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SI786DRG датащи(PDF) 7 Page - Vishay Siliconix

номер детали SI786DRG
подробное описание детали  Dual-Output Power-Supply Controller
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производитель  VISHAY [Vishay Siliconix]
домашняя страница  http://www.vishay.com
Logo VISHAY - Vishay Siliconix

SI786DRG датащи(HTML) 7 Page - Vishay Siliconix

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Si786
Vishay Siliconix
Document Number: 70189
S-40807—Rev. J, 26-Apr-04
www.vishay.com
7
PIN DESCRIPTION AND ORDERING INFORMATION
CS3
FB3
SS3
SSOP-28
DH3
ON3
LX3
D1
BST3
D2
VH
Q2
DL3
V+
VL
Top View
25
26
27
28
2
3
4
1
22
23
24
5
6
7
Q1
FB5
GND
PGND
REF
DL5
SYNC
BST5
SHDN
ON5
SS5
LX5
DH5
CS5
18
19
20
21
9
10
11
8
15
16
17
12
13
14
PIN DESCRIPTION
Pin
Symbol
Description
1
CS3
Current-sense input for 3.3-V Buck controller—this pins over current threshold is 100 mV with respect to FB3.
2
SS3
Soft-start input for 3.3 V. Connect capacitor from SS3 to GND.
3
ON3
ON/OFF logic input disables the 3.3-V Buck controller. Connect directly to VL for automatic turn-on.
4
D1
Comparator #1 noninverting input, threshold = 1.650 V. Comparator #1 output = Q1. Connect to GND if unused.
5
D2
Comparator #2 noninverting input (see D1).
6
VH
External bias supply-voltage input for comparators #1 and #2.
7
Q2
Comparator #2 output. Sources 20 mA from VH when D2 is high. Sinks 500 mA to GND when D2 is low regardless of VH input
voltage.
8
Q1
Comparator #1 output (see Q2).
9
GND
Analog ground.
10
REF
3.3-V reference output. Supplies external loads up to 5 mA.
11
SYNC
Oscillator control/synchronization input. Connect capacitor to GND, 1-mF/mA output or 0.22 mF minimum. For external clock
synchronization, a rising edge starts a new cycle to start. To use internal 200-kHz oscillator, connect to VL or GND. For
300-kHz oscillator, connect to REF.
12
SHDN
Shutdown logic input, active low. Connect to VL for automatic turn-on. The 5-V VL supply will not be disabled in shutdown allow-
ing connection to SHDN.
13
ON5
ON/OFF logic input disables the 5-V Buck Controller. Connect to VL for automatic turn-on.
14
SS5
Soft-start control input for 5 V Buck controller. Connect capacitor from SS5 to GND.
15
CS5
Current-sense input for 5 V Buck controller—this pins over current threshold is 100 mV referenced to FB3.
16
DH5
Gate-drive output for the 5-V supply high-side n-channel MOSFET.
17
LX5
Inductor connection for the 5-V supply.
18
BST5
Boost capacitor connection for the 5-V supply.
19
DL5
Gate-drive output for the 5-V supply rectifying n-channel MOSFET.
20
PGND
Power Ground.
21
FB5
Feedback input for the 5-V Buck controller.
22
VL
5-V logic supply voltage for internal circuitry—able to source 5-mA external loads. VL remains on with valid voltage at V+.
23
V+
Supply voltage input.
24
DL3
Gate-drive output for the 3.3-V supply rectifying n-channel MOSFET.
25
BST3
Boost capacitor connection for the 3.3-V supply.
26
LX3
Inductor connection for the 3.3-V supply.
27
DH3
Gate-drive output for the 3.3-V supply high-side n-channel MOSFET.
28
FB3
Feedback input for the 3.3-V Buck controller.


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