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PDF IR2161S Data sheet ( Hoja de datos )
| Número de pieza | IR2161S | |
| Descripción | Halogen Converter Control IC | |
| Fabricantes | International Rectifier | |
| Logotipo |  |
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Data Sheet No. PD60219 rev C
IR2161(S) & (PbF)
HALOGEN CONVERTOR CONTROL IC
Features
• Intelligent half-bridge driver
• Auto Resetting Short Circuit Protection
• Auto Resetting Overload Protection
• Externally Triggerable Latching Shutdown
• Latching Overtemperature Protection
• Frequency Modulation dither (for lower EMI)
• Micropower Startup (<300 μA)
• Phase Cut dimmable for leading / trailing edge
• Output Voltage Shift Compensation.
• Real Softstart
• Adaptive Dead Time
• Small 8 Pin DIP/SOIC Package
• Also available LEAD-FREE (PbF)
Description
Packages
8-Lead PDIP
IR2161
8-Lead SOIC
IR2161S
The IR2161 is a dedicated Intelligent Half bridge Driver IC for a Halogen convertor (electronic transformer). It
includes all necessary protection features and also allows the Convertor to be dimmed externally with a
standard phase cut dimmer with both leading or trailing edge types. This IC provides the advantage of reduced
thermal stress in the lamp due to softstart. There is also compensation of the output voltage for load regulation.
It enables the convertor to operate with extremely low harmonic distortion over the full range of loads. The
IR2161 includes adaptive deadtime to allow cool running MOSFETs and improves the EMI behaviour due to
frequency modulation (dither). All the features are integrated in a small 8 pin DIP/SOIC package to allow for a
size reduction in the next generation of convertors.
Typical Connections
D1
LF
AC LINE
INPUT
CLF
RD
CD
D2
RS DCP1
DS
CVCC1
DCP2
DB
VCC 1
8 VB
Q1
CSNUB
COM
CVCC2
CSD
2
3
7 HO
6 VS
CB
T1
R1
VZ
CS 4
5 LO
Q2
C3 C4
C1
D3 D4
CSD CCS
RL
RCS
12VAC
OUTPUT
R2
C2
Note: Throughout this data sheet convertor is spelled in accordance with standard IEC 61047 DC or AC supplied convertors
for filament lamps Performance requirements.
www.irf.com
1
1 page  
IR2161(S) & (PbF)
Electrical Characteristics (cont.)
VCC = VBS = VBIAS = 14V, +/- 0.25V, VCSD = 5.0V, CLO =CHO = 1000 pF, and TA = 25°C unless otherwise specified.
Soft Start Characteristics
Symbol Definition
Min. Typ. Max. Units Test Conditions
ISS Soft start CSD charge current
fSS Soft start frequency
Gate Driver Output Characteristics
0.5 mA
115 kHz VCC>VCCUV+
Symbol Definition
VLO=LOW LO voltage when LO is low
VHO=LOW HO voltage when HO is low
VLO=HIGH LO voltage when LO is high
VHO=HIGH HO voltage when HO is high
tRISE
Turn-on rise time
tFALL
Turn-off fall time
IO+ HO, LO source current
IO- HO, LO sink current
Min.
—
—
—
—
—
—
—
—
Typ. Max.
COM
COM
VCC
VCC
110
60
200
300
—
—
—
—
250
140
—
—
Units Test Conditions
ns CHO=CLO=1nF
mA
Lead Definitions
Lead Assignments
Symbol
VCC
COM
CSD
CS
LO
VS
HO
VB
Description
Supply voltage
IC power and signal ground
Shutdown timing and compensation capacitor
Current sensing input
Low-side gate driver output
High-side floating return
High side gate driver output
High side gate driver floating supply
VCC 1
COM 2
CSD 3
CS 4
8 VB
7 HO
6 VS
5 LO
* Recommended value for CSD is 100nF (all performance data relates to this value)
NOTE: The recommended value for RL is 1K Ohm and CCS is 1nF.
www.irf.com
5
5 Page 
IR2161(S) & (PbF)
convertor is close to maximum load. If the load is reduced,
the average level at which the ripple occurs (i.e. the DC
component) will be at a lower level.
