IRS2530DPBF International Rectifier, IRS2530DPBF Datasheet - Page 17

• Manufacturer Part Number: IRS2530DPBF
• Description: IC CTRL BALLAST DIMMING 8-DIP
• Manufacturer: International Rectifier
• Series: DIM8™r
• Type: Ballast Controllerr

Specifications of IRS2530DPBF

• Frequency: 34.2 ~ 115 kHz
• Current - Supply: 5mA
• Current - Output: 260mA
• Voltage - Supply: 12.5 V ~ 15.6 V
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 8-DIP (0.300", 7.62mm)
• Rohs Compliant: Yes
• Peak Reflow Compatible (260 C): Yes
• Supply Current: 5mA
• Driver Case Style: DIP
• No. Of Pins: 8
• Operating Temperature Range: -40°C To +125°C
• Leaded Process Compatible: Yes
• For Use With: IRPLDIM5E - KIT DES BALLAST 4LEVEL DIM FLUORIRPLDIM4E - KIT DES BALLAST 26W IRS2530DIRPLCFL8U - KIT DES FLUOR BALLAST IRS2530D
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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Component Selection
Proper design of the circuit schematic (see Typical Application Diagram, Page 1) and component selection is
important for achieving proper ballast functionality and preventing problems. The following design procedure
should be followed for determining the various programming and filtering component values:
1) Capacitor CPH programs the desired preheat/ignition time. CPH is charged up by an internal 1 μA
2) Capacitor CVCO programs the speed of the dimming feedback loop. To ensure smooth and stable
3) Resistor RVCO and capacitor CPH provide additional compensation of the dimming loop to prevent
4) Resistor RCS measures the lamp current for dimming. RCS should be kept small to minimize power
5) The additional feedback components include RFB for current limiting and noise filtering, CFB for DC
6) Capacitors CVCC2 and CBS are the low-side and high-side supply capacitors for maintaining their
current source at the VCO pin. The value of CPH is determined by:
dimming, CVCO should be small enough such that the dimming loop reacts to lamp current changes
each switching cycle. The value of CVCO is typically fixed for most lamp types and is given as:
the VCO voltage from changing too much over a given switching cycle. The value of RVCO is
typically fixed for most lamp types and is given as:
losses but the peak voltage across RCS at the lowest lamp current dimming level should be above a
minimum level to avoid noise problems. Using the minimum rms lamp current during dimming, a
minimum allowable peak voltage level across RCS of 100 mV, and an additional factor of 5 (signal
attenuation due to RFB and CDIM), the value of RCS is determined by:
blocking, and CDIM for noise filtering. The value of these components are typically fixed for most
lamp types and are given as:
respective supply voltages and providing high-frequency noise filtering. These capacitors are
typically fixed and are given as:
Using the maximum rms lamp current, the power loss in resistor RCS is then determined by:
C
P
LOSS
PH
R
=
CS
_
RCS
I
=
VCO
C
V
I
=
VCC
C
VCOFLT
LAMP
C
R
C
⋅
(
VCO
R
VCO
t
DIM
FB
I
PH
2
FB
LAMP
100
_
=
=
/
17
=
=
RMS
IGN
= k
=
C
0
1
2
_
1
10
mV
1 .
BS
5 .
2 .
RMS
_
=
MIN
μ
Ω
k
nF
nF
=
Ω
F
1
_
μ
MAX
0
⋅
A
1 .
⋅
2
μ
4
)
t
V
2
F
PH
×
×
5
/
R
IGN
CS
© 2008 International Rectifier
IRS2530D(S)