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MC34845 Datasheet(PDF) 6 Page - Freescale Semiconductor, Inc |
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MC34845 Datasheet(HTML) 6 Page - Freescale Semiconductor, Inc |
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6 / 21 page  Analog Integrated Circuit Device Data 6 Freescale Semiconductor 34845 ELECTRICAL CHARACTERISTICS STATIC AND DYNAMIC ELECTRICAL CHARACTERISTICS BOOST (CONTINUED) Line Regulation VIN = 7.0 V to 21 V, ICH = 30 mA ILED/VIN -0.2 - 0.2 %/V Load Regulation VLED = 24 V to 40 V (all Channels), ICH = 30 mA ILED/VLED -0.2 - 0.2 %/V Minimum Duty Cycle DMIN - 10 15 % Maximum Duty Cycle DMAX 88 90 - % OVP Internally Fixed Value (no external voltage resistor divider) VOVP_INT 56 60 64 V OVP Programming Range(9) (set through an external resistor divider) VOVP_EXT 15 - 60 V OVP Reference Voltage VREF_OVP 6.3 6.9 7.5 V OVP Sink Current ISINK_OVP - 0.2 - μA Switching Frequency 34845 34845A 34845B fS 540 1080 270 600 1200 300 660 1320 330 kHz Soft Start Time (Fs=600 kHz, 100% PWM duty) tSS - 3.0 - ms Soft Start VOUT Overshoot (Fs=600 kHz, 100% PWM duty) SS_VOUT - - OVP V Boost Switch Rise Time BOOST_tR - 8.0 - ns Boost Switch Fall Time BOOST_tF - 6.0 - ns Current sense Amplifier Gain ACSA - 9.0 - OTA Transconductance GM - 200 - μS Transconductance Sink and Source Current Capability ISS - 100 - μA Slope Compensation 34845 34845A 34945B VSLOPE - - - 0.52 0.73 0.22 - - - V/ μs LED DRIVER LED Driver Sink Current RISET = 51 kΩ 0.1%, PWM = 3.3 V RISET = 5.1 kΩ 0.1%, PWM = 3.3 V ILED 2.88 29.4 3.0 30 3.12 30.6 mA ISET Pin Voltage RISET = 5.1 kΩ 0.1% VISET 2.011 2.043 2.074 V Regulated Minimum Voltage Across LED Drivers Pulse Width > 400ns VMIN 0.675 0.75 0.825 V LED Current Channel to Channel Tolerance 10 mA ≤ ILED ≤ 30 mA 3.0 mA ≤ ILED < 10 mA ITOLERANCE -2.0 -4.0 - - 2.0 4.0 % Notes 9. The OVP level must be set 5.0 V above the worst-case LED string voltage. Table 3. Static and Dynamic Electrical Characteristics (continued) Characteristics noted under conditions VIN = 12 V, VOUT = 35 V, ILED = 30 mA, fS = 600 kHz, fPWM = 600 Hz - 40°C ≤ TA ≤ 85 °C, unless otherwise noted. Typical values noted reflect the approximate parameter means at TA = 25°C under nominal conditions, unless otherwise noted. Characteristic Symbol Min Typ Max Unit |
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Similar Description - MC34845 |
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