ST L6567 User Manual
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n
BCD-OFF LINE TECHNOLOGY
n FLOATING SUPPLY VOLTAGE UP TO 570V
n
GND REFERRED SUPPLY VOLTAGE UP TO
18V
n UNDER VOLTAGE LOCK OUT
n
CLAMPING ON Vs
n
DRIVER CURRENT CAPABILITY:
30mA SOURCE
70mA SINK
n
PREHEAT AND FREQUENCY SHIFT TIMING
L6567
HIGH VOLTAGE DRIVER FOR CFL
MULTIPOWER BCD TECHNOLOGY
SO14 DIP14
ORDERING NUMBERS:
L6567D L6567
DESCRIPTION
The device is amonolithic high voltage integrated circuit designed to drive CFL and small TL lamps with a
minimum part count.
It provides all the necessary functions for proper preheat, ignition andsteady state operation of the lamp:
♦ variable frequency oscillator;
BLOCK DIAGRAM
Vhv
C
SCfCi
Rhv
RHV
13
V
5
S
FEED FORWARD
CF
12
VCO +
14
FREQ. SHIFTING
VOLTAGE
REFERENCE
to
comp.
GENERATOR
CI
BIAS
CURRENT
10
R
Ref
REF
Cp/Cav
CP
8
V
S
PREHEATING
TIMING
LOGIC
♦
settable preheating and ignition time;
♦
capacitive mode protection;
♦
lamp power independentfrom mains voltage variation.
Besides the control functions, theIC provides the level shift anddrive function for twoexternal power MOS
FETs in a half-bridge topology.
F
LEVEL
SHIFTING
C
HIGH
SIDE
DRIVER
LOW
SIDE
DRIVER
1
S
Cboot
G1
2
S1
3
6
G2
7
PGND
SGND
11
9
R
S
T1
L
T2
Rshunt
D96IN441B
Vhv
Lamp
CL
Chv
Chv
MAINS
January 2000
This ispreliminary information on a new product now in development. Details are subject to change without notice.
1/15
L6567
PIN FUNCTION
N° Pin Description
1F
2 G1 Gate of high side switch
3 S1 Source of high side switch
4 NC High Voltage Spacer. (Should be not connected)
5V
6 G2 Gate of low side switch
7 PGND Power Ground
8 CP First timing (TPRETIGN), then averaging the ripple in the representation of the HVB (derived
9R
10 R
11 SGND Signal Ground. Internally Connected to PGND
12 CF Frequency setting capacitor
13 RHV Start-up supply resistor, then supply voltage sensing.
14 CI Timing capacitor for frequency shift
Floating Supply of high side driver
S
Supply Voltage for GND level control and drive
S
through RHV).
R
S
Reference resistor for current setting
REF
: current monitoring input
SHUNT
PIN CONNECTION (Top view)
2/15
FS
G1
S1
N.C.
V
G2
PGND
14
2
3
4
S
5
6
7
D96IN440
13
12
11
10
9
8
CI1
RHV
CF
SGND
RREF
RS
CP
ABSOLUTEMAXIMUM RATINGS
Symbol Parameter Value Unit
L6567
Low Voltage Supply 18 (1) V
S
Mains Voltage Sensing VS +2VBE (2)
Preheat/Averaging 5 V
Oscillator Capacitor Voltage 5 V
Frequency Shift Capacitor Voltage 5 V
Reference Resistor Voltage 5 V
Current Sense Input Voltage -5 to 5 V
V
V
V
V
V
V
RHV
CP
CF
V
CI
RREF
RS
transient 50ns -15 V
V
G2
V
S1
Low Side Switch Gate Output 18 V
High Side Switch Source Output: normal operation -1 to 373 V
0.5sec mains transient -1 to 550 V
VG1 High Side Switch Gate Output: normal operation -1 to 391 V
0.5sec mains transient -1 to 568 V
with respect to pin S1 V
V
FS
Floating Supply Voltage: normal operation 391 V
be
to V
S
0.5sec mains transient 568 V
V
V
FS/S1
∆V
FS/∆T
∆V
S1/∆T
I
RHV
I
Vs
T
stg
T
NOTES: (1) Do not exceed package thermal dissipation limits
Note: ESD immunity for pins 1, 2 and 3 is guaranteed up to 900 V (Human Body Model)
Floating Supply vs S1 Voltage 18 V
VFS Slew Rate (Repetitive) -4 to 4 V/ns
VS1 Slew Rate (Repetitive) -4 to 4 V/ns
Current Into R
Clamped Current into V
HV
S
Storage Temperature -40 to 150 °C
Junction Temperature -40 to 150 °C
j
(2) For VS ≤ VShigh 1
(3) For VS > VS high 1
(4) Internally Limited
3 (3) mA
200 (4) mA
3/15
L6567
ELECTRICAL CHARACTERISTCS
(VS=12V;R
Symbol Parameter Test Condition Min. Typ. Max. Unit
- SUPPLYVOLTAGE SECTION
V
S
=30KΩ;CF= 100pF; Tj=25°C; unless otherwise specified.)
