UC2845B

UMW
UMW R UMW UC2842/43/44/45 Description The 2842/43/44/45 are fixed frequency current mode PWM controller. They are specially designed for OFF−Line and DC to DC converter applications with a minimal external components. Internally implemented circuits include a trimmed oscillator for precise duty cycle control, a temperature compensated reference, high gain error amplifier, current sensing com...
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Технические характеристики

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Корпус SOP-8
Входное напряжение
Максимальный выходной ток
Кол-во выходов
Частота преобразования
Рабочая температура
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Аналоги 1

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Тип Наименование Корпус Упаковка i Тип Режим Uвх Uвых Iвых Выходов F преобр Iпотр nmax Опции Примечание T раб Карточка
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Файлы 1

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UMW R UMW UC2842/43/44/45 Description The 2842/43/44/45 are fixed frequency current mode PWM controller. They are specially designed for OFF−Line and DC to DC converter applications with a minimal external components. Internally implemented circuits include a trimmed oscillator for precise duty cycle control, a temperature compensated reference, high gain error amplifier, current sensing comparator, and a high current totempole output ideally suited for driving a power MOSFET. Protection circuitry includes built undervoltage lockout and current limiting. The 2842 and 2844 have UVLO thresholds of 16V (on) and 10V (off). The corresponding thresholds for the 2843/ 45 are 8.4V (on) and 7.6V (off). The 2842 and 2843 can operate within 100% duty cycle. The 2844 and 2845 can operate within 50% duty cycle. The 284X has Start-Up Current 0.5mA (typ). Pin Connection Features • • • • Low Start-Up and Operating Current High Current Totem Pole Output Undervoltage Lockout With Hysteresis Operating Frequency Up To 500KHz Top view Block diagram (toggle flip flop used only in 2844, 2845) V R T Absolute Maximum Ratings Symbol VCC Parameter Maximum Units Supply Voltage (low impedance source) 30 V IO Output Current ±1 A VI Input Voltage (Analog Inputs pins 2,3) −0.3 to 5.5 V Error Amp Output Sink Current Power Dissipation (TA=250C) Storage Temperature Range 10 1 -65 to150 mA W o C ISINK (E.A) Po Tstg TL TA Lead Temperature (soldering 5 sec.) Operating Ambient Temperature www.umw-ic.com 1 260 o -25 to +85 o C C 友台半导体有限公司 PDF
Документация на UC2845B 

UMW UC284X

Дата модификации: 24.09.2023

Размер: 875.1 Кб

9 стр.

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