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參數(shù)資料
| 型號： | LT3493EDCB-3#TR |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 2.2 A SWITCHING REGULATOR, 815 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封裝： | 2 X 3 MM, PLASTIC, MO-229, DFN-6 |
| 文件頁數(shù)： | 19/20頁 |
| 文件大?。?/td> | 401K |
| 代理商： | LT3493EDCB-3#TR |
8
LT3493-3
3493-3f
VSW
20V/DIV
VOUT
200mV/DIV
AC COUPLED
COUT = 10F
VOUT = 3V
VIN = 30V
ILOAD = 0.75A
L = 10
H
2
s/DIV
3493-3 F01
IL
0.5A/DIV
APPLICATIO S I FOR ATIO
WU
U
FB Resistor Network
The output voltage is programmed with a resistor divider
between the output and the FB pin. Choose the 1%
resistors according to:
RR
V
OUT
12
078
1
=
.
–
R2 should be 20k or less to avoid bias current errors.
Reference designators refer to the Block Diagram.
An optional phase lead capacitor of 22pF between VOUT
and FB reduces light-load output ripple.
Input Voltage Range
The input voltage range for LT3493-3 applications de-
pends on the output voltage and on the absolute maximum
ratings of the VIN and BOOST pins.
The minimum input voltage is determined by either the
LT3493-3’s minimum operating voltage of 6.8V, or by its
maximum duty cycle. The duty cycle is the fraction of time
that the internal switch is on and is determined by the input
and output voltages:
DC
VV
V
OUT
D
IN
SW
D
=
+
–
where VD is the forward voltage drop of the catch diode
(~0.4V) and VSW is the voltage drop of the internal switch
(~0.4V at maximum load). This leads to a minimum input
voltage of:
V
VV
DC
VV
IN MIN
OUT
D
MAX
D
SW
()
–
=
+
with DCMAX = 0.91 (0.88 over temperature).
The maximum input voltage is determined by the absolute
maximum ratings of the VIN and BOOST pins. For con-
stant-frequency operation, the maximum input voltage is
determined by the minimum duty cycle, DCMIN = 0.10. If
the duty cycle requirement is less than DCMIN, the part will
enter pulse-skipping mode. The onset of pulse-skipping
occurs at:
V
VV
DC
VV
IN PS
OUT
D
MIN
D
SW
()
–
=
+
In pulse-skipping mode, the part skips pulses to control
the inductor current and regulate the output voltage,
possibly producing a spectrum of frequencies below
750kHz.
Note that this is a restriction on the operating input voltage
to remain in constant-frequency operation; the circuit will
tolerate transient inputs up to the absolute maximum
ratings of the VIN and BOOST pins when the output is in
regulation. The input voltage should be limited to VIN(PS)
during overload conditions (short-circuit or start-up).
Figure 1
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