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MAX16801AEUA Datasheet(PDF) 3 Page - Maxim Integrated Products |
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MAX16801AEUA Datasheet(HTML) 3 Page - Maxim Integrated Products |
3 / 15 page Off-Line and DC-DC PWM Controllers for High-Brightness LED Drivers _______________________________________________________________________________________ 3 Note 1: All devices are 100% tested at TA = +85°C. All limits over temperature are guaranteed by characterization. Note 2: VREF is measured with DIM/FB connected to the COMP pin (see the Functional Diagram). Note 3: The MAX16801 is intended for use in universal input off-line drivers. The internal clamp circuit is used to prevent the boot- strap capacitor (C1 in Figure 5) from charging to a voltage beyond the absolute maximum rating of the device when EN/UVLO is low. The maximum current to IN (hence to clamp) when UVLO is low (device in shutdown), must be externally limited to 2mA (max). Clamp currents higher than 2mA may result in clamp voltage higher than +30V, thus exceeding the absolute maximum rating for IN. For the MAX16802, do not exceed the +24V maximum operating voltage of the device. ELECTRICAL CHARACTERISTICS (continued) (VIN = +12V (MAX16801: VIN must first be brought up to +23.6V for startup), 10nF bypass capacitors at IN and VCC, CNDRV = 0, VUVLO = +1.4V, VDIM/FB = +1.0V, COMP = unconnected, VCS = 0V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS CURRENT-SENSE COMPARATOR Current-Sense Trip Threshold VCS 262 291 320 mV CS Input Bias Current ICS VCS = 0V -2 +2 µA Propagation Delay From Comparator Input to NDRV tPWM 50mV overdrive 60 ns Switching Frequency fSW 230 262 290 kHz MAX1680_A 50 50.5 Maximum Duty Cycle DMAX MAX1680_B 75 76 % IN CLAMP VOLTAGE IN Clamp Voltage VINC 2mA sink current, MAX16801 only (Note 3) 24.1 26.1 29.0 V ERROR AMPLIFIER Voltage Gain RLOAD = 100k Ω 80 dB Unity Gain Bandwidth RLOAD = 100k Ω, CLOAD = 200pF 2 MHz Phase Margin RLOAD = 100k Ω, CLOAD = 200pF 65 degrees DIM/FB Input Offset Voltage 3mV High 2.2 3.5 COMP Pin Clamp Voltage Low 0.4 1.1 V Source Current 0.5 mA Sink Current 0.5 mA Reference Voltage VREF (Note 2) 1.218 1.230 1.242 V Input Bias Current 50 nA COMP Short-Circuit Current 8mA THERMAL SHUTDOWN Thermal-Shutdown Temperature 130 °C Thermal Hysteresis 25 °C DIGITAL SOFT-START Soft-Start Duration 15,872 clock cycles Reference Voltage Steps During Soft-Start 31 steps Reference Voltage Step 40 mV |
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