Datasheet > UC1825Q

UC1825Q

更新时间： 2024-11-03 23:38:51

品牌	Logo	应用领域
其他 - ETC		模拟IC
页数	文件大小	规格书
8页	521K
描述
Analog IC

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中文翻译

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数据手册

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UC1825Q 数据手册

UC1825

UC2825

UC3825

High Speed PWM Controller

FEATURES

DESCRIPTION

•

Compatible with Voltage or Current Mode

Topologies

The UC1825 family of PWM control ICs is optimized for high fre-

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 current-

mode or voltage mode systems with the capability for input voltage

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 out-

put. An under-voltage lockout section with 800mV of hysteresis as-

sures low start up current. During under-voltage lockout, the outputs

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.

Trimmed Bandgap Reference (5.1V 1%)

BLOCK DIAGRAM

UDG-92030-2

3/97

12 3 4 5 6 7 8

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