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UC3842A データシート(PDF) 4 Page - Microsemi Corporation |
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UC3842A データシート(HTML) 4 Page - Microsemi Corporation |
4 / 8 page C URRENT M ODE PWM C ONTROLLER UC184xA/284xA/384xA PRODUCT DA T ABOOK 1996/1997 Copyright © 1995 Rev. 1.2 12/95 4 P RODUCTION D ATA S HEET ELECTRICAL CHARACTERISTICS (Con't.) Under-Voltage Lockout Section Parameter Symbol Test Conditions Start Threshold x842A/4A x843A/5A Min. Operation Voltage After Turn-On x842A/4A x843A/5A UC384xA Units Min. Typ. Max. Min. Typ. Max. UC184xA/284xA 15 16 17 14.5 16 17.5 V 7.8 8.4 9.0 7.8 8.4 9.0 V 9 10 11 8.5 10 11.5 V 7.0 7.6 8.2 7.0 7.6 8.2 V PWM Section Maximum Duty Cycle x842A/3A x844A/5A Minimum Duty Cycle 94 96 100 94 96 100 % 47 48 50 47 48 50 % 00 % Total Standby Section Start-Up Current Operating Supply Current I CC Zener Voltage V Z I CC = 25mA 0.3 0.5 0.3 0.5 mA 11 17 11 17 mA 30 35 30 35 V BLOCK DIAGRAM * - VCC and VC are internally connected for 8 pin packages. ** - POWER GROUND and GROUND are internally connected for 8 pin packages. *** - Toggle flip flop used only in x844A and x845A series. Notes: 2. These parameters, although guaranteed, are not 100% tested in production. 3. Parameter measured at trip point of latch with V VFB = 0. 4. Gain defined as: A VOL = ; 0 ≤ V ISENSE ≤ 0.8V. 5. Adjust V CC above the start threshold before setting at 15V. 6. Output frequency equals oscillator frequency for the UC1842A and UC1843A. Output frequency is one half oscillator frequency for the UC1844A and UC1845A. 7. "Temperature stability, sometimes referred to as average temperature coefficient, is described by the equation: Temp Stability = V REF (max.) & V REF (min.) are the maximum & minimum reference voltage measured over the appropriate temperature range. Note that the extremes in voltage do not necessarily occur at the extremes in temperature." V REF (max.) - V REF (min.) T J (max.) - T J (min.) ∆ V COMP ∆ V ISENSE UVLO S / R 5V Ref Internal Bias 34V Error Amp 1V Current Sense Comparator PWM Latch S R R Oscillator 2R ** T *** V REF Good Logic 2.5V UVLO 16V (1842A/4A) 8.4V (1843A/5A) Hysteresis 6V (1842A/4A) 0.8V (1843A/5A) COMP CURRENT SENSE V FB R T/CT GROUND * V CC V REF 5.0V 50mA V C * OUTPUT POWER GROUND** |
同様の部品番号 - UC3842A |
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同様の説明 - UC3842A |
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