ZHCSVQ7A December 2023 – April 2024 UCC23525
ADVANCE INFORMATION
- 1
- 1 特性
- 2 應用
- 3 說明
- 4 Pin Configuration and Function
- 5 Specifications
- 6 Parameter Measurement Information
- 7 Detailed Description
- 8 Application and Implementation
- 9 Power Supply Recommendations
- 10Layout
- 11Device and Documentation Support
- 12Revision History
- 13Mechanical, Packaging, and Orderable Information
請參考 PDF 數據表獲取器件具體的封裝圖。
機械數據 (封裝 | 引腳)
- DWY|6
散熱焊盤機械數據 (封裝 | 引腳)
8.2.2.1 Selecting the Input Resistor
The input resistor limits the current that flows into the e-diode when it is forward biased. The threshold current IFLH is 1 mA typ. The recommended operating range for the forward current is 5 mA to 20 mA (e-diode ON). All the electrical specifications are ensured in this range. The resistor should be selected such that for typical operating conditions, IF is 10 mA. Following are the list of factors that will affect the exact value of this current:
- Supply Voltage VSUP variation
- Manufacturer's tolerance for the resistor and variation due to temperature
- e-diode forward voltage drop variation (at IF=10 mA, VF= typ 1.7 V, min 1.4 V, max 2 V, with a temperature coefficient < 0.9 mV/°C and dynamic impedance < 1 Ω)
See Figure 8-2 for the schematic using a single buffer and anode resistor combination to drive the input stage of UCC23525. The input resistor can be selected using Equation 1.
Figure 8-2 Driving the Input Stage of UCC23525 with One Buffer and Anode
ResistorTable 8-2 shows the range of values for REXT for Figure 8-2. The assumptions used in deriving the range for REXT are as follows:
- Target forward current IF is 5 mA min, 10 mA typ and 20 mA max
- e-diode forward voltage drop is 1.4 V to 2.
- VSUP (Buffer supply voltage) is 5 V with ±5% tolerance
- Manufacturer's tolerance for REXT is 1%
- ROH (buffer output impedance in output "High" state) is 13 Ω min, 18 Ω typ and 22 Ω max
| REXT Ω | |||
|---|---|---|---|
|
Configuration |
Min | Typ | Max |
| Single Buffer and REXT | 115 | 312 | 757 |