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SG3845DM Datasheet(PDF) 4 Page - Microsemi Corporation |
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SG3845DM Datasheet(HTML) 4 Page - Microsemi Corporation |
4 / 12 page C URRENT -M ODE PWM C ONTROLLER SG1844/SG1845 Series PRODUCT DA T ABOOK 1996/1997 Copyright © 2000 Rev. 1.4 4/00 4 P RODUCTION D ATA S HEET ELECTRICAL CHARACTERISTICS (Cont'd.) Under-Voltage Lockout Section Parameter Symbol Test Conditions Start Threshold 1844 1845 Min. Operation Voltage After Turn-On 1844 1845 PWM Section Maximum Duty Cycle Minimum Duty Cycle Power Consumption Section Start-Up Current Operating Supply Current V FB = VISENSE = 0V V CC Zener Voltage I CC = 25mA Notes: 4. These parameters, although guaranteed, are not 100% tested in production. 5. Parameter measured at trip point of latch with V VFB = 0. SG3844/45 Units Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. SG2844/45 15 16 17 15 16 17 14.5 16 17.5 V 7.8 8.4 9.0 7.8 8.4 9.0 7.8 8.4 9.0 V 9 10 11 9 10 11 8.5 10 11.5 V 7.0 7.6 8.3 7.0 7.6 8.2 7.0 7.6 8.2 V SG1844/45 46 48 50 46 48 50 46 48 50 % 00 0 % 0.5 1 0.5 1 0.5 1 mA 11 17 11 17 11 17 mA 34 34 34 V 6. Gain defined as: A = ; 0 ≤ V ISENSE ≤ 0.8V. 7. Adjust V CC above the start threshold before setting at 15V. 8. Output frequency equals one half of oscillator frequency. Output Low Level I SINK = 20mA I SINK = 200mA Output High Level I SOURCE = 20mA I SOURCE = 200mA Rise Time (Note 4) T J = 25°C, CL = 1nF Fall Time (Note 4) T J = 25°C, CL = 1nF Current Sense Section Gain (Notes 5 & 6) Maximum Input Signal (Note 5) V COMP = 5V Power Supply Rejection Ratio (Note 5) PSRR 12 ≤ V CC ≤ 25V Input Bias Current Delay to Output (Note 4) Output Section 2.85 3 3.15 2.85 3 3.15 2.85 3 3.15 V/V 0.9 1 1.1 0.9 1 1.1 0.9 1 1.1 V 70 70 70 dB -2 -10 -2 -10 -2 -10 µA 150 300 150 300 150 300 ns 0.1 0.4 0.1 0.4 0.1 0.4 V 1.5 2.2 1.5 2.2 1.5 2.2 V 13 13.5 13 13.5 13 13.5 V 12 13.5 12 13.5 12 13.5 V 50 150 50 150 50 150 ns 50 150 50 150 50 150 ns ∆ V COMP ∆ V ISENSE |
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