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IP3844A Datasheet(PDF) 2 Page - Seme LAB |
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IP3844A Datasheet(HTML) 2 Page - Seme LAB |
2 / 6 page LAB SEME IP1844A SERIES IP1845A SERIES Semelab plc. Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612. Prelim. 2/95 VCC Supply Voltage 1 IO Output Current Analog Inputs (pins 2 and 3) Error Amp Output Sink Current IP1844A , IP1845A Operating Ambient Temperature Range IP2844A , IP2845A IP3844A , IP3845A ≤ 30V 0 to ±200mA –0.3V to 3V 0 to 2mA –55 to 125°C –25 to 85°C 0 to 70°C Notes: 1. Lower limit set by under voltage lockout specification. RECOMMENDED OPERATING CONDITIONS * 1844A and 1845A series only. Values in brackets are for IP1845 series. 3.6V ERROR AMP OSCILLATOR 2R R 1V R S PW M LATCH CURRENT SENSE COM PARATOR 16V (8.4V) 6V (0.5V) 2.5V UNDER–VOLTAGE LOCKOUT ENABLE REFERENCE REGULATOR 5V INTERNAL BIAS 34V REG R S V STATUS LATCH REF PIN NUM BERS 1st Num ber 2nd Num ber – N, J and 8 Pin D Packages – 14 Pin D Package. COMP GND VCC I SENSE VFB /C R T T OUTPUT POW ER GROUND V REF V C 3/5 5/9 7/12 2/3 1/1 4/7 6/10 7/11 5/8 8/14 TOGGLE FLIP FLOP * T Q DESCRIPTION The IP1844A/IP1845A series of switching regulator control circuits contain all the functions necessary to implement off-line, current mode switching regulators, using a minimum number of external parts. Functions included are voltage reference, error amplifier, current sense comparator, oscillator, totem-pole output driver and under-voltage lockout circuitry. In addition the IP1844A and IP1845A series of devices have a toggle flip-flop which blanks the output on every second clock pulse, thereby ensuring that the duty cycle never exceeds 50%. For applications requiring more flexible control, all devices feature an on-chip trimmed oscillator discharge current, allowing accurate control to maximum-duty-cycle by selection of timing components. This can be beneficial even when using the IP1844A or IP1845A series, as it allows optimum safety margins to be designed into the application. Although pin compatible with the standard IP1844/5 parts these devices offer improved performance in several areas. They also offer tighter specification and improved performance over the IP and UC1844/5 series, whilst retaining complete compatibility. BLOCK DIAGRAM |
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