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參數資料
| 型號： | TPS5450MDDAREP |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | 11.7 A SWITCHING REGULATOR, 600 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | GREEN, PLASTIC, SOIC-8 |
| 文件頁數： | 7/24頁 |
| 文件大小： | 772K |
| 代理商： | TPS5450MDDAREP |
V
OUTMIN + 0.12
V
INMAX * IOMIN
0.110 ) VD * IOMIN
R
L * VD
(14)
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
(15)
Thermal Calculations
www.ti.com ....................................................................................................................................................................................................... SLVS935 – JULY 2009
Where
VINMIN = minimum input voltage
IOMAX = maximum load current
VD = catch diode forward voltage.
RL= output inductor series resistance.
This equation assumes maximum on resistance for the internal high side FET.
The lower limit is constrained by the minimum controllable on time, which may be as high as 200 ns. The
approximate minimum output voltage for a given input voltage and minimum load current is given by:
Where
VINMAX = maximum input voltage
IOMIN = minimum load current
VD = catch diode forward voltage.
RL= output inductor series resistance.
This equation assumes nominal on resistance for the high-side FET and accounts for worst case variation of
operating frequency set point. Any design operating near the operational limits of the device should be
carefully checked to ensure proper functionality.
The design equations given in the example circuit can be used to generate circuits using the TPS5450. 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 TPS5450. Equation 15 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 R
DS(on) x VOUT/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
Copyright 2009, Texas Instruments Incorporated
15
Product Folder Link(s): TPS5450-EP
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