SI9124 Datasheet, PDF (7/16 Pages) Vishay Siliconix – 500-kHz Push-Pull DC-DC Converter With Integrated Secondary Synchronous Rectification Control

PIN CONFIGURATION
New Product
Si9124
Vishay Siliconix
V_IN
V_CC
V_REF
GND
R_OSC
EP
V_INDET
CS1
Si9124DQ (TSSOP-16)
1
16
2
15
3
14
4
13
5
12
6
11
7
10
8
9
Top View
V_CC2
OUT_A
PGND₂
OUT_B
PGND
SEC_SYNC
SS
CS2
ORDERING INFORMATION
Part Number Temperature Range
Package
Si9124DQ-T1
Si9124DQ
- 40 to 85_C
Tape and Reel
Bulk
PIN DESCRIPTION
Pin Number
Name
1
V_IN
2
V_CC
3
V_REF
4
GND
5
R_OSC
6
EP
7
V_INDET
8
CS1
9
CS2
10
SS
11
SEC_SYNC
12
PGND
13
OUT_B
14
PGND₂
15
OUT_A
16
V_CC2
Function
Input supply voltage for the start-up circuit.
Supply voltage for internal circuitry
3.3-V reference, decoupled with 1-mF capacitor
Analog 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
Soft-Start control - external capacitor connection
Secondary side timing signal
A driver power ground.
B gate drive signal – primary
B driver power ground
A gate drive signal – primary
V_CC2 connect to V_CC
Document Number: 72099
S-03638—Rev. B, 20-Mar-03
www.vishay.com
7