ETC2 EC4006 Dc/dc white light led driver Datasheet

DC/DC WHITE LIGHT LED DRIVER
EC4006
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.
P1/8
DR18EC4006-Ver1.0
Dec. 2004 Rev. 1. 0
DC/DC WHITE LIGHT LED DRIVER
EC4006
Pin Configuration
P / M Package
(SOP-8)
OH
1
8
DH
OL
2
7
CS
CT
3
6
VCC
GND
4
5
FB
Top View
Figure 2. Pin Configuration of EC4006
Functional Block Diagram
DH
8
1
Control &
CS
Output
Buffer
7 Frequency
2
CKT
6
3
VCC
OL
CT
Reference
CKT
+
-
FB
OH
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
EC4006
Pin Description
Pin Number
Pin Name
1
2
3
4
5
6
OH
OL
CT
GND
FB
Vcc
7
CS
8
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
Symbol
Value
Unit
VCC
40
V
IC(driver)
100
mA
ISW
0.8
A
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
Power Supply Voltage
Driver Collector Current (Note 2)
Switch Current
Power Dissipation and Thermal Characteristics
Plastic Package,
Operating Junction Temperature
Storage Temperature Range
TJ
+150
℃
TSTG
-65 to +150
℃
2000
V
ESD (Human body model)
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
Min
Max
Unit
VCC
3
36
V
TA
-40
85
℃
P3/8
DR18EC4006-Ver1.0
Dec. 2004 Rev. 1. 0
DC/DC WHITE LIGHT LED DRIVER
EC4006
Electrical Characteristics
(VCC = 5.0 V, TA =-40℃ to 85℃, unless otherwise specified.)
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
24
50
35
65
42
80
KHz
KHz
24
35
42
µA
140
220
260
µA
OSCILLATOR
Frequency
FOSC
Charge Current
ICHG
Discharge Current
IDISCHG
Discharge to Charge Current
Ratio
Current Limit Sense Voltage
Vpin 5 =0V
TA= 25℃
CT=1.0nF
CT=330pF
VCC = 5.0 V to 36 V, TA= 25℃
VCC = 5.0 V to 36 V, TA= 25℃
IDISCHG/ICHG
Pin 7 to VCC, TA= 25℃
5.2
6.5
7.5
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
0.01
100
µA
1.250
1.275
1.29
V
1.4
5
mV
-20
-400
nA
4.0
mA
DC Current Gain
hFE
IOB= 0.6 A, VCE = 5.0 V
50
75
TA= 25℃
Output Buffer Off-State
Current
COMPARATOR
IOB(off)
VTH
Threshold Voltage
Threshold
Regulation
Voltage
Input Bias Current
Line
REGLINE
VCE= 36 V
TA= 25℃
TA= -40℃ to 85℃
VCC = 3.0 V to 36 V
IIB
VIN= 0 V
ICC
VCC= 5.0 V to 36 V, CT = 1.0
nF, Pin 7 = VCC, Vpin 5 > VTH,
Pin 2 = GND, other pins open
1.225
1.21
TOTAL DEVICE
Supply Current
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
EC4006
Typical Performance Characteristics
P5/8
DR18EC4006-Ver1.0
Dec. 2004 Rev. 1. 0
DC/DC WHITE LIGHT LED DRIVER
EC4006
Typical Applications
(A) Step-Up type
Figure 9. Step-Up type
P6/8
DR18EC4006-Ver1.0
Dec. 2004 Rev. 1. 0
DC/DC WHITE LIGHT LED DRIVER
EC4006
(B) Step-Down type
Figure 10. Step-Down type
P7/8
DR18EC4006-Ver1.0
Dec. 2004 Rev. 1. 0
DC/DC WHITE LIGHT LED DRIVER
EC4006
Mechanical Dimensions
P8/8
DR18EC4006-Ver1.0
Dec. 2004 Rev. 1. 0
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