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UC2874-2 데이터시트(PDF) 8 Page - Texas Instruments |
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UC2874-2 데이터시트(HTML) 8 Page - Texas Instruments |
8 / 12 page 8 UC1874-1,-2 UC2874-1,-2 UC3874-1,-2 amplifier. An ultra low power sleep mode is also invoked from the SS pin. A voltage level below 0.5V on this pin reduces total standby current to less than 50mA. Short circuit protection is inherent to the average current mode technique with proper compensation of the current amplifier. To prevent operation of the MOSFETs with an inadequete drive signal, an undervoltage lockout circuit suppresses the output drivers until the input supply voltage is sufficiently high enough for proper operation. The UC3874-1 is intended for applications with logic level MOSFETs and its VCC turn-on and turn-off thresholds are 4.5V/4.4V respectively. The UC3874-2 is intended for applications with standard MOSFETs and has UVLO turn-on and turn-off thresholds of 10V and 9V respectively. The precision 2.5V reference can provide 20mA to power external circuitry. The reference output is disabled during UVLO and sleep modes. UC 874 – ORDERING INFORMATION UVLO Turn On/Off Threshold Package Temperature Range 1: 4.5V/4.4V J: Ceramic DIL-18 1: –55°C to +125°C 2: 10V/9V N: Plastic DIL-18 2: –40°C to +85°C DW: SOIC-18 3: 0°C to +70°C 4 5 6 7 8 9 10 11 -75 -25 25 75 125 TEMPERATURE °C TYPICAL PERFORMANCE INFORMATION Figure 1. Supply Current 1.95 1.96 1.97 1.98 1.99 2 2.01 2.02 2.03 2.04 2.05 -50 -25 0 255075 100 TEMPERATURE °C Figure 2. VAMP Input Voltage 80 90 100 110 120 130 140 -75 -25 25 75 125 TEMPERATURE °C Figure 4. Oscillator Frequency vs. Temperature (CT = 680pF) 560 600 640 680 720 760 -50 -25 0 25 50 75 100 TEMPERATURE °C Figure 3. Volt Amp GM (IOUT =10 A) |
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