Shut Down Circuit
The IR2161 contains a dual mode auto-resetting shutdown
circuit that detects both a short circuit or overload condition
in the convertor. The load current detected at the CS pin is
used to sense these conditions. If the output of the convertor
is short-circuited, a very high current will flow in the half
bridge and the system must shut down within a few mains
half cycles, otherwise the MOSFETs will rapidly be destroyed
due to excessive junction temperature. The internal CS pin
has an internal threshold (VCSSC). There also exists a lower
threshold so that if the voltage exceeds this level for more
than 50mS, the system will shut down.
A delay is included to prevent false tripping either due to
lamp inrush current at switch on (this current is still higher
than normal with the soft start operation) or transient
currents that may occur if an external triac based phase
cut dimmer is being used.
There also exists a lower threshold (VCSOL), which has a
much longer delay before it shuts down the system. This
provides the overload protection if an excessive number of
lamps is connected to the output or the output is short-
circuited at the end of a length of cable that has sufficient
resistance to prevent the current from being large enough
to trip the short circuit protection. Also under this condition
there is an excessive current in the half bridge that is
sufficient to cause heating and eventual failure but over a
longer period of time. The threshold for overload shutdown
is approximately 50% above maximum load with a delay of
approximately 0.5s. These timings are based on a current
waveform that has a sinusoidal envelope and a high
frequency square wave component with 50% duty cycle.
Both shutdown modes are auto resetting, which allows the
oscillator to start again approximately 1.5s after shutting
down. This is so that if the fault condition is removed the
system can start operating normally again without the line
voltage having to be switched off and back on again. It also
provides a good indication of overload to the end user as all
the lamps connected to the system will flash on and off
continuously if too many are connected.
The shut down circuit also uses the external CSD capacitor for
its timing functions. When the 0.5V threshold (VCSOL) is ex-
ceeded at CS the CSD is internally disconnected from the voltage
compensation circuit and connected to the shutdown circuit.
www.irf.com
CS
1.2V
I_SC
12V
SQ
RQ
Enable Outputs
Shutdown Function
0.54V
I_OL
2.5V
Switch
CSD
Overload Function
4V I_RESET
Figure 8, Shut Down Circuit.
The oscillator operates at minimum frequency when the
CSD capacitor is required for shutdown circuit timing.
During soft start or run mode, if the 0.5V threshold (VCSOL)
is exceeded the IR2161 charges CSD rapidly to approxi-
mately 5V (VCSDOL).
When the voltage at the CS input is greater than 0.5V, the
CSD capacitor is charged by current source IOL and when
the short circuit threshold of 1.2V is exceeded it is charged
by ISC as well. If 1.2V is exceeded CSD will charge from 5V
(VCSDOL) to 12V (VCSDSD), in approximately 50ms. When
0.5V is exceeded but 1.2V is not, CSD charges from 5V
(VCSDOL) to 12V (VCSDSD) in approximately 0.5s. It should
be remembered that, the timing accounts for the fact that
high frequency pulses with approximately 50% duty cycle
and a sinusoidal envelope appear at the CS pin.
The values of ISC and IOL take into account that only at the
peak of the mains will the comparator outputs go high and
effectively the capacitor will be charged in steps each line
half cycle. Once VCSD reaches 12V (VCSDSD), VCSD
discharges down to 2.4V (VCSDRS) and the system starts
up again. If the fault mode is still present, CSD starts
charging again.
If a fault is detected but goes away before CSD reaches
12V (VCSDSD), then CSD will discharge to 2.4V (VCSDRS)
and then the system will revert to compensation mode
without interruption of the output.
Following a shutdown, when the system starts up again
after the delay, the CSD capacitor will be internally switched
back to the voltage compensation circuit. However, if the
fault is still present the system will switch CSD back to the
shutdown circuit again.
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet IR2161S.PDF ] | |
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