RT8056 Просмотр технического описания (PDF) - Richtek Technology
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RT8056 Datasheet PDF : 11 Pages
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RT8056
Typical Application Circuit
VIN
2.8V to 5.5V
L1
LX1 6 2.2µH
3 VIN
R1
CIN
FB1 5
10µF
RT8056
R2
L2
LX2 10 2.2µH
7 EN1
R3
Chip Enable
9 EN2
FB2 1
8,
R4
GND 11 (Exposed Pad)
VOUT1
COUT1
22µF
VOUT1
=
0.6V
x
⎛
⎜⎝1
+
R1 ⎞
R2 ⎟⎠
⎛ R3 ⎞
VOUT2 = 0.6V x ⎜⎝1+ R4 ⎟⎠
VOUT2
COUT2
22µF
Function Pin Description
Pin No.
Pin Name
Pin Function
1
FB2
Feedback Input of Channel 2.
2, 4
NC
No Internal Connection.
3
VIN
Power Supply Input of Channel 1 & Channel 2.
5
FB1
Feedback Input of Channel 1.
6
LX1
Switching Node of Channel 1.
7
EN1
8,
11 (Exposed Pad)
GND
Chip Enable of Channel 1 (Active High).
Ground. The Exposed Pad must be soldered to a large PCB and connected to GND
for maximum power dissipation.
9
EN2
Chip Enable of Channel 2 (Active High).
10
LX2
Switching Node of Channel 2.
Function Block Diagram
EN1/EN2
FB1/FB2
Slope
Compensation
Error
Amplifier
RC
COMP
OSC &
Shutdown
Control
Current
Sense
PWM
Comparator
UVLO &
Power Good
Detector
VREF
Current
Limit
Detector
Control
Logic
Driver
VIN
RS1
LX1/LX2
RS2
GND
www.richtek.com
2
DS8056-02 April 2011
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