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UC2827N-1 Datasheet(PDF) 5 Page - Texas Instruments |
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UC2827N-1 Datasheet(HTML) 5 Page - Texas Instruments |
5 / 15 page www.ti.com ELECTRICAL CHARACTERISTICS UC1827-1, UC1827-2 UC2827-1, UC2827-2 UC3827-1, UC3827-2 SLUS365A – APRIL 1999 – REVISED AUGUST 2005 Terminal Functions (continued) TERMINAL I/O DESCRIPTION N or NAME Q DW 5Soft-start pin requires a capacitor to GND. During soft-start the output of the voltage error amplifier is SS 4 5 O clamped to the soft-start capacitor voltage which is slowly charged by an internal current source. In UVLO, SS is held low. A bidirectional pin for the oscillator., used to synchronize several chips to the fastest oscillator. Its input synchronization threshold is 1.4 V. The SYNC voltage is 3.6 V when the oscillator capacitor, CT, is SYNC 19 21 I discharged. Otherwise it is 0 V. If the recommended synchronization circuit is not used, a 1 k Ω or lower value resistor from SYNC to GND may be needed to increase the fall time of the signal at SYNC. A voltage source connected to this pin supplies the power for the UC3827. It is recommended to bypass VCC 23 27 I this pin to both GND and PGND ground connections with good quality high frequency capacitors VEA+ 14 15 I Non-inverting input of the voltage error amplifier VEA- 16 18 I Inverting input of the voltage error amplifier VEAO 10 11 O Output of the voltage error amplifier Supply voltage for the buck output. The floating driver of the UC3827 uses the bootstrap technique which requires a reservoir capacitor to store the required energy for the on time of the buck switch. A V+ 1 1 I diode must be connected from VCC to V+ to charge the reservoir capacitor. This diode must be able to withstand VIN. The reservoir capacitor must be connected between V+ and SRC. Unless otherwise spsecified, V VCC = 15 V, VV+ = 14.3 V, CCT = 340 pF, RRT = 10 kΩ, RDELAY = 24.3 kΩ, VSRC = VGND = VBUCK= V PUSH = VPULL outputs no load, TJ = TA PARAMETER TEST CONDITIONS MIN TYP MAX UNIT SUPPLY VCC UVLO, Turn-on 8.3 8.8 9.5 V Hysteresis 0.9 1.2 1.5 V IVCC Supply current start VVCC = 8 V 1000 µA IVCC Supply current run 32 45 mA IV+ buck high 0.2 1 2 mA VOLTAGE ERROR AMPLIFIER IB 0.5 3 µA VIO 10 mV AVOL 80 95 dB GBW(1) Gain bandwidth 1 4 MHz VOL Low-level output voltage IVEAO = 0 µA (No load) 0.3 0.5 V VOH High-level output voltage IVEAO = 0 µA (No load) 2.85 3 3.20 V CURRENT SENSE AMPLIFIER IB –1 –5 µA VIO 5 mV AVOL 80 110 dB GBW (1) Gain bandwidth 15 29 MHz VOL Low-level output voltage ICEAO = 0 µA (No load) 0.25 0.5 V VOH High-level output voltage ICEAO = 0 µA (No load) 3 3.3 V CMRR Common mode range(1) -0.3 2 V CURRENT ERROR AMPLIFIER IB –1 –5 µA VIO 10 mV AVOL 80 110 dB (1) Ensured by design. Not production tested. 5 |
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