SI9122E Datasheet, PDF (7/20 Pages) Vishay Siliconix – 500-kHz Half-Bridge DC/DC Controller with Integrated Secondary Synchronous Rectification Drivers

PIN CONFIGURATION
V_IN
REG_COMP
V_CC
V_REF
GND
R_OSC
EP
V_INDET
CS1
CS2
Si9122EDQ (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
DH
LX
DL
PGND
SR_H
SR_L
SS
BBM
C_{L_CONT}
Si9122E
Vishay Siliconix
Si9122EDLP (MLP65-20)
V_IN
1
2
REG_COMP
3
V_CC
4
V_REF
5
GND
6
R_OSC
7
8
EP
9
V_INDET
10
CS1
CS2
20
19
18
17
16
15
14
13
12
11
Top View
BST
DH
LX
DL
PGND
SR_H
SR_L
SS
BBM
C_{L_CONT}
ORDERING INFORMATION
Part Number
Si9122EDQ-T1-E3
Si9122EDLP-T1-E3
Eval Board
Contact Factory
Temperature Range
- 40 °C to 85 °C
Temperature Range
- 10 °C to 70 °C
Package
TSSOP-20
MLP65-20
Board Type
Surface Mount and Thru-Hole
PIN DESCRIPTION
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
DL
18
LX
19
DH
20
BST
Input supply voltage for the start-up circuit
Control signal for an external pass transistor
Supply voltage for internal circuitry
3.3 V reference
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: 73866
S-80112-Rev. D, 21-Jan-08
www.vishay.com
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