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UC2910 数据表(PDF) 3 Page - Texas Instruments |
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UC2910 数据表(HTML) 3 Page - Texas Instruments |
3 / 7 page UC1910 UC2910 UC3910 PARAMETER TEST CONDITIONS MIN TYP MAX UNITS Monitor Circuitry (Note 2) (cont.) VSENSE OVP Threshold Voltage Code 0, Ratio = 0.45 3.937 4.025 4.113 V Code 0, Ratio = 0.9 4.41 4.55 4.69 V Code 15, Ratio = 0.45 2.235 2.3 2.365 V Code 15, Ratio = 0.9 2.505 2.6 2.695 V OV, UV Comparator Hysteresis Code 0, Ratio = 0.9 70 88 120 mV Code 15, Ratio = 0.45 15 25 40 mV OVP Comparator Hysteresis Code 0, Ratio = 0.9 160 218 300 mV Code 15, Ratio = 0.45 40 62 85 mV Input Common Mode Range OV, UV, OVP Comparators 0 5 V Propagation Delay OV, UV Comparators 5 µs OVP Comparator 5 µs PWRGOOD, OVP, OVPB Outputs PWRGOOD Voltage Low IPWRGOOD = 10mA 0.4 V OVP Sourcing Current VOVP = 1.4V 65 mA OVPB Voltage Low IOVPB = 1mA 0.4 V ELECTRICAL CHARACTERISTICS (cont.) Unless otherwise specified, VCC = 12V, VSENSE = 3.5V, VOVTH/UVTH = 1.26V, VD0 = VD1 = VD2 = VD3 = 0V, 0°C < TA < 70°C for the UC3910, –25°C < TA < 80°C for the UC2910, –55°C < TA < 125°C for the UC1910 TA = TJ. D0-D3 (DAC Digital Input Control Codes): These are the DAC digital input control codes, with D0 repre- senting the least significant bit (LSB) and D3, the most significant bit (MSB) (See Table 1). A bit is set low by being connected to GND; a bit is set high by floating it, or connecting it to a 3V to 5V voltage source. Each con- trol pin is pulled up to approximately 4.8V by an internal 40 µA current source. DACBUF (Buffered DACOUT Voltage): This pin pro- vides a buffered version of the DACOUT voltage to al- low external programming of the OV/UV thresholds (see OVTH/UVTH below). DACOUT (Digital-to-Analog Converter Output Volt- age): This pin is the output of the 4-bit digital to analog (DAC) converter. Setting all input control codes low pro- duces 3.5V at DACOUT; setting all codes high pro- duces 2.0V at DACOUT. The LSB step size (i.e. resolution) is 100mV (See Table 1). The DACOUT source impedance is typically 3k Ω and must therefore drive a high impedance input. Bypass DACOUT at the driven input with a 0.01 µF, low ESR, low ESL capacitor for best circuit noise immunity. GND (Signal Ground): All voltages are measured with respect to GND. The two GND pins are connected to- gether internally but should also be connected exter- nally using a short PC board trace. Bypass capacitors on the VCC and VREF pins should be connected di- rectly to the ground plane near one of the signal ground PIN DESCRIPTIONS Note 1: "Line, Load" implies that the parameter is tested at all combinations of the conditions: 10.8V < VCC < 13.2V, –2mA < IVREF < 0mA. Note 2: These are the actual voltages on VSENSE which will cause the OVPB and PWRGOOD outputs to switch, assuming the DACOUT voltage is perfect. These limits apply for 0°C < TA < 70°C. Note 3: "Code 0" means pins D0 - D4 are all low; "Code 15" means they are all floating or high (See Table 1). "Ratio" is the divider ratio of the resistor string between DACBUF and OVTH/UVTH (See Figure 1). Decimal Code D3 D2 D1 D0 DACOUT Voltage 15 1111 2.0 14 1110 2.1 13 1101 2.2 12 1100 2.3 11 1011 2.4 10 1010 2.5 91001 2.6 81000 2.7 70111 2.8 60110 2.9 50101 3.0 40100 3.1 30011 3.2 20010 3.3 10001 3.4 00000 3.5 Table 1. Programming the DACOUT Voltage 3 |
类似零件编号 - UC2910 |
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类似说明 - UC2910 |
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