IR2156
(S)&(PbF)
Block Diagram
Vcc
S1
RT
S2
40K
CT
RDT
2.5K
S3
S4
R
RPH
ICPH
CPH
5.1V
5.1V
VDC
RVDC
10K
R
Schmitt 1
Fault
Logic
S
R1
R2 Q
CS
1.3V
SD
5.1V
Comp 2
COM
Under-
Voltage
Detect
Comp 3
Q
Low-
Side
Driver
LO
S6
V
TH
R
Soft
Start
R
Comp 1
T
R
Q
Q
VS
R
Driver
Logic
VB
High-
Side
Driver
HO
Lead Assignments & Definitions
Pin Assignments
NC
VCC
VDC
RT
RPH
CT
1
2
14 VB
13 HO
Pin # Symbol
1
2
3
4
5
6
7
8
9
10
11
12
13
14
NC
VCC
VDC
RT
RPH
CT
CPH
COM
SD
CS
LO
VS
HO
VB
Description
No connect
Logic & low-side gate driver supply
IC start-up and DC bus sensing Input
Minimum frequency timing resistor
Preheat frequency timing resistor
Oscillator timing capacitor
Preheat timing capacitor
IC power & signal ground
Shutdown input
Current sensing input
Low-side gate driver output
High-side floating return
High-side gate driver output
High-side gate driver floating supply
IR2156
3
4
5
6
12 VS
11 LO
10 CS
9 SD
8 COM
CPH 7
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