SI9122 Datasheet, PDF (7/17 Pages) Vishay Siliconix – 500-kHz Half-Bridge DC-DC Converter With Integrated Secondary Synchronous Rectification Drivers

Si9122
Vishay Siliconix
PIN CONFIGURATION
V_IN
REG_COMP
V_CC
V_REF
GND
R_OSC
EP
V_INDET
CS1
CS2
Si9122DQ (TSSOP-20)
1
20
2
19
3
18
4
17
5
16
6
15
7
14
8
13
9
12
10
11
Top View
BST
D_H
L_X
D_L
PGND
SR_H
SR_L
SS
BBM
C_{L_CONT}
Si9122DLP (MLP65-20)
V_IN
1
20
REG_COMP
2
19
V_CC
3
18
V_REF
4
17
GND
5
16
R_OSC
6
15
EP
7
14
V_INDET
8
13
CS1
9
12
CS2
10
11
Top View
Standard
Part Number
Si9122DQ-T1
ORDERING INFORMATION
Lead (P_b)-Free
Part Number Temperature Range
Si9122DQ-T1—E3
Si9122DLP-T1—E3
−40 to 85_C
Package
TSSOP-20
MLP65-20
Eval Kit
Si9122DB
Issue 3
Temperature Range
−10 to 70_C
Board Type
Surface Mount and
Thru-Hole
BST
D_H
L_X
D_L
PGND
SR_H
SR_L
SS
BBM
C_{L_CONT}
PIN DESCRIPTION
Pin Number
Name
1
V_IN
2
REG_COMP
3
V_CC
4
V_REF
5
GND
6
R_OSC
7
EP
8
V_INDET
9
CS1
10
CS2
11
C_{L_CONT}
12
BBM
13
SS
14
SR_L
15
SR_H
16
PGND
17
D_L
18
L_X
19
D_H
20
BST
Function
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_IN under voltage detect and shutdown function input. Shuts down or disables switching when V_INDET falls below
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
Document Number: 71815
S-41944—Rev. F, 18-Oct-04
www.vishay.com
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