SI9122 Vishay Siliconix, SI9122 Datasheet - Page 7

• Manufacturer Part Number: SI9122
• Description: 500-kHz Half-Bridge DC-DC Converter With Integrated Secondary Synchronous Rectification Drivers
• Manufacturer: Vishay Siliconix

Document Number: 71815
S-41944—Rev. F, 18-Oct-04
PIN CONFIGURATION
PIN DESCRIPTION
Pin Number
REG_COMP
10
12
13
14
15
16
17
18
19
20
11
1
2
3
4
5
6
7
8
9
V
R
INDET
V
GND
CS1
CS2
V
OSC
REF
V
EP
CC
IN
REG_COMP
Si9122DQ (TSSOP-20)
C
Name
1
2
3
4
5
6
7
8
9
10
V
PGND
R
L_CONT
V
GND
BBM
CS1
CS2
SR
BST
V
INDET
SR
V
EP
SS
D
D
L
REF
OSC
CC
IN
X
L
H
L
H
Top View
Part Number
Si9122DQ-T1
Standard
Input supply voltage for the start-up circuit.
Control signal for an external pass transistor.
Supply voltage for internal circuitry
3.3-V reference, decoupled with 1-mF capacitor
Ground
External resistor connection to oscillator
Voltage control input
V
preset threshold voltages and provides the feed forward voltage.
Current limit amplifier negative input
Current limit amplifier positive input
Current limit compensation
Programmable Break-Before-Make time connection to an external resistor to set time delay
Soft-Start control − external capacitor connection
Signal transformer drive, sequenced with the primary side.
Signal transformer drive, sequenced with the primary side.
Power ground.
Low-side gate drive signal – primary
High-side source and transformer connection node
High-side gate drive signal – primary
Bootstrap voltage to drive the high-side n-channel MOSFET switch
IN
Eval Kit
Si9122DB
under voltage detect and shutdown function input. Shuts down or disables switching when V
Issue 3
20
19
18
17
16
15
14
13
12
11
Lead (P
Si9122DQ-T1—E3
Si9122DLP-T1—E3
Part Number
ORDERING INFORMATION
BST
D
L
D
PGND
SR
SR
SS
BBM
C
X
H
L
L_CONT
H
L
Temperature Range
b
)-Free
−10 to 70_C
Temperature Range
REG_COMP
−40 to 85_C
40 to 85_C
V
Function
R
INDET
V
GND
CS1
CS2
V
OSC
REF
Surface Mount and
V
EP
CC
Board Type
IN
Thru-Hole
10
1
2
3
4
5
6
7
8
9
Si9122DLP (MLP65-20)
Package
TSSOP-20
Top View
MLP65-20
Vishay Siliconix
20
19
18
17
16
15
14
13
12
11
INDET
BST
D
L
D
PGND
SR
SR
SS
BBM
C
www.vishay.com
falls below
Si9122
X
H
L
L_CONT
H
L
7