Datasheet > UC2825AMDWREPG4

UC2825AMDWREPG4

更新时间： 2024-11-04 12:47:15

品牌	Logo	应用领域
德州仪器 - TI		控制器
页数	文件大小	规格书
21页	603K
描述
HIGH-SPEED PWM CONTROLLER

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UC2825AMDWREPG4 数据手册

UC2825A-EP

www.ti.com

SGLS305D –JULY 2005–REVISED SEPTEMBER 2010

HIGH-SPEED PWM CONTROLLER

Check for Samples: UC2825A-EP

FEATURES

•

Improved Version of the UC2825 PWM

SUPPORTS DEFENSE, AEROSPACE,

AND MEDICAL APPLICATIONS

•

Compatible With Voltage-Mode or

Current-Mode Control Methods

•

Controlled Baseline

One Assembly/Test Site

One Fabrication Site

Available in Military (–55°C/125°C)

Temperature Range⁽¹⁾

•

Practical Operation at Switching Frequencies

to 1 MHz

•

50-ns Propagation Delay to Output

High-Current Dual Totem-Pole Outputs

(2-A Peak)

•

Extended Product Life Cycle

Extended Product-Change Notification

Product Traceability

•

Trimmed Oscillator Discharge Current

Low 100-mA Startup Current

Pulse-by-Pulse Current-Limiting Comparator

Latched Overcurrent Comparator With Full

Cycle Restart

(1) Additional temperature ranges are available - contact factory

DESCRIPTION/ORDERING INFORMATION

The UC2825A-EP pulse width modulation (PWM) controller is an improved version of the standard UC2825.

Performance enhancements have been made to several of the circuit blocks. Error amplifier gain bandwidth

product is 12 MHz, while input offset voltage is 2 mV. Current-limit threshold is specified to a tolerance of 5%.

Oscillator discharge current is specified at 10 mA for accurate dead-time control. Frequency accuracy is

improved to 6%. Startup supply current, typically 100 mA, is ideal for off-line applications. The output drivers are

redesigned to actively sink current during undervoltage lockout (UVLO) at no expense to the startup current

specification. In addition, each output is capable of 2-A peak currents during transitions.

Functional improvements also have been implemented in this family. The UC2825A-EP shutdown comparator is

now a high-speed overcurrent comparator with a threshold of 1.2 V. The overcurrent comparator sets a latch that

ensures full discharge of the soft-start capacitor before allowing a restart. While the fault latch is set, the outputs

are in the low state. In the event of continuous faults, the soft-start capacitor is fully charged before discharge to

ensure that the fault frequency does not exceed the designed soft-start period. The UC2825 CLOCK pin is

CLK/LEB in the UC2825A-EP. This pin combines the functions of clock output and leading-edge blanking

adjustment and has been buffered for easier interfacing.

The UC2825A-EP has dual alternating outputs and the same pin configuration as UC2825. UVLO thresholds are

identical to the original UC2825.

Consult the application report, The UC3823A,B and UC2825A,B Enhanced Generation of PWM Controllers,

literature number SLUA125, for detailed technical and applications information.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

12 3 4 5 6 7...21

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UC2825AMDWREPG4 替代型号

型号	品牌	替代类型	描述	数据表
V62/05616-02XE	TI	类似代替	HIGH-SPEED PWM CONTROLLER
UC2825AMDWREP	TI	类似代替	HIGH-SPEED PWM CONTROLLER

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