Datasheet > U1825J

U1825J

更新时间： 2024-11-10 21:53:43

品牌	Logo	应用领域
德州仪器 - TI		控制器
页数	文件大小	规格书
17页	912K
描述
High Speed PWM Controller

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U1825J 数据手册

application

INFO

UC1825

UC2825

UC3825

available

High Speed PWM Controller

FEATURES

DESCRIPTION

•

Compatible with Voltage or Current Mode The UC1825 family of PWM control ICs is optimized for high fre-

Topologies

quency 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 cur-

rent-mode or voltage mode systems with the capability for input volt-

age feed-forward.

•

Practical Operation Switching Frequencies

to 1MHz

•

50ns Propagation Delay to Output

High Current Dual Totem Pole Outputs

(1.5A Peak)

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 out-

puts are high impedance.

•

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)

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.

BLOCK DIAGRAM

UDG-92030-2

SLUS235A - MARCH 1997 - REVISED MARCH 2004

12 3 4 5 6 7...17

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