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參數(shù)資料
| 型號： | LTC3830ES |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 16-Bit Bus Transceiver With 3-State Outputs 54-BGA MICROSTAR JUNIOR -40 to 85 |
| 中文描述： | SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | 0.150 INCH, PLASTIC, SO-16 |
| 文件頁數(shù)： | 12/24頁 |
| 文件大?。?/td> | 305K |
| 代理商： | LTC3830ES |
12
LTC3830/LTC3830-1
sn3830 3830fs
filter capacitors. 100
and 4.7
μ
F usually provide ad-
equate filtering for V
CC
. For best performance, connect the
4.7
μ
F bypass capacitor as close to the LTC3830 V
CC
pin as
possible.
Gate drive for the top N-channel MOSFET Q1 is supplied
from PV
CC1
. This supply must be above V
IN
(the main
power supply input) by at least one power MOSFET V
GS(ON)
for efficient operation. An internal level shifter allows PV
CC1
to operate at voltages above V
CC
and V
IN
, up to 14V maxi-
mum. This higher voltage can be supplied with a separate
supply, or it can be generated using a charge pump.
Gate drive for the bottom MOSFET Q2 is provided through
PV
CC2
for the 16-lead LTC3830 or V
CC
/PV
CC2
for the
LTC3830-1 and the 8-lead LTC3830. This supply only
needs to be above the power MOSFET V
GS(ON)
for efficient
operation. PV
CC2
can also be driven from the same supply/
charge pump for the PV
CC1
, or it can be connected to a
lower supply to improve efficiency.
Figure 8 shows a tripling charge pump circuit that can be
used to provide 2V
IN
and 3V
IN
gate drive for the external
top and bottom MOSFETs respectively. These should fully
enhance MOSFETs with 5V logic level thresholds. This
circuit provides 3V
IN
– 3V
F
to PV
CC1
while Q1 is ON and
2V
IN
– 2V
F
to PV
CC2
where V
F
is the forward voltage of the
Schottky diodes. The circuit requires the use of Schottky
diodes to minimize forward drop across the diodes at
start-up. The tripling charge pump circuit can rectify any
ringing at the drain of Q2 and provide more than 3V
IN
at
PV
CC1
; a 12V zener diode should be included from PV
CC1
to PGND to prevent transients from damaging the circuitry
at PV
CC1
or the gate of Q1.
Care should be taken when using a charge pump to power
PV
CC1
in applications with low V
CC
supply voltages (less
than 4V) or high switching frequencies. The charge pump
capacitors refresh when the G2 pin goes high and the
switch node is pulled low by Q2. The G2 on-time becomes
narrow when LTC3830 operates at maximum duty cycle
(95% typical), which can occur if the input supply rises
more slowly than the soft-start capacitor or the input
voltage droops during load transients. If the G2 on-time
gets so narrow that the switch node fails to pull completely
to ground, the charge pump voltage may collapse or fail to
start, causing excessive dissipation in external MOSFET
Q1. This is most likely with low V
CC
voltages and high
switching frequencies, coupled with large external
MOSFETs which slow the G2 and switch node slew rates.
Workarounds include:
Increasing the soft-start capacitor to limit the duty cycle
at start up
Using smaller MOSFETs with lower gate capacitance
(where possible) to reduce the G2 rise/fall time and
switch node slew rates
Using an external higher voltage supply to power PV
CC1
if available
Another alternative is to add an external circuit to limit the
duty cycle when PV
CC1
is low, as shown in Figure 9b. If the
charge pump is not running, PV
CC1
will be less than or
equal to V
CC
and the voltage at the soft-start pin will be
about (V
CC
/6 + V
BE
). This is about 1.2V with a V
CC
of 3.3V,
which limits the duty cycle to about 50% and allows the
charge pump to start up. Once PV
CC1
rises higher than
(V
CC
+ V
TQ3
), the voltage at the soft-start pin goes high and
the limit on duty cycle is removed.
For applications with a 5V or higher V
IN
supply, PV
CC2
can
be tied to V
IN
if a logic level MOSFET is used. PV
CC1
can be
supplied using a doubling charge pump as shown in Figure
9a. This circuit provides 2V
IN
– V
F
to PV
CC1
while Q1 is ON.
APPLICATIOU
W
U
U
Figure 8. Tripling Charge Pump
LTC3830
3830 F08
+
D
Z
12V
1N5242
10
μ
F
G1
G2
0.1
μ
F
Q1
L
O
Q2
C
OUT
V
OUT
0.1
μ
F
PV
CC2
1N5817
1N5817
1N5817
PV
CC1
V
IN
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