POWER&RF
4-36
2005 WINTER
CCFL inverter controller IC
CCFLIC
TK75020M
DESCRIPTION
The TK75020M is a PWM controller IC especially designed
for CCFL inverter having dimmer.
It realizes the CCFL inverter of single-ended and single-stage
type having dimmer function and quasi-sine wave in lamp
current.
Single-ended and single-stage enable the simplification of
circuit and elevation of efficiency both.
Lamp drive current of quasi-sine wave elevates the luminosity
of lamp and make EMI level negligible.
It has various protecting function for PWM inverter and
converter and is very useful for DC-DC converter of Zero
Voltage Switching (Resonance).
TK75020M
PWM
IC
TK75020M
DC-DC
FEATURES
ZVD(Zero Voltage Detecting)
Constant off time (applicable)
On/off control
On/off
Over voltage/current protection
/
For CFL inverter of high efficiency
(/)
For DC-DC converter of ZVS(Zero Voltage Switching)
DC-DC
APPLICATIONS
Cold cathode fluorescent lamps
Resonant power supplies
Power supplies for note-PC and personal electronics
PACKAGE OUTLINE
ORDERING INFORMATION
Part name
Package
Marking Pin configuration
Ordering information
TK75020M
SOP-14
75020
See next
page
7
T K
2
5 0
0 M T
Package code
Storage direction
M: SOP
TL: Left type
L
ABSOLUTE MAXIMUM RATINGS
Parameter
Symbol Rating Unit Remarks
Operating Voltage Range
V
OP
to 16
V
Operating Temperature Range
T
OP
-20 to +85
C
Power Dissipation
P
D
500
mW
POWER&RF
2005 WINTER
4-37
1
2
3
4
5
6
7
8
9
10
11
12
13
ELECTRICAL CHARCTERISTICS
V
CC
=12V, C
ON/OFF
=2.4V, C
T
=360pF, I
TON/SS
=I
TOFFMAX
=-50A, DRV: open, T
A
=25
C unless otherwise stated.
Value
Parameter
Symbol
MIN
TYP
MAX
Units
Conditions
Supply Section (V
CC
Pin)
I
CC, OFF
2
100
A
V
ON/OFF
0V
Supply Current (Off mode) ()
I
CC, OFF, H
2
mA
V
ON/OFF
=0V,V
CC
=16V
Supply Current (UVLO mode) (UVLO)
I
CC, UVLO
700
1000
A
V
CC
=5.0V
4.7
6
mA
V
CC
=6V
I
CC, ON
8
mA
6V<V
CC
<16V
5.6
8
mA
V
CC
=6V, C
DRV
=1nF
Supply Current (On mode)
()
I
CC, ON, DRV
10
mA
6V<V
CC
<16V
UVLO High ThresholdUVLO
V
CC, ON
5.2
5.7
6.1
V
UVLO Low Threshold UVLO
V
CC, OFF
5.0
5.4
5.7
V
UVLO Hysteresis
UVLO
V
CC, HYST
80
500
mV
ON/OFF Section (EN Pin)
Threshold Voltage
V
ON/OFF
0.4
2.4
V
6V<V
CC
<16V
Input Current
I
ON/OFF
4.0
A
V
ON/OFF
=2.4V
Reference Section (REF Pin)
3.8
4.0
4.2
V
I
REF
=0mA, T
A
=25
Reference Output Voltage
V
REF
3.7
4.0
4.3
V
I
REF
=0mA, T
A
=full range
Short Circuit Current
I
REF, SC
-12
mA
V
REF
=0V
Drive Section (DRV Pin)
Output High Voltage
V
DRV, HIGH
9.0
10.0
V
I
DRV
=-20mA
Output Low Voltage
V
DRV, LOW
0.3
0.6
V
I
DRV
=20mA
Rise Time
t
RISE
70