REF
V
S high 1
V
S high2
V
S low 2
V
S HYST
V
S low 1
I
SSP
I
SOP
VSTurn On Threshold 10.7 11.7 12.7 V
VSClamping Voltage VS = 20mA 12 13 14 V
VSTurn Off Threshold 9 10 11 V
Supply Voltage Hysteresis 1.5 1.65 1.8 V
VSVoltage to Guarantee
=”0”and VG2=”1
V
G1
16V
VSSupply Current at Start Up VS= 10.6V Before turn on 50 250 mA
VSSupply Operative Current VS= VShigh 1 1.2 mA
OSCILLATOR SECTION
f
osc min
f
osc 600
f
osc 1mA
Minimum Oscillator frequency I
Feed Forward Frequency I
m
Feed Forward Frequency I
= 0mA; CI = 5V 41.7 43 44.29 kHz
RHV
= 600mA 47.88 50.4 52.92 kHz
RHV
= 1mA 79.8 84 88.2 kHz
RHV
fosc max Maximum Oscillator Frequency CI = 0V 96.75 107.5 118.25 KHz
∆ICF/∆V
Oscillator Transconductance 9 17.5 µA/V
CI
PREHEAT/IGNITION SECTION
P.H.T. Preheat Time Cp = 150nF 0.88 1 1.12 sec
P.H.clocks Number of Preheat Clocks 16
IGN.clocks Number of Ignition Clocks 15
RATE OF FREQUENCY CHANGE SECTION
ICIP charge CI Charging Current During
106 118 130 mA
Preheat
ICII charge CI Charging Current During
1 1.2 1.4 mA
Ignition
ICI disch CI Discharge Current -52 -47 -42 mA
V
TH CI
CI Low Voltage Threshold 10 100 mV
RS - THRESHOLD SECTION
V
CMTH
Capacitive Mode Voltage
02040mV
Threshold
V
PH
Preheat Voltage Threshold -0.64 -0.6 -0.56 V
G1 - G2DELAY TIMES SECTION
G1
DON
On Delay of G1 Output 1.05 1.4 1.75
4/15
s
µ
L6567
ELECTRICAL CHARACTERISTCS
(Continued)
Symbol Parameter Test Condition Min. Typ. Max. Unit
G2
DON
G1
+
DONG1ON
------- ------ -------- ------- -------- --- -- --
G2
+
DONG2ON
On Delay of G2 Output 1.05 1.4 1.75
Ratio between Delay Time +
Conduction Time of G1 and G2
I
= 1mA; Cl = 5V
RHV
Cl = 0V
0.87
0.77
1.15
1.30
LOW SIDE DRIVER SECTION
Ron G2 so G2 Source Output Resistance V
Ron G2 si G2 Sink OutputResistance V
Ron G1 so G1 Source Output Resistance V
Ron G1 si G1 Sink OutputResistance V
= 12V,V = 3V 80 190
S
= 12V,V = 3V 65 125 Ω
S
= 10V,V = 3V 80 190 Ω
S
= 10V,V = 3V 65 125 Ω
S
HIGH SIDE DRIVER SECTION
I
FSLK
I
S1 LK
Leakage Current of FS PIN to
GND
Leakage Current of S1 PIN to
GND
VFS= 568V; G1 = L
= 568V; G1 = H
V
FS
VS1= 568V; G1 = L
= 568V; G1 = H
V
S1
5
5
5
5
BOOTSTRAP SECTION
Boot Th BOOTSTRAP Threshold V
= 10.6V before turnon 5 (*) V
S
µ
Ω
µA
µA
µA
µA
s
AVERAGE RESISTOR
R
AVERAGE
(*) Beforestartingthe first commutation; when switching 6V is guaranteed.
Average Resistor 27 38.5 50 kΩ
General operation
The L6567 uses a small amount of current from a supply resistor(s) to start the operation of the IC. Once start
up condition isachieved, the IC turns on the lower MOS transistor of the half bridge which allows the bootstrap
capacitor to charge. Once this is achieved, the oscillator begins toturn on the upper and lower MOStransistors
at high frequency, and immediately ramps down to a preheat frequency. During this stage, the IC preheats the
lamp and after a predetermined time ramps down again until it reaches the final operating frequency. The IC
monitors thecurrentto determine if the circuitisoperating in capacitivemode.If capacitive switchingis detected,
the IC increases the output frequency until zero-voltage switching is resumed.
Startup and supply in normal operation
At start up the L6567 is powered via a resistor connected to the RHVpin (pin 13) from the rectified mains. The
current charges the C
V
SLOW1
(max 6V), the low side MOS transistor is turned on while the high side one is kept off. This condition
assures that the bootstrap capacitor is charged. When V
the R
pin does not provide anymore the supply current for the IC (seefig.1).
HV
capacitor connected to the VSpin (pin 5). When the VSvoltage reaches the threshold
S
SHIGH1
threshold is reached the oscillator starts, and
5/15
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