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IR2157-IR21571-IR21571S-IR21571STR-IR2157S
Ballast Control, Below Resonance Protection, Thermal Overload Protection, Protection from Failure to Strike, Programmable Preheat Time and Run Frequency, Programmable Deadtime in a 16-pin DIP package
Data Sheet PD No. 60179 revM
International Not recommended for new design:
please use IRS21571 D
Titat Rectifier lR21571(S)&(PbF)
FULLY INTEGRATED BALLAST CONTROL IC
Features
q Programmable preheattime &frequency . Thermal overload protection
q Programmable ignition ramp . Programmable deadtime
q Protection from failure-to-strike q Integrated 600V level-shifting gate driver
q Lamp filament sensing & protection . Internal 15.6V zener clamp diode on VCC
q Protection from operation below resonance - o Micropower startup (150uA)
0.2V CS threshold sync'd to falling edge on LO . Latch immunity protection on all leads
q Protection from low-line condition . ESD protection on all leads
q Automatic restart for lamp exchange . Parts also available LEAD-FREE
. . Packa es
Description g
The IR21571 is a fully integrated, fully protected 600V ballast control IC designed
to drive virtually all types of rapid start fluorescent lamp ballasts. Externally pro-
grammable features such as preheat time & frequency, ignition ramp characteris- ’ au''
tics, and running mode operating frequency provide a high degree of flexibility for 16 Lead SOIC
the ballast design engineer. Comprehensive protection features such as protec-
tion from failure of a lamp to strike, filament failures, low dc bus conditions, thermal
overload, or lamp failure during normal operation, as well as an automatic restart
function, have been included in the design. The heart of this control IC is a variable
frequency oscillator with externally programmable deadtime. Precise control of a
50% duty cycle is accomplished using a T-flip-flop. The IR21571 is available in both
16 pin DIP and 16 pin narrow body SOIC packages.
16 Lead PDIP
Typical Connection
+ Rectified AC Line
+ VBUS
CELOCK Lees
Fw, CSNUBBER A
A D2 CRES
aj. R5
V8le return
1
IR21571(S)&(PbF)
Absolute Maximum Ratings
International
TOR Rectifier
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 Min. Max. Units
VB High side floating supply voltage -O.3 625
Vs High side floating supply offset voltage VB - 25 Vs + 0.3 V
VH0 High side floating output voltage Vs - 0.3 VB + 0.3
VLO Low side output voltage -O.3 Vcc + 0.3
IOMAX Maximum allowable output current (either output) due to
external power transistor miller effect -500 500
IRT RT pin current -5 5
VCT CT pin voltage -0.3 5.5
Va, VDC pin voltage -O.3 Vcc + 0.3 V
ICpH CPH pin current -5 5
lRpH RPH pin current -5 5
IRUN RUN pin current -5 5 mA
IDT Deadtime pin current -5 5
Vcs Current sense pin voltage -0.3 5.5 V
Ics Current sense pin current -5 5
loo Over-current threshold pin current -5
ISD Shutdown pin current -5 mA
Icc Supply current (note 1) -20 20
dV/dt Allowable offset voltage slew rate -50 50 V/ns
PD Package power dissipation @ TA 3 +25''C (16 lead PDIP) - 1.60
PD = (TJMAX-TA)/RthJA (16 lead SOIC) - 1.00 W
RthJA Thermal resistance, junction to ambient (16 lead PDIP) - 75 o
(16Iead SOIC) - 115 C/W
TJ Junction temperature -55 150
Ts Storage temperature -55 150 ''C
TL Lead temperature (soldering, 10 seconds) - 300
Note 1: This IC contains a zener clamp structure between the chip VCC and COM which has a nominal breakdown
voltage of 15.6V. Please note that this supply pin should not be driven by a DC, low impedance power source
greater than the VCLAMP specified in the Electrical Characteristics section.
