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| 型號： | LT1506I |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Octal D-Type Edge-Triggered Flip-Flops With 3-State Outputs 20-SO 0 to 70 |
| 中文描述： | 4.5A，500kHz降壓型開關(guān)穩(wěn)壓器 |
| 文件頁數(shù)： | 14/24頁 |
| 文件大?。?/td> | 417K |
| 代理商： | LT1506I |
14
LT1506
APPLICATIO
S I
N
FOR
ATIO
U
W
U
2.38V
0.4V
GND
V
SW
LT1506
INPUT
R
FB
R
HI
1506 F04
OUTPUT
SHDN
LOCKOUT
IN
TOTAL
SHUTDOWN
3.5
μ
A
R
LO
C1
+
Figure 4. Undervoltage Lockout
Keep the connections from the resistors to the shutdown
pin short and make sure that interplane or surface capaci-
tance to the switching nodes are minimized. If high
resistor values are used, the shutdown pin should be
bypassed with a 1000pF capacitor to prevent coupling
problems from the switch node. If hysteresis is desired in
the undervoltage lockout point, a resistor R
FB
can be
added to the output node. Resistor values can be calcu-
lated from:
[
(
=
( )(
R
R
V
V V
V
R
)
A
R
R
V
V
HI
LO
IN
OUT
FB
HI
OUT
=
+
)
(
)
+
]
2 38
1
2 38
/
2 3 5
.
μ
25k suggested for R
LO
V
IN
= Input voltage at which switching stops as input
voltage descends to trip level
V = Hysteresis in input voltage level
Example: output voltage is 5V, switching is to stop if input
voltage drops below 6V and should not restart unless
input rises back to 7.5V.
V is therefore 1.5V and V
IN
= 6V.
Let R
LO
= 25k.
R
k
k
A
k
k
R
k
k
HI
FB
=
+
(
25 3 5
)
+
)
[
]
(
=
(
)
=
=
(
)
=
25 6
2 38 1 5 5
.
1
1 5
.
2 38
.
25 5 2
2 29
48 5 1 5
48
160
. /
.
.
.
/ .
μ
SWITCH NODE CONSIDERATIONS
For maximum efficiency, switch rise and fall times are
made as short as possible. To prevent radiation and high
frequency resonance problems, proper layout of the com-
ponents connected to the switch node is essential. B field
(magnetic) radiation is minimized by keeping catch diode,
switch pin, and input bypass capacitor leads as short as
possible. E field radiation is kept low by minimizing the
length and area of all traces connected to the switch pin
and BOOST pin. A ground plane should always be used
under the switcher circuitry to prevent interplane cou-
pling. A suggested layout for the critical components is
shown in Figure 5. Note that the feedback resistors and
compensation components are kept as far as possible
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