參數(shù)資料
型號： TPS56221DQPR
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, PDSO22
封裝： ROHS COMPLIANT, PLASTIC, SON-22
文件頁數(shù)： 7/25頁
文件大小： 655K
代理商： TPS56221DQPR
m
=
OUT
CHARGE
SS
V
C
1.2 V
586 F
I
0.469 A
t
1.5 ms
(
)
(
)
(
)
=
+
+
=
+
+
=
1
OUT(max)
RIPPLE
CHARGE
L peak
2
I
25 A
7.8A
0.469 A
29.4 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
7.8 A
R
95
1.3
I
500
95
1.3
25 A
500
3.23 k
3.32 k
2
(
)
W
=
W
W
-
FB
BIAS
OUT
FB
V
R
0.600 V
20.5 k
R
20.5 k
1.2 V
0.600 V
V
SLUSAH5
– 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 9.
(9)
(10)
Table 2. Inductor Requirements Summary
PARAMETER
VALUE
UNITS
L
Inductance
300
nH
IL(rms)
RMS current (thermal rating)
25.08
A
IL(peak)
Peak current (saturation rating)
29.4
A
Boot-Strap Capacitor (C14)
The bootstrap resistor slows the rising edge of the SW voltage to reduce ringing and improve EMI. Per the
datasheet recommendation a 5.1? resistor is selected.
VDD Bypass Capacitor (C11)
Per the TPS56221 recommended pin terminations, VDD is bypassed to GND with a 1.0-
F capacitor.
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 11.
(11)
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 12.
(12)
Feedback Divider (R4, R7)
The TPS56221 converter uses a full operational amplifier with an internally fixed 0.600-V reference. R4 is
selected between 10 k
Ω and 50 kΩ for a balance of feedback current and noise immunity. With R4 set to
20.5 k
Ω, The output voltage is programmed with a resistor divider given by Equation 13.
(13)
Copyright
2011, Texas Instruments Incorporated
15
Product Folder Link(s) :TPS56221
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