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IP1844A Datasheet(PDF) 5 Page - Seme LAB |
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IP1844A Datasheet(HTML) 5 Page - Seme LAB |
5 / 6 page For RT > 5kΩ, 1.8 Resultant frequency f ≈ (RTCT) .0063 RT – 2.3 .0063 – 4 ( ) tc ≈ 0.55 RTCT td ≈ RTCT Rn 1 Resultant frequency f = (tc + td) Oscillator timing capacitor CT is charged by VREF through RT and discharged by an internal current source. During the discharge time, the internal clock signal blanks the output to the low state. Selection of RT and CT therefore determines both oscillator frequency and maximum duty cycle. Charge and discharge times are determined by the formulae: LAB SEME IP1844A SERIES IP1845A SERIES Semelab plc. Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612. Prelim. 2/95 Open–Loop Laboratory Test Fixture APPLICATIONS INFORMATION High peak current associated with capacitive loads necessitate careful grounding techniques. Timing and bypass capacitors should be connected close to pin 5 in a single point ground. The transistor and 5K potentiometer are used to sample the oscillator wave form and apply an adjustable ramp to pin 3. 0.1 µF 1k Ω 1kW 1k Ω ERROR AMP ADJUST 4.7k Ω 5k Ω ADJUST 4.7k Ω 100k Ω 2N2222 I SENSE R T C T 0.1 µF VREF VCC OUTPUT GROUND 1 2 45 7 8 36 I SENSE VREF VCC O/P GND COMP VFB R T /C T Oscillator Waveforms and Maximum Duty Cycle 8 4 5 GND R T C T REF V R T C T PIN4 V (V for 14 pin D package) PIN7 INTERNAL CLOCK INTERNAL CLOCK OUTPUT – Max. Duty Cycle PIN6 V (V for 14 pin D package) PIN10 PIN4 V (V for 14 pin D package) PIN7 OUTPUT – Max. Duty Cycle PIN6 V (V for 14 pin D package) PIN10 LARGE C T SMALL R T LARGE R T SMALL C T |
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