UCC5350SB Datasheet, PDF (25/35 Pages) Texas Instruments – 3-kVRMS Single-Channel Isolated Gate Driver with 8-V UVLO

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9.2.4 Application Curve
UCC5350SB
SLLSF39 – SEPTEMBER 2017
V_CC2 = 20 V
V_EE2 = GND f_SW = 10 kHz
Figure 23. PWM Input And Gate Voltage Waveform
10 Power Supply Recommendations
The recommended input supply voltage (V_CC1) for the UCC5350SB device is from 3 V to 15 V. The lower limit of
the range of output bias-supply voltage (V_CC2) is determined by the internal UVLO protection feature of the
device. The V_CC1 and V_CC2 voltages should not fall below their respective UVLO thresholds for normal operation,
or else the gate-driver outputs can become clamped low for more than 50 μs by the UVLO protection feature. For
more information on UVLO, see the Undervoltage Lockout (UVLO) section. The higher limit of the V_CC2 range
depends on the maximum gate voltage of the power device that is driven by the UCC5350SB device, and should
not exceed the recommended maximum V_CC2 of 33 V. A local bypass capacitor should be placed between the
V_CC2 and V_EE2 pins, with a value of 220-nF to 10-μF for device biasing. TI recommends placing an additional
100-nF capacitor in parallel with the device biasing capacitor for high frequency filtering. Both capacitors should
be positioned as close to the device as possible. Low-ESR, ceramic surface-mount capacitors are
recommended. Similarly, a bypass capacitor should also be placed between the V_CC1 and GND1 pins. Given the
small amount of current drawn by the logic circuitry within the input side of the UCC5350SB device, this bypass
capacitor has a minimum recommended value of 100 nF.
If only a single, primary-side power supply is available in an application, isolated power can be generated for the
secondary side with the help of a transformer driver such as Texas Instruments' SN6501 or SN6505A. For such
applications, detailed power supply design and transformer selection recommendations are available in SN6501
Transformer Driver for Isolated Power Supplies data sheet and SN6505A Low-Noise 1-A Transformer Drivers for
Isolated Power Supplies data sheet.
Copyright © 2017, Texas Instruments Incorporated
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