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参数资料
| 型号： | LTC1436AEGN#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| 中文描述： | 2 A SWITCHING CONTROLLER, 400 kHz SWITCHING FREQ-MAX, PDSO24 |
| 封装： | 0.150 INCH, PLASTIC, SSOP-24 |
| 文件页数： | 4/28页 |
| 文件大小： | 493K |
| 代理商： | LTC1436AEGN#PBF |
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12
LTC1436A
LTC1436-PLL-A/LTC1437A
14367afb
APPLICATIONS INFORMATION
WU
U
OPERATING FREQUENCY (kHz)
C
OSC
VALUE
(pF)
300
250
200
150
100
50
0
100
200
300
400
1436 F02
500
0
VPLLLPF = 0V
Figure 2. Timing Capacitor Value
Inductor Value Calculation
The operating frequency and inductor selection are inter-
related in that higher operating frequencies allow the use
of smaller inductor and capacitor values. So why would
anyone ever choose to operate at lower frequencies with
larger components? The answer is efficiency. A higher
frequency generally results in lower efficiency because of
MOSFET gate charge losses. In addition to this basic
trade-off, the effect of inductor value on ripple current and
low current operation must also be considered.
The inductor value has a direct effect on ripple current. The
inductor ripple current
IL decreases with higher induc-
tance or frequency and increases with higher VIN or VOUT:
CpF
Frequency kHz
OSC
()=
()
137 10
11
4
.(
)
–
A graph for selecting COSC vs frequency is given in Figure
2. As the operating frequency is increased the gate
charge losses will be higher, reducing efficiency (see
Efficiency Considerations). The maximum recommended
switching frequency is 400kHz. When using Figure 2 for
synchronizable applications, choose COSC correspond-
ing to a frequency approximately 30% below your center
frequency. (See Phase-Locked Loop and Frequency Syn-
chronization.)
For low duty cycle, high frequency applications where the
required minimum on-time,
t
V
Vf
ON MIN
OUT
IN MAX
()
= ()( )
is less than 350ns, there may be further restrictions on the
inductance to ensure proper operation. See Minimum On-
Time Considerations section for more details.
OPERATING FREQUENCY (kHz)
0
INDUCTOR
VALUE
(
H)
60
50
40
30
20
10
0
50
100
150
200
1436 F03
250
300
VOUT = 5V
VOUT = 3.3V
VOUT ≤ 2.5V
Figure 3. Recommended Inductor Values
I
fL
V
L
OUT
IN
= ()( )
1
Accepting larger values of
IL allows the use of low
inductances, but results in higher output voltage ripple
and greater core losses. A reasonable starting point for
setting ripple current is
IL = 0.4 (IMAX). Remember, the
maximum
IL occurs at the maximum input voltage.
The inductor value also has an effect on low current
operation. The transition to low current operation begins
when the inductor current reaches zero while the bottom
MOSFET is on. Lower inductor values (higher
IL) will
cause this to occur at higher load currents, which can
cause a dip in efficiency in the upper range of low current
operation. In Burst Mode operation (TGS pin open),
lower inductance values will cause the burst frequency to
decrease.
The Figure 3 graph gives a range of recommended induc-
tor values vs operating frequency and VOUT.
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