IRS2453DSPBF International Rectifier, IRS2453DSPBF Datasheet - Page 13

• Manufacturer Part Number: IRS2453DSPBF
• Description: IC DRIVER FULL SELF OSC 14-SOIC
• Manufacturer: International Rectifier

Specifications of IRS2453DSPBF

• Configuration: High and Low Side, Synchronous
• Input Type: Self Oscillating
• Current - Peak: 180mA
• Number Of Configurations: 1
• Number Of Outputs: 4
• High Side Voltage - Max (bootstrap): 600V
• Voltage - Supply: 10 V ~ 16.6 V
• Operating Temperature: -25°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 14-SOIC (3.9mm Width), 14-SOL
• Package: 14-lead SOIC
• Circuit: HID Ballast IC
• Offset Voltage (v): 600
• Output Source Current Min (ma): 190
• Output Sink Current Min (ma): 440
• Vcc Range (v): 10-20V with UVLO
• Output Voltage Min (v): 10
• Output Voltage Max (v): 20
• Delay Matching Max (ns): 50
• Pbf: Yes
• T Off (ns): 150
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Delay Time: -

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Functional Description
Under-Voltage Lock-Out Mode (UVLO)
The under-voltage lockout mode (UVLO) is defined as the state the IC is in when V
threshold of the IC. The IRS2453(1)D under-voltage lock-out is designed to maintain an ultra low supply current
of less than 150 μA, and to guarantee the IC is fully functional before the high and low side output drivers are
activated. During under-voltage lock-out mode, the high and low side driver outputs LO1, LO2, HO1, HO2 are all
low. With V
Normal Operating Mode
Once V
(V
established by an internal resistor ladder, LO1 and HO2 turn on with a delay equivalent to the deadtime (t
Once the CT voltage reaches V
approximately ground (V
end of the deadtime, LO2 and HO1 go high. Once the CT voltage reaches V
to high again, the deadtime is activated. At the end of the deadtime, LO1 and HO2 go high and the cycle starts
over again.
The frequency is best determined by the graph, Frequency vs. RT, page 3, for different values of CT. A first
order approximate of the oscillator frequency can also be calculated by the following formula::
This equation can vary slightly from actual measurements due to internal comparator over- and under-shoot
delays.
Bootstrap MOSFET
The internal bootstrap FET and supply capacitor (C
circuitry. The internal boostrap FET only turns on when the corresponding LO is high. To guarantee that the
high-side supply is charged up before the first pulse on HO1 and HO2, LO1 and LO2 are both on when CT
ramps between zero and 1/3*V
the bootstrap capacitor is charged when CT is brought back over 1/3*V
Non-Latched Shutdown
If CT is pulled down below V CTSD (approximately 1/6 of V
oscillation stops. All outputs are held low and the bootstrap FETs are off. Oscillation will resume once CT is able
to charge up again to V
Latched Shutdown
When the SD pin is brought above 2 V, the IC goes into fault mode and all outputs are low. V
recycled below V
appropriate external circuitry.
CC
-V
RT+
CC
) and the external CT capacitor starts charging. Once the CT voltage reaches V
reaches the start-up threshold V
CC
above the V
CCUV-
to restart the IC. The SD pin can be used for over-current or over-voltage protection using
CT-
RT-
.
CCUV+
), the CT capacitor starts discharging and the deadtime circuit is activated. At the
CC
threshold, the IC turns on and the output begin to oscillate.
. LO1 and LO2 are also on when CT is grounded below 1/6*V
CT+
HO1
LO1
(approximately 2/3 of V
CCUV+
Deadtime Waveform
td_HO1
f
50%
≈
, the MOSFET M1 opens, RT increases to approximately V
. 1
50%
453
BOOT
13
×
50%
1
) comprise the supply voltage for the high side driver
RT
50%
CC
td_LO1
×
) by an external circuit, CT doesn’t charge up and
CT
CC
ton_LO
), LO1 and HO2 go low, RT goes down to
CC
50%
.
CT-
, LO2 and HO1 go low, RT goes
IRS2453(1)D(S)
© 2007 International Rectifier
CC
CT-
is below the turn-on
(about 1/3 of V
CC
to ensure that
CC
has to be
CC
d
CC
),
).