ZHCSK44G December 2009 – November 2022 UCC28C40-Q1 , UCC28C41-Q1 , UCC28C42-Q1 , UCC28C43-Q1 , UCC28C44-Q1 , UCC28C45-Q1
PRODUCTION DATA
The absolute maximum supply voltage is 20 V, including any transients that may be present. If this voltage is exceeded, device damage is likely. This is in contrast to the predecessor bipolar devices, which could survive up to 30 V. Thus, the supply pin must be decoupled as close to the GND pin as possible. Also, because no clamp is included in the device, the supply pin must be protected from external sources which could exceed the 20-V level.
To prevent false triggering due to leading edge noises, an RC current sense filter may be required on CS. Keep the time constant of the RC filter well below the minimum on-time pulse width.
To prevent noise problems with high-speed switching transients, bypass VREF to ground with a ceramic capacitor close to the device package. A minimum of 0.1-μF ceramic capacitor is required. Additional VREF bypassing is required for external loads on the reference. An electrolytic capacitor may also be used in addition to the ceramic capacitor.