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參數(shù)資料
| 型號： | TPS40303DRCT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 330 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | 3 X 3 MM, GREEN, PLASTIC, SON-10 |
| 文件頁數(shù)： | 9/31頁 |
| 文件大?。?/td> | 1798K |
| 代理商： | TPS40303DRCT |
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BP
G1
G2
C
100 MAX(Q
,Q
)
=
( )
1
OC
LOAD
RIPPLE
DS on Q1
2
V
(1.3 I
I
) 1.2 R
(1.3 10 A
3.5 A) 1.2 4.6m
62.1mV
=
-
=
-
W =
OC
OCLOS(min)
CS
OCSET(min)
V
62.1mV
( 8mV)
R
3.69k
3.74k
2 I
2 9.5 A
-
- -
=
W
W
m
FB
OUT
FB
V
R4
0.600 V
10.0 k
R5
5.0 k
4.99 k
V
1.8 V
0.600 V
W
=
W
W
-
www.ti.com
SLUS964 – NOVEMBER 2009
(15)
Since Q1 is larger than Q2, and the total gate charge of Q1 is 10 nC, a BP capacitor of 1.0 F is calculated. A
standard value of 1.0 F is selected to limit noise on the BP regulator.
Short Circuit Protection (R11)
The TPS40305 uses the negative drop across the low-side FET at the end of the OFF time to measure the
inductor current. Allowing for 30% over maximum load and 20% rise in RDS(on)Q1 for self-heating, the voltage drop
across the low-side FET at current limit is given by Equation 16.
(16)
The TPS40305 internal temperature coefficient helps compensate for the MOSFET’s RDS(on) temperature
coefficient, so the current limit programming resistor is selected by Equation 17.
(17)
Feedback Divider (R4, R5)
The TPS40305 controller uses a full operational amplifier with an internally fixed 0.600-V reference. R4 is
selected between 10 k
Ωand 50 kΩ for a balance of feedback current and noise immunity. With R4 set to 10 kΩ,
The output voltage is programmed with a resistor divider given by Equation 18.
(18)
Compensation: (C2, C3, C4, R3, R6)
Using the TPS40k Loop Stability Tool for 100 kHz bandwidth and 60° phase margin with a R4 value of 10.0 k
Ω,
the following values are returned.
C2 = C_1 = 820 pF
C3 = C_3 = 150 pF
C4 = C_2 = 3300 pF
R3 = R_2 = 422
Ω
R6 = R_3 = 2.20 k
Ω
Copyright 2009, Texas Instruments Incorporated
17
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