Datasheet > UC281QTR

UC281QTR

更新时间： 2024-11-24 23:38:55

品牌	Logo	应用领域
其他 - ETC		模拟IC
页数	文件大小	规格书
9页	506K
描述
Analog IC

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中文翻译

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数据手册

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UC281QTR 数据手册

UC1861-1868

UC2861-2868

UC3861-3868

Resonant-Mode Power Supply Controllers

FEATURES

DESCRIPTION

• Controls Zero Current Switched (ZCS) The UC1861-1868 family of ICs is optimized for the control of Zero Cur-

or Zero Voltage Switched (ZVS)

Quasi-Resonant Converters

rent Switched and Zero Voltage Switched quasi-resonant converters. Dif-

ferences between members of this device family result from the various

combinations of UVLO thresholds and output options. Additionally, the

one-shot pulse steering logic is configured to program either on-time for

ZCS systems (UC1865-1868), or off-time for ZVS applications (UC1861-

1864).

• Zero-Crossing Terminated One-Shot

Timer

• Precision 1%, Soft-Started 5V

Reference

The primary control blocks implemented include an error amplifier to com-

pensate the overall system loop and to drive a voltage controlled oscillator

(VCO), featuring programmable minimum and maximum frequencies. Trig-

gered by the VCO, the one-shot generates pulses of a programmed maxi-

mum width, which can be modulated by the Zero Detection comparator.

This circuit facilitates “true” zero current or voltage switching over various

line, load, and temperature changes, and is also able to accommodate the

resonant components' initial tolerances.

• Programmable Restart Delay

Following Fault

• Voltage-Controlled Oscillator (VCO)

with Programmable Minimum and

Maximum Frequencies from 10kHz to

1MHz

• Low Start-Up Current (150µA typical)

• Dual 1 Amp Peak FET Drivers

Under-Voltage Lockout is incorporated to facilitate safe starts upon

power-up. The supply current during the under-voltage lockout period is

typically less than 150µA, and the outputs are actively forced to the low

• UVLO Option for Off-Line or DC/DC

Applications

state.

(continued)

Device

UVLO

1861

1862

1863

36014

1864

36014

1865

1866

1867

36014

1868

36014

16.5/10.5

Alternating

Off Time

16.5/10.5

Parallel

Off Time

16.5/10.5

Alternating

On Time

16.5/10.5

Parallel

On Time

Outputs

“Fixed”

Alternating

Off Time

Parallel

Off Time

Alternating

On Time

Parallel

On Time

BLOCK DIAGRAM

UDG-92018

Pin numbers refer to the J and N packages.

10/98

12 3 4 5 6 7...9

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