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UC284XBD Fiches technique(PDF) 1 Page - ON Semiconductor |
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UC284XBD Fiches technique(HTML) 1 Page - ON Semiconductor |
1 / 20 page © Semiconductor Components Industries, LLC, 2001 December, 2001 – Rev. 3 1 Publication Order Number: UC3842B/D UC3842B, UC3843B, UC2842B, UC2843B, NCV3843BV High Performance Current Mode Controllers The UC3842B, UC3843B series are high performance fixed frequency current mode controllers. They are specifically designed for Off–Line and dc–to–dc converter applications offering the designer a cost–effective solution with minimal external components. These integrated circuits feature a trimmed oscillator for precise duty cycle control, a temperature compensated reference, high gain error amplifier, current sensing comparator, and a high current totem pole output ideally suited for driving a power MOSFET. Also included are protective features consisting of input and reference undervoltage lockouts each with hysteresis, cycle–by–cycle current limiting, programmable output deadtime, and a latch for single pulse metering. These devices are available in an 8–pin dual–in–line and surface mount (SO–8) plastic package as well as the 14–pin plastic surface mount (SO–14). The SO–14 package has separate power and ground pins for the totem pole output stage. The UCX842B has UVLO thresholds of 16 V (on) and 10 V (off), ideally suited for off–line converters. The UCX843B is tailored for lower voltage applications having UVLO thresholds of 8.5 V (on) and 7.6 V (off). • Trimmed Oscillator for Precise Frequency Control • Oscillator Frequency Guaranteed at 250 kHz • Current Mode Operation to 500 kHz • Automatic Feed Forward Compensation • Latching PWM for Cycle–By–Cycle Current Limiting • Internally Trimmed Reference with Undervoltage Lockout • High Current Totem Pole Output • Undervoltage Lockout with Hysteresis • Low Startup and Operating Current Figure 1. Simplified Block Diagram 5.0V Reference Latching PWM VCC Undervoltage Lockout Oscillator Error Amplifier 7(12) VC 7(11) Output 6(10) Power Ground 5(8) 3(5) Current Sense Input Vref 8(14) 4(7) 2(3) 1(1) Gnd 5(9) RT/CT Voltage Feedback Input R R + - Vref Undervoltage Lockout Output Compensation Pin numbers in parenthesis are for the D suffix SO-14 package. VCC http://onsemi.com 14 SO–14 D SUFFIX CASE 751A 1 See detailed ordering and shipping information in the package dimensions section on page 16 of this data sheet. ORDERING INFORMATION See general marking information in the device marking section on page 17 of this data sheet. DEVICE MARKING INFORMATION 1 8 PDIP–8 N SUFFIX CASE 626 PIN CONNECTIONS Compensation NC Voltage Feedback NC Current Sense NC RT/CT Compensation Voltage Feedback Current Sense RT/CT Vref Vref NC VCC VC Output Gnd Power Ground VCC Output Gnd (Top View) 8 7 6 5 1 2 3 4 1 2 3 4 14 13 12 11 5 6 7 10 9 8 (Top View) SO–8 D1 SUFFIX CASE 751 1 8 |
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