DC/DC WHITE LIGHT LED DRIVER
General Description
EC4006
The EC4006 is a monolithic constant current white light LED driver using PWM control method.
This device consists of internal temperature compensated reference, voltage comparator,
controlled duty cycle oscillator with active current limit circuit, driver and high current output switch.
This device is specifically designed be used in Step-Down and Step-Up applications with a few
external components.
The EC4006 package is SOP-8.
Features
• Operation input voltage from 3.0V to 36V
• Low Standby Current
• Current Limiting
• Output Switch Current to 0.8A
• Constant output current
• Operation Frequency up to 65KHz (CT=330pF)
Applications
· White light LED driver
SOP-8
Figure 1. Package Types of EC4006
Ordering Information
Package
SOP-8
Temperature Range
-40
℃
to 85
℃
Part Number
EC4006M
Marking ID
EC4006M
Packing Type
Tape/Reel
EC4006M is a standard tin-lead product, EC4006M-F means a Lead Free product.
P1/8
DR18EC4006-Ver1.0
Dec. 2004 Rev. 1. 0
DC/DC WHITE LIGHT LED DRIVER
Pin Configuration
EC4006
P / M Package
(SOP-8)
OH
OL
CT
GND
1
2
3
4
8
7
6
5
DH
CS
VCC
FB
Top View
Figure 2. Pin Configuration of EC4006
Functional Block Diagram
DH
8
Output
Buffer
1
OH
7
CS
Control &
Frequency
CKT
2
OL
6
VCC
+
-
3
Reference
CKT
CT
FB
5
4
GND
Figure 3. Functional Block Diagram of EC4006
P2/8
DR18EC4006-Ver1.0
Dec. 2004 Rev. 1. 0
DC/DC WHITE LIGHT LED DRIVER
Pin Description
Pin Number
1
2
3
4
5
6
7
8
EC4006
Pin Name
OH
OL
CT
GND
FB
Vcc
CS
DH
Function
Output buffer high voltage pin
Output buffer low voltage pin
Timing capacitor to control the switching frequency
Ground pin for all internal circuits
Feedback pin
Voltage supply
Peck current sense Input by monitoring the voltage drop
across an external I sense resistor to limit the peak current
through the switch
Voltage driver output buffer
Absolute Maximum Ratings (Note 1)
Parameter
Power Supply Voltage
Driver Collector Current (Note 2)
Switch Current
Power Dissipation and Thermal Characteristics
Plastic Package,
Power Dissipation (T
A
= 25
℃)
Thermal Resistance
SOIC Package,
Power Dissipation (T
A
= 25℃)
Thermal Resistance
Operating Junction Temperature
Storage Temperature Range
ESD (Human body model)
P
D
R
θJ
P
D
R
θJA
T
J
T
STG
1.25
100
625
160
+150
-65 to +150
2000
W
℃
/W
mW
℃
/W
℃
℃
V
Symbol
V
CC
I
C
(driver)
I
SW
Value
40
100
0.8
Unit
V
mA
A
Note1: Stresses greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to
thedevice. These are stress ratings only, and functional operation of the device at these or any other conditions
beyond those indicated under "Recommended Operating Conditions" is not implied. Exposure to "Absolute
Maximum Ratings" for extended periods may affect device reliability.
Note 2: Maximum package power dissipation limits must be observed.
Recommended Operating Conditions
Parameter
Supply Voltage
Ambient Temperature
Symbol
V
CC
T
A
Min
3
-40
Max
36
85
Unit
V
℃
P3/8
DR18EC4006-Ver1.0
Dec. 2004 Rev. 1. 0
DC/DC WHITE LIGHT LED DRIVER
Electrical Characteristics
EC4006
(
V
CC
= 5.0 V, T
A
=-40
℃
to 85
℃
, unless otherwise specified.)
Parameter
OSCILLATOR
Frequency
Charge Current
Discharge Current
Discharge to Charge Current
Ratio
Current Limit Sense Voltage
OUTPUT BUFFER
(Note 3)
Saturation Voltage
Saturation Voltage
DC Current Gain
Output Buffer Off-State
Current
COMPARATOR
Threshold Voltage
Threshold
Regulation
Voltage
Line
Symbol
Conditions
V
pin 5
=0V
T
A
= 25
℃
CT=1.0nF
CT=330pF
Min
24
50
24
140
5.2
250
Typ
35
65
35
220
6.5
300
Max
42
80
42
260
7.5
350
Unit
KHz
KHz
µA
µA
F
OSC
I
CHG
I
DISCHG
I
DISCHG
/I
CHG
V
IPK
(sense)
V
CC
= 5.0 V to 36 V, T
A
= 25
℃
V
CC
= 5.0 V to 36 V, T
A
= 25
℃
Pin 7 to V
CC
, T
A
= 25
℃
I
CHG
= I
DISCHG
, T
A
= 25
℃
I
OB
= 0.6 A, Pins 1, 8
connected
I
OB
= 0.6 A, R
Pin 8
= 82
Ω
to
V
CC
, Forced
β=
20
I
OB
= 0.6 A, V
CE
= 5.0 V
T
A
= 25
℃
mV
V
HL
(sat)
V
HL
(sat)
h
FE
1.0
0.45
50
75
1.3
0.8
V
V
I
OB
(off)
V
TH
R
EGLINE
I
IB
I
CC
V
CE
= 36 V
1.225
1.21
0.01
1.250
1.4
-20
100
1.275
1.29
5
-400
µA
V
mV
nA
T
A
= 25
℃
T
A
= -40
℃
to 85
℃
V
CC
= 3.0 V to 36 V
V
IN
= 0 V
V
CC
= 5.0 V to 36 V, CT = 1.0
nF, Pin 7 = V
CC
, V
pin 5
> V
TH
,
Pin 2 = GND, other pins open
Input Bias Current
TOTAL DEVICE
Supply Current
4.0
mA
Note 3. Low duty cycle pulse technique is used during test to maintain junction temperature as
close to ambient temperature as possible.
P4/8
DR18EC4006-Ver1.0
Dec. 2004 Rev. 1. 0
DC/DC WHITE LIGHT LED DRIVER
Typical Performance Characteristics
EC4006
P5/8
DR18EC4006-Ver1.0
Dec. 2004 Rev. 1. 0
