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UC1638 Scheda tecnica(PDF) 4 Page - Texas Instruments |
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UC1638 Scheda tecnica(HTML) 4 Page - Texas Instruments |
4 / 9 page 4 UC1638 UC2638 UC3638 Note 1: Oscillator triangle amplitude = 2.5 • PV ±AREF. Note 2: Deadband = ±(REF − DB), referenced to COMP. Note 3: Offset = AREFIN − AREF. AOUT1, BOUT1: AOUT1 and BOUT1 are open collector output drivers capable of sinking 50mA. These outputs can be pulled up to 60V maximum. With a few external components, these outputs can drive the opposite high side switches in a full bridge arrangement. AOUT2, BOUT2: AOUT2 and BOUT2 are totem pole output drivers capable of driving external power MOS- FETs directly. The peak current ratings are ±500mA. An integrated zener clamp limits the drive output amplitude to approximately 14V to prevent MOSFET gate oxide overstress. These outputs are configured to drive the opposite low side switches in a full bridge arrangement. AREF: The voltage on AREF is simply a buffered ver- sion of the voltage on AREFIN. In single supply applica- tions, AREF should be bypassed to VEE with a 0.1 µF ceramic capacitor to provide a stable reference level for the internal circuitry. AREFIN: The voltage on AREFIN is generated inter- nally by a 50% voltage divider tied between VCC and VEE. As such, it provides the mid supply reference needed for the oscillator, voltage amplifier, current am- plifier and current limit comparators when operating in single supply mode. A buffer amplifier is connected be- tween AREFIN and AREF. In bipolar supply applications AREFIN is usually connected to VEE, which disables the buffer amplifier, and AREF is connected to 0V. COMP: This is the output of the high slew rate error am- plifier. The level on COMP modulates the controller duty cycle via the PWM comparators and the oscillator ramp. Compensation and DC gain setting resistors are con- nected between COMP and INV. CS-: This is the inverting input to the X5 current sense amplifier. The common mode input range for this pin ex- tends from VEE −1V to VCC−4V. A low value resistor in PIN DESCRIPTIONS ELECTRICAL CHARACTERISTICS Unless otherwise specified; VCC = 15V, VEE =–15V, CT = 680pF, RT = 3k, VPVSET = 1.5V, VCOMP = 0V, VCSOUT = 0V, VDB = REF, VEXTREF = 0V, VSD = VCC – 3V, TA = −55°C to 125°C for the UC1638, −25°C to 85°C for the UC2638, 0°C to 70°C for the UC3638. TA =TJ. PARAMETER TEST CONDITIONS MIN TYP MAX UNITS X5 Amplifier Gain VID = 100mV to 400mV 4.75 5 5.25 V/V Common Mode Rejection VCS+,VCS − = AREF ±5V 50 65 dB −3dB Bandwidth 300 400 kHz Slew Rate Rising .75 1.5 V/ µs Slew Rate Falling .75 1.5 V/ µs Shutdown Threshold Ref. to VCC − 1.9 − 2.25 − 2.5 V Input Bias Current VSD = SD Threshold −0.5 −10 µA Current Limit Threshold Positive Measured Between CS+ and CS- 400 500 600 mV Threshold Negative Measured Between CS+ and CS- – 600 − 500 – 400 mV Propagation Delay to Outputs Overdrive = 200mV 150 250 ns Deadband Adjust Maximum Deadband VDB =0V ±5V Zero Deadband VDB = REF 0 V Deadband Adjustment Gain VDB = 1V to 4V (Note 2) ± 0.9 ± 1 ± 1.2 V/V Input Bias Current VDB = VREF 3 15 µA AREF Buffer Gain AREF / VCC − VEE 0.49 0.5 0.51 V/V Offset (Note 3) 30 100 mV (continued) |
Codice articolo simile - UC1638 |
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Descrizione simile - UC1638 |
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