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參數(shù)資料
| 型號： | TPS56121DQPT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 1100 kHz SWITCHING FREQ-MAX, PDSO22 |
| 封裝： | ROHS COMPLIANT, PLASTIC, SON-22 |
| 文件頁數(shù)： | 7/25頁 |
| 文件大?。?/td> | 653K |
| 代理商： | TPS56121DQPT |
m
=
OUT
CHARGE
SS
V
C
1.2 V
275 F
I
0.22 A
t
1.5 ms
(
)
(
)
(
)
=
+
+
=
+
+
=
1
OUT(max)
RIPPLE
CHARGE
L peak
2
I
15 A
3.2A
0.22 A
16.8 A
m
=
=
=
SS
FB
I
10 A
C
t
1.5 ms
25 nF
22nF
V
0.6 V
=
-
+
W =
-
+
W =
W
W
÷
÷
÷
÷
è
è
è
è
RIPPLE
OCSET
OUT(max)
I
3.2 A
R
95
1.3
I
500
95
1.3
15 A
500
2.20 k
2.87 k
2
SLUSAH4
– MARCH 2011
Inductor Peak Current Rating
With output capacitance, it is possible to calculate the charge current during start-up and determine the minimum
saturation current rating for the inductor. The start-up charging current is approximated by Equation 7.
(7)
(8)
Table 2. Inductor Requirements Summary
PARAMETER
VALUE
UNITS
L
Inductance
680
nH
IL(rms)
RMS current (thermal rating)
15.03
A
IL(peak)
Peak current (saturation rating)
16.8
A
PG0871.681NL, 680-nH, 2.3-m
Ω, 24-A inductor is selected with a 24-A saturation current and 19-ARMS thermal
rating. A physically larger inductor with a lower DCR could be selected for higher efficiency, but this small
inductor better meets the 0.6 maximum PCB area requirement.
Bootstrap Capacitor (C14)
The bootstrap capacitor maintains power to the high-side driver during the high-side switch ON time. Per the
requirements of the integrated MOSFET, the value of CBOOT is 100 nF with a minimum 10-V rating.
Bootstrap Resistor (R2)
The bootstrap resistor slows the rising edge of the SW voltage to reduce ringing and improve EMI. Per the
datasheet recommendation a 5.1-
Ω resistor is selected.
VDD Bypass Capacitor (C11)
Per the TPS56221 recommended pin terminations, VDD is bypassed to GND with a 1.0-
F capacitor.
BP5 Bypass Capacitor (C12)
Per the TPS56221 recommended pin terminations, VDD is bypassed to GND with at least 1.0-
F capacitor. For
additional filtering and noise immunity, a 4.7-
F capacitor is selected.
Soft-Start Capacitor (C13)
The soft-start capacitor provides a constant ramp voltage to the error amplifier to provide controlled, smooth
start-up. The soft-start capacitor is sized using Equation 9.
(9)
Current Limit (R1)
The TPS56221 uses the negative drop across the internal low-side FET at the end of the OFF-time to measure
the valley of the inductor current. Allowing for a minimum of 30% over maximum load, the programming resistor
is selected using Equation 10.
(10)
Copyright
2011, Texas Instruments Incorporated
15
Product Folder Link(s) :TPS56121
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