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參數(shù)資料
| 型號： | LLT3837EFE |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 110 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | 4.40 MM, PLASTIC, TSSOP-16 |
| 文件頁數(shù)： | 18/28頁 |
| 文件大?。?/td> | 255K |
| 代理商： | LLT3837EFE |
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LT3837
25
3837fa
APPLICATIONS INFORMATION
PC Board Layout Considerations
In order to minimize switching noise and improve output
load regulation, connect the GND pin of the LT3837 directly
to the ground terminal of the VCC decoupling capacitor,
the bottom terminal of the current sense resistor, the
ground terminal of the input capacitor, and the ground
plane (multiple vias). Place the VCC capacitor immediately
adjacent to the VCC and GND pins on the IC package. This
capacitor carries high di/dt MOSFET gate drive currents.
Use a low ESR ceramic capacitor.
Take care in PCB layout to keep the traces that conduct high
switching currents short, wide and with minimal overall
loop area. These are typically the traces associated with
the switches. This reduces the parasitic inductance and
also minimizes magnetic eld radiation. Figure 9 outlines
the critical paths.
Keep electric eld radiation low by minimizing the length
and area of traces (keep stray capacitances low). The drain
of the primary side MOSFET is the worst offender in this
category. Always use a ground plane under the switcher
circuitry to prevent coupling between PCB planes.
Check that the maximum BVDSS ratings of the MOSFETs
are not exceeded due to inductive ringing. This is done by
viewing the MOSFET node voltages with an oscilloscope. If
it is breaking down either choose a higher voltage device,
add a snubber or specify an avalanche-rated MOSFET.
Place the small-signal components away from high fre-
quency switching nodes. This allows the use of a pseudo-
Kelvin connection for the signal ground, where high di/dt
gate driver currents ow out of the IC ground pin in one
direction (to the bottom plate of the VCC decoupling
capacitor) and small-signal currents ow in the other
direction.
Keep the trace from the feedback divider tap to the FB
short to preclude inadvertent pickup.
For applications with multiple switching power converters
connected to the same input supply, make sure that the
input lter capacitor for the LTC3837 is not shared with
other converters. AC input current from another converter
could cause substantial input voltage ripple and this could
interfere with the LT3837 operation. A few inches of PC
trace or wire (L
100nH) between the CIN of the LT3837
and the actual source VIN is sufcient to prevent current
sharing problems.
Figure 9. High Current Paths
T2
T1
CR
CVIN
MS
MP
GATE
TURN-ON
GATE
TURN-ON
RSENSE
CVCC
SG
VCC
GND
LT3825
PG
VCC
VIN
GND
LT3825
GATE
TURN-OFF
GATE
TURN-OFF
Q4
Q3
COUT
3837 F09
OUT
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