DC/DC WHITE LIGHT LED DRIVER EC4006
P 1 / 8 DR18EC4006-Ver1.0
Dec. 2004 Rev. 1. 0
General Description
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 Temperature Range Part Number Marking ID Packing Type
SOP-8 -40℃ to 85℃ EC4006M EC4006M Tape/Reel
EC4006M is a standard tin-lead product, EC4006M-F means a Lead Free product.
DC/DC WHITE LIGHT LED DRIVER EC4006
P 2 / 8 DR18EC4006-Ver1.0
Dec. 2004 Rev. 1. 0
Pin Configuration
P / M Package
(SOP-8)
1
2
3
4
8
7
6
5
OH
OL
CT
GND FB
VCC
CS
DH
Top View
Figure 2. Pin Configuration of EC4006
Functional Block Diagram
Control &
Frequency
CKT
Output
Buffer
Reference
CKT
DH
CS
VCC
FB GND
CT
OL
OH
8
7
5
2
4
1
36
+
-
Figure 3. Functional Block Diagram of EC4006
DC/DC WHITE LIGHT LED DRIVER EC4006
P 3 / 8 DR18EC4006-Ver1.0
Dec. 2004 Rev. 1. 0
Pin Description
Pin Number Pin Name Function
1 OH Output buffer high voltage pin
2 OL Output buffer low voltage pin
3 CT Timing capacitor to control the switching frequency
4 GND Ground pin for all internal circuits
5 FB Feedback pin
6 Vcc Voltage supply
7 CS
Peck current sense Input by monitoring the voltage drop
across an external I sense resistor to limit the peak current
through the switch
8 DH Voltage driver output buffer
Absolute Maximum Ratings (Note 1)
Parameter Symbol Value Unit
Power Supply Voltage VCC 40 V
Driver Collector Current (Note 2) IC(driver) 100 mA
Switch Current ISW 0.8 A
Power Dissipation and Thermal Characteristics
Plastic Package,
Power Dissipation (TA= 25 ℃) PD 1.25 W
Thermal Resistance RθJ 100 ℃ /W
SOIC Package,
Power Dissipation (TA= 25℃)
Thermal Resistance
PD
RθJA
625
160
mW
℃ / W
Operating Junction Temperature TJ +150 ℃
Storage Temperature Range TSTG -65 to +150 ℃
ESD (Human body model) 2000 V
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 Symbol Min Max Unit
Supply Voltage VCC 3 36 V
Ambient Temperature TA -40 85 ℃
DC/DC WHITE LIGHT LED DRIVER EC4006
P 4 / 8 DR18EC4006-Ver1.0
Dec. 2004 Rev. 1. 0
Electrical Characteristics
(VCC = 5.0 V, TA =-40℃ to 85℃, unless otherwise specified.)
Parameter Symbol Conditions Min Typ Max Unit
OSCILLATOR
Frequency FOSC Vpin 5 =0V CT=1.0nF 24 35 42 KHz
TA= 25℃ CT=330pF 50 65 80 KHz
Charge Current ICHG VCC = 5.0 V to 36 V, TA= 25℃ 24 35 42 µA
Discharge Current IDISCHG VCC = 5.0 V to 36 V, TA= 25℃ 140 220 260 µA
Discharge to Charge Current
Ratio IDISCHG/ICHG Pin 7 to VCC, TA= 25℃ 5.2 6.5 7.5
Current Limit Sense Voltage VIPK(sense) ICHG= IDISCHG, TA= 25℃ 250 300 350 mV
OUTPUT BUFFER (Note 3)
Saturation Voltage VHL(sat) IOB= 0.6 A, Pins 1, 8
connected 1.0 1.3 V
Saturation Voltage VHL(sat) IOB= 0.6 A, RPin 8 = 82 Ω to
VCC, Forced β= 20 0.45 0.8 V
DC Current Gain hFE IOB= 0.6 A, VCE = 5.0 V 50 75
TA= 25℃
Output Buffer Off-State
Current IOB(off) VCE= 36 V 0.01 100 µA
COMPARATOR
Threshold Voltage VTH TA= 25℃
TA= -40℃ to 85℃
1.225
1.21
1.250 1.275
1.29
V
Threshold
Regulation
Voltage Line REGLINE VCC = 3.0 V to 36 V 1.4 5 mV
Input Bias Current IIB VIN= 0 V -20 -400 nA
TOTAL DEVICE
Supply Current
ICC VCC= 5.0 V to 36 V, CT = 1.0
nF, Pin 7 = VCC, Vpin 5 > VTH,
Pin 2 = GND, other pins open
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.
DC/DC WHITE LIGHT LED DRIVER EC4006
P 5 / 8 DR18EC4006-Ver1.0
Dec. 2004 Rev. 1. 0
Typical Performance Characteristics
DC/DC WHITE LIGHT LED DRIVER EC4006
P 6 / 8 DR18EC4006-Ver1.0
Dec. 2004 Rev. 1. 0
Typical Applications
(A) Step-Up type
Figure 9. Step-Up type
DC/DC WHITE LIGHT LED DRIVER EC4006
P 7 / 8 DR18EC4006-Ver1.0
Dec. 2004 Rev. 1. 0
(B) Step-Down type
Figure 10. Step-Down type
DC/DC WHITE LIGHT LED DRIVER EC4006
P 8 / 8 DR18EC4006-Ver1.0
Dec. 2004 Rev. 1. 0
Mechanical Dimensions
