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UC2845BG Datasheet(PDF) 4 Page - ON Semiconductor |
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UC2845BG Datasheet(HTML) 4 Page - ON Semiconductor |
4 / 20 page UC3844B, UC3845B, UC2844B, UC2845B http://onsemi.com 4 ELECTRICAL CHARACTERISTICS (VCC = 15 V [Note 4], RT = 10 k, CT = 3.3 nF. For typical values TA = 25°C, for min/max values TA is the operating ambient temperature range that applies [Note 5], unless otherwise noted.) UC284XB UC384XB, XBV Characteristic Symbol Min Typ Max Min Typ Max Unit ERROR AMPLIFIER SECTION Voltage Feedback Input (VO = 2.5 V) VFB 2.45 2.5 2.55 2.42 2.5 2.58 V Input Bias Current (VFB = 5.0 V) IIB − − 0.1 −1.0 − − 0.1 − 2.0 mA Open Loop Voltage Gain (VO = 2.0 V to 4.0 V) AVOL 65 90 − 65 90 − dB Unity Gain Bandwidth (TJ = 25°C) BW 0.7 1.0 − 0.7 1.0 − MHz Power Supply Rejection Ratio (VCC = 12 V to 25 V) PSRR 60 70 − 60 70 − dB Output Current Sink (VO = 1.1 V, VFB = 2.7 V) Source (VO = 5.0 V, VFB = 2.3 V) ISink ISource 2.0 − 0.5 12 −1.0 − − 2.0 − 0.5 12 −1.0 − − mA Output Voltage Swing High State (RL = 15 k to ground, VFB = 2.3 V) Low State (RL = 15 k to Vref, VFB = 2.7 V) (UC284XB, UC384XB) (UC384XBV) VOH VOL 5.0 − − 6.2 0.8 − − 1.1 − 5.0 − − 6.2 0.8 0.8 − 1.1 1.2 V CURRENT SENSE SECTION Current Sense Input Voltage Gain (Notes 6 & 7) (UC284XB, UC384XB) (UC384XBV) AV 2.85 − 3.0 − 3.15 − 2.85 2.85 3.0 3.0 3.15 3.25 V/V Maximum Current Sense Input Threshold (Note 6) (UC284XB, UC384XB) (UC384XBV) Vth 0.9 − 1.0 − 1.1 − 0.9 0.85 1.0 1.0 1.1 1.1 V Power Supply Rejection Ratio (VCC = 12 V to 25 V) (Note 6) PSRR − 70 − − 70 − dB Input Bias Current IIB − − 2.0 −10 − − 2.0 −10 mA Propagation Delay (Current Sense Input to Output) tPLH(In/Out) − 150 300 − 150 300 ns OUTPUT SECTION Output Voltage Low State (ISink = 20 mA) (ISink = 200 mA, UC284XB, UC384XB) (ISink = 200 mA, UC384XBV) High State (ISource = 20 mA, UC284XB, UC384XB) (ISource = 20 mA, UC384XBV) (ISource = 200 mA) VOL VOH − − − 13 − 12 0.1 1.6 − 13.5 − 13.4 0.4 2.2 − − − − − − − 13 12.9 12 0.1 1.6 1.6 13.5 − 13.4 0.4 2.2 2.3 − − − V Output Voltage with UVLO Activated (VCC = 6.0 V, ISink = 1.0 mA) VOL(UVLO) − 0.1 1.1 − 0.1 1.1 V Output Voltage Rise Time (CL = 1.0 nF, TJ = 25°C) tr − 50 150 − 50 150 ns Output Voltage Fall Time (CL = 1.0 nF, TJ = 25°C) tf − 50 150 − 50 150 ns UNDERVOLTAGE LOCKOUT SECTION Startup Threshold UCX844B, BV UCX845B, BV Vth 15 7.8 16 8.4 17 9.0 14.5 7.8 16 8.4 17.5 9.0 V Minimum Operating Voltage After Turn−On UCX844B, BV UCX845B, BV VCC(min) 9.0 7.0 10 7.6 11 8.2 8.5 7.0 10 7.6 11.5 8.2 V 4. Adjust VCC above the Startup threshold before setting to 15 V. 5. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible. Tlow =0°C for UC3844B, UC3845B Thigh =+ 70°C for UC3844B, UC3845B =− 25 °C for UC2844B, UC2845B = + 85 °C for UC2844B, UC2845B =− 40 °C for UC3844BV, UC3845BV = +105 °C for UC3844BV, UC3845BV 6. This parameter is measured at the latch trip point with VFB = 0 V. 7. Comparator gain is defined as: AV = DV Output/Compensation DV Current Sense Input |
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