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參數(shù)資料
| 型號： | LTC3831IGN |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | 0.150 INCH, PLASTIC, SSOP-16 |
| 文件頁數(shù)： | 3/20頁 |
| 文件大?。?/td> | 208K |
| 代理商： | LTC3831IGN |
LTC3831
11
3831fb
APPLICATIONS INFORMATION
controller feedback loop. As a result, the loop crossover
frequency increases and it may cause the feedback loop
to be unstable if the phase margin is insufcient.
To overcome this problem, the LTC3831 monitors the
peak voltage of the ramp signal and adjust the oscillator
charging current to maintain a constant ramp peak.
Input Supply Considerations/Charge Pump
The LTC3831 requires four supply voltages to operate: VIN
for the main power input, PVCC1 and PVCC2 for MOSFET
gate drive and a clean, low ripple VCC for the LTC3831
internal circuitry (Figure 5).
In many applications, VCC can be powered from VIN
through an RC lter. This supply can be as low as 3V. The
low quiescent current (typically 800μA) allows the use
of relatively large lter resistors and correspondingly
small lter capacitors. 100Ω and 4.7μF usually provide
adequate ltering for VCC. For best performance, connect
the 4.7μF bypass capacitor as close to the LTC3831 VCC
pin as possible.
Gate drive for the top N-channel MOSFET Q1 is supplied
from PVCC1.ThissupplymustbeaboveVIN(themainpower
supply input) by at least one power MOSFET VGS(ON) for
efcient operation. An internal level shifter allows PVCC1to
operate at voltages above VCCandVIN,upto14Vmaximum.
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
PVCC2.ThissupplyonlyneedtobeabovethepowerMOSFET
VGS(ON) for efcient operation. PVCC2 can also be driven
from the same supply/charge pump for the PVCC1, or it can
be connected to a lower supply to improve efciency.
Figure 6 shows a doubling charge pump circuit that can be
used to provide 2VIN gate drive for Q1. The charge pump
consists of a Schottky diode from VIN to PVCC1 and a 0.1μF
capacitor from PVCC1 to the switching node at the drain of
Q2. This circuit provides 2VIN – VF to PVCC1 while Q1 is
ON and VIN – VF while Q1 is OFF where VF is the forward
voltage of the Schottky diode. Ringing at the drain of Q2
can cause transients above 2VIN at PVCC1; if VIN is higher
Figure 4. External Synchronization Operation
Figure 6. Doubling Charge Pump
Figure 5. Supplies Input
SHDN
200kHz
FREE RUNNING
RAMP SIGNAL
TRADITIONAL
SYNC METHOD
WITH EARLY
RAMP
TERMINATION
LTC3831
KEEPS RAMP
AMPLITUDE
CONSTANT
UNDER SYNC
RAMP SIGNAL
WITH EXT SYNC
RAMP AMPLITUDE
ADJUSTED
3831 F04
3831 F05
+
VCC
PVCC2
PVCC1
VIN
TG
Q1
COUT
VOUT
Q2
LO
BG
INTERNAL
CIRCUITRY
LTC3831
3831 F06a
+
DZ
12V
1N5242
Q1
LO
Q2
COUT
VOUT
0.1μF
PVCC2
OPTIONAL
USE FOR VIN ≥ 7V
MBR0530T1
PVCC1
TG
BG
VIN
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