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L6572D013TRSTN/a10000avaiHIGH VOLTAGE SMART BALLAST CONTROLLER


L6572D013TR ,HIGH VOLTAGE SMART BALLAST CONTROLLERFunctional description . . . . . . 105.1 Signal processing block . . . . . . 105.2 Curren ..
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L6572D013TR
HIGH VOLTAGE SMART BALLAST CONTROLLER
October 2012 Doc ID 023882 Rev 1 1/22
L6572

High voltage smart ballast controller
Datasheet − production data
Features
600 V half-bridge driver Integrated bootstrap diode Failure protection logic Programmable deadtime Programmable preheated start Two-step dimming with programmable dimmed
current Thermal powerboost Closed loop control operation
Applications
CFLi Electronic ballast

Figure 1. Block diagram
Contents L6572
2/22 Doc ID 023882 Rev 1
Contents Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Electrical ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

5.1 Signal processing block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5.2 Current regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5.3 ZVS control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5.4 Two-step dimming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5.5 Rated current generation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.6 Thermal powerboost control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.7 Output stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.8 Deadtime generation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.9 Undervoltage lockout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.10 Voltage reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.11 Ignition recognition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.12 Clock generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.13 Counter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.14 D/A converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
6.1 Target applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
6.2 Designing a simple fixed power CFLi application using the L6572 . . . . . 16
6.3 Two-step dimmable CFLi application . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
7Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
L6572 Description
Doc ID 023882 Rev 1 3/22
1 Description

The L6572 is a high voltage half-bridge driver for current regulation, quasi-self-oscillating
ballast.
It contains all functions that are needed to preheat the filaments, to ignite and to operate a
fluorescent lamp.
During normal operation of the lamp, the ballast operates either with the nominal or with a
reduced resonant current which results in a nominal or a reduced light output of the lamp.
A change between those two possible light outputs of the lamp is triggered by disconnecting
the mains voltage for a short time (two-step dimming). The filaments are preheated before
the lamp is re-ignited after every disconnection of the mains voltage.
A powerboost function is included to accelerate the startup behavior of the fluorescent lamp
when the junction temperature is below a defined temperature.
An undervoltage lockout is active while loading the blocking capacitor via the startup resistor
as long as the supply voltage VS is below a defined value. The bootstrap capacitor is loaded
before the high-side transistor is switched on the first time to start the oscillation of the
ballast.
The output drivers are designed to drive external N-channel power MOSFET and IGBT
(max. input capacity Cinput ≤ 1 nF) without any additional gate resistor.
A constant deadtime for both switches can be programmed with one external resistor.
The rated resonant current for the nominal lamp operation with nominal light output, the
dimmed operation with reduced light output and the preheating phase is defined by three
external resistors considering the shunt resistance.
The ratio XPB between the nominal rated resonant current during normal operation and the
powerboost phase is fixed internally. The time lapse is given by an internally fixed number of
load/unload-cycles of an internal capacitor.
An absolute time base, used to regulate periods and intervals, is given by the duration of a
load/unload-cycle of the internal capacitor with a load current that is defined with an external
resistor.
Description L6572
4/22 Doc ID 023882 Rev 1
Figure 2. Typical application
L6572 Pin connection
Doc ID 023882 Rev 1 5/22
2 Pin connection
Figure 3. Pin connection
Table 1. Pin description
Electrical ratings L6572
6/22 Doc ID 023882 Rev 1
3 Electrical ratings
Table 1. Pin description (continued)
Table 2. Absolute maximum ratings
The device has an internal Zener clamp between TSD and GND (typical 12.8 V)
L6572 Electrical ratings
Doc ID 023882 Rev 1 7/22
Table 3. Recommended operating conditions
No external circuitry has to force any voltage on the pin RPH while the undervoltage lockout is activated.
Table 4. Thermal characteristics
Electrical characteristics L6572
8/22 Doc ID 023882 Rev 1
4 Electrical characteristics

