IRS27951S
IRS27952(4)S
RESONANT HALF-BRIDGE CONVERTER CONTROL IC
Features
Simple primary-side control solution for fixed and variable
frequency DC-DC resonant converters.
Max 500kHz per channel output with 50% duty cycle
Floating channel bootstrap operation up to +600Vdc
Programmable minimum and maximum switching frequency
Programmable soft start frequency and soft start time
Programmable dead time
Micropower start-up & ultra low quiescent current
Over-current protection using low side MOSFET Rds(on)
User initiated micropower “Sleep mode”
Under-voltage Lockout
Simple design with minimal component count.
Lead-free
Product Summary
Topology
V
OFFSET
V
OUT
I
O+
& I
O-
(typical)
Dead-time
(programmable)
Half-Bridge
600 V
V
CC
300 mA & 900 mA
200ns~2us
Package Options
Typical Application
LCD & PDP TV
Telecom SMPS, PC SMPS
Home Audio Systems
IRS27951S/IRS27952S
14-lead SOIC
IRS279524S
Ordering Information
Standard Pack
Base Part Number
Package Type
Form
IRS27951
SOIC8N
Tube/Bulk
Tape and Reel
IRS27952
SOIC8N
Tube/Bulk
Tape and Reel
IRS279524
SOIC14N
Tube/Bulk
Tape and Reel
Quantity
95
2500
95
2500
55
2500
IRS27951SPBF
IRS27951STRPBF
IRS27952SPBF
IRS27952STRPBF
IRS279524SPBF
IRS279524STRPBF
Complete Part Number
1
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IRS27951S
IRS27952(4)S
Typical Application Diagram
DC BUS
VIN
R1
R2
Rcc
Dbs
U1
VCC
RT
CT/SD
COM
VB
HO
VS
LO
D3
Cbs
8
7
6
5
1
M1
Rg1
D1
CDC
2
3
4
Lr
M2
Rg2
Dss
Rss
RT
IRS2795
Rmax
CT
Css
Cr
RTN
COUT
D2
LOAD
Rled
Rbias
Cf1
U2
Cf2
Rf2
Rs1
U3
TL431
Rs2
2
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IRS27951S
IRS27952(4)S
Table of Contents
Ordering Information
Typical Application Diagram
Absolute Maximum Ratings
Recommended Operating Conditions
Electrical Characteristics
Functional Block Diagram
Input/Output Pin Equivalent Circuit Diagram
Lead Definitions
Lead Assignments
State Diagram
Application Information and Additional Details
Package Details
Tape and Reel Details
Part Marking Information
Qualification Information
Page
1
2
5
5
6
8
9
10
10
12
13
23
25
27
28
3
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IRS27951S
IRS27952(4)S
Description
The IRS2795(1,2)(4) is a self oscillating half-bridge driver IC for DC-DC resonant converter applications, especially
the LLC resonant half-bridge converter. The frequency and dead time can be programmed externally using two
external components. The IC offers over current protection using the on state resistance of the low-side MOSFET.
The IC can be disabled by externally pulling the voltage at the CT/SD pin below its enable voltage threshold
4
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IRS27951S
IRS27952(4)S
Absolute Maximum Ratings
Absolute maximum ratings indicate sustained limits beyond which damage to the device may occur. All voltage
parameters are absolute voltages referenced to COM, all currents are defined positive into any lead. The thermal
resistance and power dissipation ratings are measured under board mounted and still air conditions.
Symbol
Definition
Supply Voltage
High-side Floating Supply Voltage
High-side Floating Supply Offset Voltage
High-side Floating Output Voltage
Low-side Output Voltage
CT/SD Pin Voltage
RT Pin Voltage
RT pin source current
Allowable offset voltage slew rate
Operating Junction Temperature
Storage Temperature
Package power dissipation @ TA ≤
25°C
Thermal resistance, junction to
ambient
Min.
Max.
Units
V
CC
V
B
V
S
V
HO
V
LO
V
CT
V
RT
I
RT
dV
s
/dt
T
J
T
S
P
D
Rth
JA
(8 lead SOIC)
(14 lead SOIC)
(8 lead SOIC)
(14 lead SOIC)
-0.3
-0.3
V
B
– 25
V
S
– 0.3
-0.3
-0.3
-0.3
---
-50
-40
-55
—
—
—
—
25
625
V
B
+ 0.3
V
B
+ 0.3
V
CC
+ 0.3
V
CC
+ 0.3
V
CC
+ 0.3
2
50
150
150
0.833
1.04
150
120
V
mA
V/ns
°C
W
°C/W
Recommended Operating Conditions
For proper operation the device should be used within the recommended conditions.
Symbol
Definition
Min.
Max.
Units
V
BS
High-side floating supply voltage
10
Vcc
†
V
S
Steady-state high-side floating supply offset voltage
600
V
-3.0
V
CC
Supply voltage
12
18
fsw
Switching Frequency
---
500
kHz
†
Care should be taken to avoid output switching conditions where the V S node flies inductively below ground by
more than 5 V.
Recommended Component Values
Symbol
R
RT
C
CT
Component
RT pin resistor value
CT pin capacitor value
Min.
2
200
Max.
100
2000
Units
k
pF
5
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August 27, 2015
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