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PDF IRS27952S Data sheet ( Hoja de datos )
| Número de pieza | IRS27952S | |
| Descripción | RESONANT HALF-BRIDGE CONVERTER CONTROL IC | |
| Fabricantes | International Rectifier | |
| Logotipo |  |
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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
VOFFSET
VOUT
IO+ & IO- (typical)
Dead-time
(programmable)
Package Options
Typical Application
• LCD & PDP TV
• Telecom SMPS, PC SMPS
• Home Audio Systems
IRS27951S/IRS27952S
Half-Bridge
600 V
VCC
300 mA & 900 mA
200ns~2us
14-lead SOIC
IRS279524S
Ordering Information
Base Part Number
Package Type
IRS27951
SOIC8N
IRS27952
SOIC8N
IRS279524
SOIC14N
Standard Pack
Form
Quantity
Tube/Bulk
95
Tape and Reel
2500
Tube/Bulk
95
Tape and Reel
2500
Tube/Bulk
55
Tape and Reel
2500
Complete Part Number
IRS27951SPBF
IRS27951STRPBF
IRS27952SPBF
IRS27952STRPBF
IRS279524SPBF
IRS279524STRPBF
1 www.irf.com © 2012 International Rectifier
November 8th, 2012
Free Datasheet http://www.datasheet4u.com/
1 page  
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
VCC
VB
VS
VHO
VLO
VCT
VRT
IRT
dVs/dt
TJ
TS
PD
RthJA
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
(8 lead SOIC)
(14 lead SOIC)
Thermal resistance, junction to
(8 lead SOIC)
ambient
(14 lead SOIC)
Min.
-0.3
-0.3
VB – 25
VS – 0.3
-0.3
-0.3
-0.3
---
-50
-40
-55
—
—
—
—
Max.
25
625
VB + 0.3
VB + 0.3
VCC + 0.3
VCC + 0.3
VCC + 0.3
2
50
150
150
0.833
1.04
150
120
Units
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
VBS High-side floating supply voltage
VS Steady-state high-side floating supply offset voltage
10
†
-3.0
Vcc
600 V
VCC Supply voltage
12 18
fsw Switching Frequency
--- 500 kHz
† Care should be taken to avoid output switching conditions where the VS node flies inductively below ground by
more than 5 V.
Recommended Component Values
Symbol
RRT
CCT
Component
RT pin resistor value
CT pin capacitor value
Min.
2
200
Max.
100
2000
Units
kΩ
pF
5 www.irf.com © 2012 International Rectifier
November 8th, 2012
Free Datasheet http://www.datasheet4u.com/
5 Page 
IRS27951S
IRS27952(4)S
VCC: Power Supply Voltage
This is the supply voltage pin of the IC and sense node for the under-voltage lock out circuit. It is possible to turn off
the IC by pulling this pin below the minimum turn off threshold voltage, VCCUV- without damage to the IC. This pin is
not internally clamped.
RT: Oscillator timing resistor
This pin provides a precise 2V reference and a resistor connected from this pin to COM defines a current that is
used to set the minimum oscillator frequency. To close the feedback loop that regulates the converter output
voltage by modulating the oscillator frequency, the phototransistor of an optocoupler will be connected to this pin
through a resistor. The value of this resistor will set the maximum operating frequency. An R-C series connected
from this pin to COM sets frequency shift at start-up to prevent excessive energy inrush (soft-start).
CT/SD: Oscillator timing capacitor /Shutdown
An external capacitor CT from this pin to COM sets the dead time and frequency of the oscillator. The CT pin has
sawtooth waveform, which is charged up by the current reference programmed at RT pin during rising slope and is
discharged by an internal fixed 2mA current source during the falling slope. The falling time of the sawtooth defines
the dead-time.
At start-up, a 10uA current source charges this capacitor and the oscillator is enabled only when the voltage at this
pin exceeds VEN1. The IC can also be used to enter sleep mode by externally pulling this pin below VEN2.
COM: Logic and Gate drive Ground
This is ground potential pin of the integrated control circuit. All internal circuits are referenced to this point.
LO: Low-side Gate Drive Output
The driver is capable of 0.3A source and 0.9A sink peak current to drive the lower MOSFET of the half-bridge leg.
The pin is actively pulled to GND during UVLO.
VS: High Side Gate Return/Current Sense
This is the floating supply return. This pin also acts as a high voltage current sense pin and uses the low-side
MOSFET RDSON to detect an over current fault condition.
HO: High-side Gate Drive
The driver is capable of 0.3A source and 0.9A sink peak current to drive the high-side MOSFET in the half-bridge. A
resistor internally connected to pin VS ensures that the pin is not floating during UVLO.
VB: High Side floating supply voltage
The bootstrap capacitor connected between this pin and VS is charged by the bootstrap diode when the low-side
gate-drive is high.
11 www.irf.com © 2012 International Rectifier
November 8th, 2012
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
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