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參數(shù)資料
| 型號： | TPS5420MDREPG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 5.2 A SWITCHING REGULATOR, 600 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | GREEN, PLASTIC, MS-012AA, SOIC-8 |
| 文件頁數(shù)： | 8/23頁 |
| 文件大小： | 658K |
| 代理商： | TPS5420MDREPG4 |
www.ti.com
Thermal Calculations
SLVS717 – DECEMBER 2006
ADVANCED INFORMATION (continued)
The following formulas show how to estimate the device power dissipation under continuous conduction mode
operations. They should not be used if the device is working at light loads in the discontinuous conduction mode.
Conduction loss: Pcon = IOUT
2
× r
DS(on)× VOUT/VIN
Switching loss: Psw = VIN× IOUT× 0.01
Quiescent current loss: Pq = VIN× 0.01
Total loss: Ptot = Pcon + Psw + Pq
Given TA => Estimated junction temperature: TJ = TA + Rth × Ptot
Given TJMAX = 125°C => Estimated maximum ambient temperature: TAMAX = TJMAX Rth × Ptot
16
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