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Hello visitor from
USA - 81 visiting from 80 USA 
1 Hong Kong
Hello visitor from
USA - 81 visiting from 80 USA 1 Hong Kong
Sell Uc3844b St Microelectronics Control Ic Dip
Posted at: Offers to Sell and Export | Posted on: Thursday 18 October 2012 6:35 am | Poster last visit: Friday 26 July 2013 |
Product Description:
Excellent Integrated System LIMITED (EIS LIMITED), Established in 1991, is a professional independent
stocking distributor of electronic components and specialize in buying the EXCESS STOCK from the original equipment manufacturers (OEMs), Contract equipment manufacturers (CEMs), and many other factories. EIS has gained good experiences in Excess Inventory Management through its development over 20 years and has become the reliable partner for the domestic and foreign OEM manufacturers. If any inquiry and question, please email us:
Part number uc3844b
BRAND ST Microelectronics
Packaging dip
Date code 10+
Price 0.2~0.21usd
Summary control IC, DIP, 1.25 W, – 0.3 to 5.5 V, ±1 A, UC3844B
Description as follow:
The UC3844B is a control IC. It provides the necessary features to implement off-line or DC to DC fixed frequency current mode control schemes with a minimal external parts count. Internally implemented circuits of the UC3844B include a trimmed oscillator for precise DUTY CYCLE CONTROL under voltage lock-out featuring start-up current less than 0.5mA, a precision reference trimmed for accuracy at the error amp input, logicto insure latched operation, a PWM comparator which also provides current limit control, and a totempole output stage designed to source or sink high peak current. The UC3844B output stage, suitable for driving N-Channel MOSFETs, is low in the off-state.
Parametrics
UC3844B absolute maximum ratings: (1)Vi, Supply Voltage (low impedance source): 30 V; (2)IO, Output Current ±1 A; (3)EO, Output Energy (capacitive load): 5 μJ; (4)Analog Inputs (pins 2, 3): – 0.3 to 5.5 V; (5)Error Amplifier Output Sink Current: 10 mA; (6)Ptot, Power Dissipation at Tamb ≤ 25℃ (Minidip): 1.25 W; (7)Ptot, Power Dissipation at Tamb ≤ 25℃ (SO8): 800 mW; (8)Tstg, Storage Temperature Range: – 65 to 150℃; (9)TJ, Junction Operating Temperature: – 40 to 150℃; (10)TL, Lead Temperature (soldering 10s): 300℃.
Features
UC3844B features: (1)trimmed oscillator for precise frequency control; (2)oscillator frequency guaranteed at 250kHz; (3)current mode operation to 500kHz; (4)automatic feed forward compensation; (5)latching PWM for cycle-by-cycle current limiting; (6)internally trimmed reference with under voltage lockout; (7)high current totem pole output; (8)undervoltage lockout with hysteresis; (9)low start-up and operating current.
Diagrams
Company Contact:
Contact Name: John
Company Name: Excellent Integrated System Limited (eis Limited)
Email:
Tel: 00852-30777742
Fax: 00852-30777843
Street Address: Rm 906, Workingberg
Comm Bldg, 41-47 Marble Rd, Hong Kong
Member name: EISLIMITED
Country: Hong Kong
Member Since: 29 August 2012
Total Leads: 537 EISLIMITED Import Export Business Leads
Business focus: Electronic Components, Active Component, Integrated Circuit, Semiconductor, Chips
Chat:
Verify: Safe Import Export Tips
stocking distributor of electronic components and specialize in buying the EXCESS STOCK from the original equipment manufacturers (OEMs), Contract equipment manufacturers (CEMs), and many other factories. EIS has gained good experiences in Excess Inventory Management through its development over 20 years and has become the reliable partner for the domestic and foreign OEM manufacturers. If any inquiry and question, please email us:
Part number uc3844b
BRAND ST Microelectronics
Packaging dip
Date code 10+
Price 0.2~0.21usd
Summary control IC, DIP, 1.25 W, – 0.3 to 5.5 V, ±1 A, UC3844B
Description as follow:
The UC3844B is a control IC. It provides the necessary features to implement off-line or DC to DC fixed frequency current mode control schemes with a minimal external parts count. Internally implemented circuits of the UC3844B include a trimmed oscillator for precise DUTY CYCLE CONTROL under voltage lock-out featuring start-up current less than 0.5mA, a precision reference trimmed for accuracy at the error amp input, logicto insure latched operation, a PWM comparator which also provides current limit control, and a totempole output stage designed to source or sink high peak current. The UC3844B output stage, suitable for driving N-Channel MOSFETs, is low in the off-state.
Parametrics
UC3844B absolute maximum ratings: (1)Vi, Supply Voltage (low impedance source): 30 V; (2)IO, Output Current ±1 A; (3)EO, Output Energy (capacitive load): 5 μJ; (4)Analog Inputs (pins 2, 3): – 0.3 to 5.5 V; (5)Error Amplifier Output Sink Current: 10 mA; (6)Ptot, Power Dissipation at Tamb ≤ 25℃ (Minidip): 1.25 W; (7)Ptot, Power Dissipation at Tamb ≤ 25℃ (SO8): 800 mW; (8)Tstg, Storage Temperature Range: – 65 to 150℃; (9)TJ, Junction Operating Temperature: – 40 to 150℃; (10)TL, Lead Temperature (soldering 10s): 300℃.
Features
UC3844B features: (1)trimmed oscillator for precise frequency control; (2)oscillator frequency guaranteed at 250kHz; (3)current mode operation to 500kHz; (4)automatic feed forward compensation; (5)latching PWM for cycle-by-cycle current limiting; (6)internally trimmed reference with under voltage lockout; (7)high current totem pole output; (8)undervoltage lockout with hysteresis; (9)low start-up and operating current.
Diagrams
Company Contact:
Contact Name: John
Company Name: Excellent Integrated System Limited (eis Limited)
Email:
Tel: 00852-30777742
Fax: 00852-30777843
Street Address: Rm 906, Workingberg
Comm Bldg, 41-47 Marble Rd, Hong Kong
Member name: EISLIMITED
Country:
Hong KongMember Since: 29 August 2012
Total Leads: 537 EISLIMITED Import Export Business Leads
Business focus: Electronic Components, Active Component, Integrated Circuit, Semiconductor, Chips
Chat:
Verify: Safe Import Export Tips
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