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参数资料
| 型号： | TPS2491DGSG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO10 |
| 封装： | GREEN, PLASTIC, MSOP-10 |
| 文件页数： | 7/24页 |
| 文件大小： | 534K |
| 代理商： | TPS2491DGSG4 |
R
DSON(MAX) v
T
J(MAX) * TA(MAX)
R
q
JA
I2
MAX
P
LIM v 0.7
T
J(MAX)2 *
I2
MAX
R
DSON
R
q
CA ) TA(MAX)
R
q
JC
V
PROG +
P
LIM
10
I
LIM
where I
LIM +
0.05
R
S
R4
R3 ) R4
+
V
PROG
V
REF
C
O
P
LIM
2
I2
LIM
)
C
O
V2
VCC(MAX)
2
P
LIM
if P
LIM t ILIMVVCC(MAX)
t
ON +
C
O
V
VCC(MAX)
I
LIM
if P
LIM w ILIM VVCC(MAX)
C
T + 8.5
10*6
t
ON
1 ) COUT_TOL ) CT_TOL
V
ON +
1.35 V
R2
R1)R2
V
OFF +
1.25 V
R2
R1)R2
SLVS503C
– NOVEMBER 2003 – REVISED SEPTEMBER 2011
(5)
where TJ(MAX) is the desired maximum steady-state junction temperature (typically 125°C), and TA(MAX) is the
maximum ambient temperature. RθJA, the junction-to-ambient thermal resistance, depends upon the package
style chosen and the details of heat-sinking and cooling. Note the RθJC and RθJA for use below.
STEP 3. Choose PLIM, R3, R4
M1 dissipates large amounts of power during power-up or output short circuit. The power limit PLIM of the
TPS2940/91 should be set to prevent the die temperature from exceeding a short term maximum temperature,
TJ(MAX)2. The short-term TJ(MAX)2 could be set as high as 150°C while still leaving ample margin to the usual
manufacturer
’s rating of 175°C. An expression for calculating PLIM is:
(6)
where RθJC is M1 junction-to-case thermal resistance, RDS(on) is the channel resistance at the maximum operating
temperature, and the factor of 0.7 represents the tolerance of the constant power engine. Next calculate VPROG
and the divider resistors R3 and R4. R3 must be greater than 4 k
, but it is recommended that 10 k or greater
be used.
(7)
STEP 4. Choose tON, CT
The on-time, tON, set by capacitor CT must suffice to fully charge the load capacitance CO without triggering the
fault circuitry. Assuming that only the load capacitance draws current during startup:
(8)
Using this value of tON, CTis computed as:
(9)
where CT_TOL and COUT_TOL are the tolerances associated with each capacitor. Assuming CO is a 20% tolerance
part, COUT_TOL has a value of 0.2. This expression assures the worst case set of parts will always start.
STEP 5. Choose The Turn On Voltage, R1 and R2
Assuming that EN is used as an analog input, the turn-on voltage, VON and turn-off voltage, VOFF are defined as:
(10)
Use caution in selecting large values of R1 and R2 because the leakage current causes errors in the threshold
voltages.
Copyright
2003–2011, Texas Instruments Incorporated
15
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