(VS = 14.4 V, VBOOT - Vout = 14.4 V , TAMB = 25 °C, unless otherwise specified)
Table 5. Electrical characteristics
L6572 Electrical characteristics
Doc ID 023882 Rev 1 9/22
Figure 4. Test signal

where: Test A: starting voltage Vm = ± 465 mV, half period T = 6,67 μs (f = 75 kHz; tDT = 2,5
μs) Test B: starting voltage Vm = ± 340 mV, half period T = 10,0 μs (f = 50 kHz; tDT = 2,5
μs) Test C: starting voltage Vm = ± 340 mV , half period T = 12,5 μs (f = 40 kHz; tDT = 2,5
μs) T measured from the falling edge of HVG (LVG) to the falling edge of LVG (HVG). Guaranteed by design. For a correct operation of the TSD function, the internal clamping diode has always to be turned on with the
minimum supply voltage of the device.
Table 5. Electrical characteristics (continued)
Functional description L6572
10/22 Doc ID 023882 Rev 1
5 Functional description
5.1 Signal processing block

The resonant current is detected with a shunt resistor which delivers a voltage signal to the
SENSE pin that is related to the GND pin.
Voltages at the SENSE pin amount to approx. 400 mV(rms) during normal operation
respectively up to 10 V(peak) during ignition.
An overriding of the amplifier is given by sense voltages above ± 4.5 V.
5.2 Current regulation
5.3 ZVS control

Thanks to the implemented ZVS control function, the conducting transistor is switched off at
the latest when the resonant current changes its direction. Therefore, the half-bridge
operates in the inductive region of the resonance characteristics of the ballast. In the worst
case, working close to the pole frequency is allowed.
5.4 Two-step dimming

The ballast operates the lamps with nominal or reduced light output. A change between
these two operation modes is achieved by disconnecting the line voltage for a time t < tTSD.
An internal binary information cell changes its state at the end of every preheating phase.
Depending on the state of this cell, the reduced or the nominal rated resonant current is
given to the current regulation unit in order to operate the lamp with nominal or reduced light
output.
L6572 Functional description
Doc ID 023882 Rev 1 11/22
The internal information cell is provided with the structure embedded in TSD pin and is able
to keep its state as long as the voltage on this pin is above VTSD. When the voltage on the
TSD pin decreases below VTSD before the ballast is reconnected to the mains, the
information cell is set to a state that leads to nominal light output of the lamp when the lamp
is reconnected to the line voltage next time.
The time tTSD is defined by the voltage of the half-bridge when the oscillation stops, the
current consumption (ITSD) of the TSD-pin and the resistor RA. Decreasing the time, tTSD
may be achieved by connecting a resistor RB between the TSD pin and GND. (see
Figure7).
When the lamp is operated with reduced light output, the thermal powerboost time (see
Section 5.6) is shortened to 1022 period times of the clock generator in any case.
If the voltage on the TSD pin is kept below 0.5 V until the lamp has ignited, a change
between normal operation mode and dimmed operation mode can be achieved by every
transition of the voltage on the TSD pin while the lamp is burning: a voltage VTSD < 0.5 V
leads to the normal operation, a voltage VTSD > 6.2 V (typ.) leads to the dimmed operation.
Steady-state voltages between 0.5 V and 6.2 V (typ.) on the TSD pin have to be avoided.
The current consumption of the TSD pin is controlled by design with an internal bias circuit
that has a compensated temperature behavior.
The two-step dimming function can be deactivated by connecting the TSD pin to GND. In
this case, the lamp is always operated with nominal light output.
5.5 Rated current generation

A reference current is used to feed the external resistors RPH, RNO and RDO. The voltages
formed across these resistors are converted into internal rated voltage for integrator's
comparator during each operation phases of the ballast (see Figure5).
In order to compensate both the tolerances and the temperature variations of such a
reference current, it is matched with the current used to charge the integrating capacitance
Cint. As a result, the obtained lamp current has the same tolerance as the external
programming resistors even if the relevant rated voltages have noticeable variations.
During the preheating phase, the rated resonant current is defined by the external resistor
RPH.
The length of the preheating phase is defined by the duration of 40960 period times of the
clock generator (a frequency fCL=100 kHz results in a duration of the preheating phase of
410 ms).
During the ignition phase, the rated resonant current increases from the preheating level to
a level that ensures an operation of the half-bridge very close to the pole frequency of the
resonant lamp circuit.
This increase is internally reached with a ramp composed by 31 steps given by the D/A-
converter block. In the first half of the ramp, height out of the ramp steps are smaller than
those in the second half of the ramp. The length of each step is defined by the duration of
512 half waves of the resonant current. The last step of the ramp is reached after 15872 half
waves (512 x 31).
The end of the ignition phase is reached only when the ignition recognition unit delivers a
trigger signal (Section 5.11). In this case, the ignition phase is ended and the rated resonant
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