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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PM8805 датащи(PDF) 12 Page - STMicroelectronics |
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PM8805 датащи(HTML) 12 Page - STMicroelectronics |
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12 / 45 page  Electrical specifications PM8805 12/45 DS12813 Rev 1 3.3 Thermal data Table 5. Thermal data Symbol Parameter Max. value Unit RTHJA Thermal resistance junction to ambient(1) 1. Device mounted on a 4" x 4" wide, 4-layer board (2 signal + 2 power), Cu thickness 35 micron, with: - 4 small exposed pad (EP1-4) copper areas connected to two power planes plus an external layer of 0.12"x0.12" inches minimum size; those areas are connected together with a minimum of 2x3 via holes. - a large central exposed pad (EP5) and hot swap exposed pad (EP6) copper area connected to two power planes of 1"x1" inches plus two layers with "minimum pad size shape": those areas are connected with a minimum of 3 times 2x3 via holes placed close the dissipating zone of the device. See Section 7 for more details. 30 °C/W RTHJB Thermal resistance junction to board(1) 15 °C/W Pd max Maximum power dissipation of device(2) 2. Device mounted on the board as described in Note 1 and Tambient = 85°C. The indicated maximum power dissipation for the device has been calculated as: (TJmax -TAmax) / RTHJA. The estimated worst case device power dissipation in 4P application is: Bridge+ HotSwap+ Controller=4 x 0.15 Ω x 1A2 + 0.15Ω x 2 A2 + 0.1W = 1.3W. 1.3 W TA Operative ambient temperature range(3) 3. Heat sink is needed in order to not reach device thermal limitation. -40 to 85 °C |
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