UC1856

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改进的电流模式 PWM 控制器

立即订购

数据表

document-pdfAcrobat Improved Current Mode PWM Controller 数据表 (Rev. A) (英语)

UC1856

正在供货

数据表

立即订购

产品详情

Rating

Military

Topology

Boost, Flyback, Forward, Full bridge, Half bridge, Push pull

Vin (max) (V)

40

Control mode

Current

Features

Error amplifier, Multi-topology, Soft start, Synchronization pin

Operating temperature range (°C)

-55 to 125

Duty cycle (max) (%)

50

Rating

Military

Topology

Boost, Flyback, Forward, Full bridge, Half bridge, Push pull

Vin (max) (V)

40

Control mode

Current

Features

Error amplifier, Multi-topology, Soft start, Synchronization pin

Operating temperature range (°C)

-55 to 125

Duty cycle (max) (%)

50

CDIP (J)

16

135.3552 mm² 19.56 x 6.92

LCCC (FK)

20

79.0321 mm² 8.89 x 8.89

Pin-for-Pin Compatible With the UC3846
65ns Typical Delay From Shutdown to Outputs, and 50ns Typical Delay From Sync to Outputs
Improved Current Sense Amplifier With Reduced Noise Sensitivity
Differential Current Sense with 3V Common Mode Range
Trimmed Oscillator Discharge Current for Accurate Deadband Control
Accurate 1V Shutdown Threshold
High Current Dual Totem Pole Outputs (1.5A peak)
TTL Compatible Oscillator SYNC Pin Thresholds
4kV ESD Protection

Pin-for-Pin Compatible With the UC3846
65ns Typical Delay From Shutdown to Outputs, and 50ns Typical Delay From Sync to Outputs
Improved Current Sense Amplifier With Reduced Noise Sensitivity
Differential Current Sense with 3V Common Mode Range
Trimmed Oscillator Discharge Current for Accurate Deadband Control
Accurate 1V Shutdown Threshold
High Current Dual Totem Pole Outputs (1.5A peak)
TTL Compatible Oscillator SYNC Pin Thresholds
4kV ESD Protection

The UC3856 is a high performance version of the popular UC3846 series of current mode controllers, and is intended for both design upgrades and new applications where speed and accuracy are important. All input to output delays have been minimized, and the current sense output is slew rate limited to reduce noise sensitivity. Fast 1.5A peak output stages have been added to allow rapid switching of power FETs.

A low impedance TTL compatible sync output has been implemented with a tri-state function when used as a sync input.

Internal chip grounding has been improved to minimize internal \x93noise\x94 caused when driving large capacitive loads. This, in conjunction with the improved differential current sense amplifier results in enhanced noise immunity.

Other features include a trimmed oscillator current (8%) for accurate frequency and dead time control; a 1V, 5% shutdown threshold; and 4kV minimum ESD protection on all pins.

The UC3856 is a high performance version of the popular UC3846 series of current mode controllers, and is intended for both design upgrades and new applications where speed and accuracy are important. All input to output delays have been minimized, and the current sense output is slew rate limited to reduce noise sensitivity. Fast 1.5A peak output stages have been added to allow rapid switching of power FETs.

A low impedance TTL compatible sync output has been implemented with a tri-state function when used as a sync input.

Internal chip grounding has been improved to minimize internal \x93noise\x94 caused when driving large capacitive loads. This, in conjunction with the improved differential current sense amplifier results in enhanced noise immunity.

Other features include a trimmed oscillator current (8%) for accurate frequency and dead time control; a 1V, 5% shutdown threshold; and 4kV minimum ESD protection on all pins.

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