120
ns
C
DRV
=1nF
Fall Time
t
FALL
25
75
ns
C
DRV
=1nF
Error Amplifier Section (EA INV and EA OUT Pin)
Equivalent Internal Reference Voltage
V
EA, REF
1.19
1.26
1.30
V
Bias Current
I
EA INV
0.10
A
Gain-Bandwidth Product
-
GBW
2
MHz
15k
from EA OUT to TON/SS *1
Current Limit Section (CL Pin)
Bias Current
I
CL
-0.2
A
V
CL
=0V
Threshold Voltage
V
CL, TH
180
210
240
mV
Delay to DRV
DRV
t
CL, D
150
ns
V
CL
step from 0V to 400mV
On-Time Setting and Soft-Start Section (TON/SS Pin)
Short Circuit Current
I
TON/SS,SC
-2.5
mA
V
TON/SS
=0V
Pin Voltage
V
TON/SS
1.8
2.0
2.2
V
I
TON/SS
=0mA
Soft Start Threshold
V
SS, TH
0.40
0.65
0.90
V
ODP Discharge Threshold
ODP
V
DCH, TH
1.0
1.4
1.9
V
Maximum Off-Time Setting Section (TOFF MAX Pin)
Short Circuit Current
I
TOFF MAX
2.5
mA
V
TOFF
MAX=0V
Pin Voltage
V
TOFF MAX
1.8
2.0
2.2
V
I
TOFF
MAX=0mA
Timing Section (CT Pin)
Low Threshold Voltage
V
CT, LOW
0.9
1.0
1.1
V
High Threshold Voltage
V
CT, HIGH
2.7
3.0
3.3
V
Oscillator Frequency
f
115
140
165
kHz
Current Transfer Ratio to CT Pin, On-Time Setting
CT
C
TRTON
-6.2
-5.5
-4.8
VCT=4V
Current Transfer Ratio to CT Pin, MAX Off-Time Setting
CT
C
TRTOFF MAX
4.75
5.25
5.75
VCT=0V
Zero Voltage Detector Section (ZVD Pin)
Detection Low Threshold
V
ZVD, TH
1.8
2.0
2.2
V
Ta=25
Delay to DRV
DRV
t
ZVD, D
170
300
ns
V
ZVD
step from 5V to 0V, C
DRV
=1nF
Over Dissipation Protection Section (ODP Pin)
ODP Threshold Voltage
V
ODP, TH
0.45
0.70
0.95
V
Over Voltage Protection Section (OVP Pin)
POWER&RF
4-38
2005 WINTER
V
CC
=12V, C
ON/OFF
=2.4V, C
T
=360pF, I
TON/SS
=I
TOFFMAX
=-50A, DRV: open, T
A
=25
C unless otherwise stated.
Value
Parameter
Symbol
MIN
TYP
MAX
Units
Conditions
OVP Threshold Voltage
V
OVP, TH
3.6
4.0
4.3
V
Delay to DRV
DRV
t
OVP, D
350
ns
Note 1: Guaranteed by design; not 100% tested.
BLOCK DIAGRAM
TOFF MAX
A1
+2V
TON/SS
A2
CT
Q1
Q9
Q10
Q11
REF
V
REF
Q8
Q7
Q6
REF
Q4
Q3
Q2
R1
1k
R2
1k
Q16
EA OUT
EAINV
Q12
Q13
1.25V
Q14
ERROR AMP
V
BE
2V
BE
-V
BE
Q5
SOFT START CMP
ODP DISCHARGE CMP
CMP4
CMP3
CMP2
1.5V
3V
1V
S
R
Q
CSW LATCH
HIGH RAMP DOWN
G1
G2
G3
S
R
Q
DRV LATCH
S
R
Q
ODP LATCH
S
R
Q
CL LATCH
G4
OVER DISSIPATION / OVER VOLTAGE PROTECTION
V
CC
V
CC
B
0
EN
0
ON / OFF
V
CC
EN
OUT
BANDGAP REF
START UP BIAS
REF
GND
+4V
REF CMP
REF BUFFER
5.8/5.3V
UVLO CMP
B
2
EN
2
BUFFERED BIAS
B
1
EN
1
V
CC
EN
1
REF
3.0V
2.0V
1.5V
1.25V
1.0V
0.2V
G5
EN
4
REF
Q15
CL CMP
Q17
REF
ODP CUR SRC
OVP
ODP
0.21V
CL
CURRENT LIMITER
EN
3
EN
3
B
1
V
CC
DRV
DRIVE
ZVD CMP
D1
2.5/2.7V
ZVD
V
CC
50uA
STAND-BY
GATE
DISCHARGE
ZVS DRIVE
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