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UC3844DG Datasheet(PDF) 3 Page - ON Semiconductor |
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UC3844DG Datasheet(HTML) 3 Page - ON Semiconductor |
3 / 16 page UC3844, UC3845, UC2844, UC2845 http://onsemi.com 3 ELECTRICAL CHARACTERISTICS (VCC = 15 V, (Note 4), RT = 10 k, CT = 3.3 nF, TA = Tlow to Thigh (Note 5), unless otherwise noted.) UC284X UC384X Characteristics Symbol Min Typ Max Min Typ Max Unit ERROR AMPLIFIER SECTION (continued) 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) VOH VOL 5.0 − 6.2 0.8 − 1.1 5.0 − 6.2 0.8 − 1.1 V CURRENT SENSE SECTION Current Sense Input Voltage Gain (Notes 6 & 7) AV 2.85 3.0 3.15 2.85 3.0 3.15 V/V Maximum Current Sense Input Threshold (Note 6) Vth 0.9 1.0 1.1 0.9 1.0 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) High State (ISink = 20 mA) (ISink = 200 mA) VOL VOH − − 12 12 0.1 1.6 13.5 13.4 0.4 2.2 − − − − 13 12 0.1 1.6 13.5 13.4 0.4 2.2 − − 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 UCX844 UCX845 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 UCX844 UCX845 VCC(min) 9.0 7.0 10 7.6 11 8.2 8.5 7.0 10 7.6 11.5 8.2 V PWM SECTION Duty Cycle Maximum Minimum DCmax DCmin 46 − 48 − 50 0 47 − 48 − 50 0 % TOTAL DEVICE Power Supply Current (Note 4) Startup: (VCC = 6.5 V for UCX845A, (VCC 14 V for UCX844) Operating ICC − − 0.5 12 1.0 17 − − 0.5 12 1.0 17 mA Power Supply Zener Voltage (ICC = 25 mA) VZ 30 36 − 30 36 − 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 UC3844, UC3845 Thigh = +70°C for UC3844, UC3845 −25°C for UC2844, UC2845 +85°C for UC2844, UC2845 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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