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| 型号： | TPS5431DDA |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 6 A SWITCHING REGULATOR, 600 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | GREEN, PLASTIC, SOP-8 |
| 文件页数： | 10/28页 |
| 文件大小： | 810K |
| 代理商： | TPS5431DDA |
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Internal Compensation Network
H(s) +
1 )
s
2p
Fz1
1 )
s
2p
Fz2
s
2p
Fp0
1 )
s
2p
Fp1
1 )
s
2p
Fp2
1 )
s
2p
Fp3
(23)
Thermal Calculations
SLVS632C – JANUARY 2006 – REVISED NOVEMBER 2006
The design equations given in the example circuit can be used to generate circuits using the
TPS5430/TPS5431. These designs are based on certain assumptions and will tend to always select output
capacitors within a limited range of ESR values. If a different capacitor type is desired, it may be possible to fit
one to the internal compensation of the TPS5430/TPS5431. Equation 23 gives the nominal frequency response
of the internal voltage-mode type III compensation network:
Where
Fp0 = 2165 Hz, Fz1 = 2170 Hz, Fz2 = 2590 Hz
Fp1 = 24 kHz, Fp2 = 54 kHz, Fp3 = 440 kHz
Fp3 represents the non-ideal parasitics effect.
Using this information along with the desired output voltage, feed forward gain and output filter characteristics,
the closed loop transfer function can be derived.
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 x Rds(on) x V
OUT/VIN
Switching Loss: Psw = VIN x IOUT x 0.01
Quiescent Current Loss: Pq = VIN x 0.01
Total Loss: Ptot = Pcon + Psw + Pq
Given TA => Estimated Junction Temperature: TJ = TA + Rth x Ptot
Given TJMAX = 125°C => Estimated Maximum Ambient Temperature: TAMAX = TJMAX– Rth x Ptot
18
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