

Operating temperature range (°C)

0 to 70

Control mode

Current, Feedforward, Voltage

Topology

Boost, Flyback, Forward, Half bridge, Push pull

Rating

Catalog

Features

Adjustable switching frequency, Current limiting, Error amplifier, Multi-topology, Programmable max duty cycle, Soft start, Synchronization pin

Duty cycle (max) (%)

85

PDIP (N)

16

181.42 mm² 19.3 x 9.4

SOIC (DW)

16

106.09 mm² 10.3 x 10.3

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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	類型	標題	日期
*	Data sheet	High Speed PWM Controller datasheet (Rev. A)	2004年 2月 24日
	Selection guide	Power Management Guide 2018 (Rev. R)	2018年 6月 25日
	Application note	Current Doubler Rectifier Offers Ripple Current Cancellation	2004年 9月 21日
	Application note	U-110 1.5 Mhz Current Mode IC Controlled 50-Watt Power Supply	1999年 9月 5日