FP7176
LED Driver with Average-Mode Constant Current Control
General Description
The FP7176 is an average current mode control LED driver IC operating in a constant off-time
mode. FP7176 does not produce a peak-to-average error, and therefore greatly improves accuracy,
line and load regulation of the LED current without any need for loop compensation or high-side
current sensing. The output LED current accuracy is ±2%.
The FP7176 can be powered from an 8.0 - 450V supply. A PWM dimming input is provided that
accepts an external control TTL compatible signal. The output current can be programmed by an
internal 277mV reference, or controlled externally through a 0 - 1.5V dimming input.
Features
Fast average current control
Internal 8 to 450V linear regulator
Programmable constant off-time switching
Linear and PWM dimming capability
Output short circuit protection with skip mode
Requires few external components for operation
Applications
DC/DC or AC/DC LED driver applications
LED street lighting
Back lighting of flat panel displays
General purpose constant current source
Signage and decorative LED lighting
Chargers
Typical Application Circuit
VIN
VIN
LED
Load
RT
Linear
Dimming
CS
LD
FP7176
GND
VDD
GATE
PWMD
PWM
Dimming
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Website:
http://www.feeling-tech.com.tw
Rev. 0.62
1/14
FP7176
Function Block Diagram
VIN
Regulator
Internal
supply
POR
UVLO
VDD
LD
150mV/200mV
Average Current
Logic Control
GATE
MIN (V
LD
∙ 0.185, 0.277V
PWMD
GND
LEB
550mV
SCP
OTP
T
OFF
Timer
CS
RT
Pin Descriptions
SOP-8L
TOP View
VIN
CS
GND
GATE
1
8
Name
RT
LD
VDD
PWMD
No. I / O
1
2
3
4
5
6
7
8
I
P
O
I
I
I
I
Description
This pin is the input of an 8 - 450V linear
regulator.
This pin is the current sense pin used to
sense the FET current by means of an
external sense resistor.
Ground return for all internal circuitry.
This pin is the output GATE driver for an
external N-channel power MOSFET.
This is the PWM dimming input of the IC.
This is the power supply pin for all internal
circuits.
This pin is the linear dimming input of the IC.
A resistor connected between this pin and
GND programs the GATE off-time.
VIN
CS
GND
GATE
PWMD
VDD
LD
RT
2
7
FP7176
XXx-XXL
3
6
4
5
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Website:
http://www.feeling-tech.com.tw
Rev. 0.62
2/14
FP7176
Marking Information
XXx - XXL
FP7176
Halogen Free
Lot Number
Internal ID
Per - Half Month
Year
Halogen Free:
Halogen free product indicator
Lot Number:
Wafer lot number’s last two digits
For Example
Lot : 123456
XXx-56L
Internal ID:
Internal Identification Code
Per-Half Month:
Production period indicator in half month time unit
For Example : A → First Half Month of January
B → Second Half Month of January
C → First Half Month of February
D → Second Half Month of February
Year:
Production year’s last digit
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Website:
http://www.feeling-tech.com.tw
Rev. 0.62
3/14
FP7176
Ordering Information
Part Number
FP7176DR-G1
Operating Temperature
-25°C ~ +85°C
Package
SOP-8L
MOQ
2500 EA
Description
Tape & Reel
Absolute Maximum Ratings
Parameter
Power Supply Voltage
CS, LD, PWMD, GATE, RT
Allowable Power Dissipation
Junction to Ambient Thermal
Resistance
Operating Temperature
Storage Temperature
SOP-8L Lead Temperature
T
S
SOP-8L
(soldering, 10 sec)
P
D
θ
JA
-25
-40
SOP-8L T
A
≦+25°C
128
+125
+150
+260
Symbol
V
IN
V
DD
Conditions
V
IN
to GND
V
DD
to GND
Min.
Typ.
Max.
470
8
Unit
V
V
V
mW
°C / W
°C
°C
°C
-0.3
V
DD
-0.3V
630
IR Re-flow Soldering Curve
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Website:
http://www.feeling-tech.com.tw
Rev. 0.62
4/14
FP7176
Recommended Operating Conditions
Parameter
Supply Voltage
Operating Temperature
Symbol
V
IN
Conditions
Min.
8
-25
Typ.
Max.
450
125
Unit
V
°C
DC Electrical Characteristics
(V
IN
=12V,T
A
= 25°C, unless otherwise noted)
Parameter
Internal Regulator
Internally regulated voltage
V
DD
ΔV
DD,line
ΔV
DD,load
UVLO
VIN = 8V, I
DD(ext)
= 0, 500pF at
GATE; RT = 226kΩ, PWMD =
VDD
VIN = 8 – 450V, I
DD(ext)
=0,
500pF at GATE; RT = 226kΩ,
PWMD = VDD
I
DD(ext)
= 0 – 0.6mA, 500pF at
GATE; RT = 226kΩ, PWMD =
VDD
V
DD
rising
7.25
7.5
7.75
V
Symbol
Conditions
Min.
Typ.
Max.
Unit
Line regulation of VDD
0
-
1.0
V
Load regulation of V
DD
V
DD
undervoltage lockout
threshold
V
DD
undervoltage lockout
hysteresis
Maximum input current
0
5.75
6
500
0.8
100
6.25
mV
V
mV
mA
ΔUVLO V
DD
falling
I
IN,MAX
VIN = 8V, I
DD(ext)
= 0, 500pF at
GATE; RT = 226kΩ, PWMD =
VDD
PWM Dimming
Pin PWMD input low voltage
Pin PWMD input high voltage
V
EN(lo)
V
EN(hi)
V
IN
= 8 - 450V
V
IN
= 8 - 450V
1.8
0.9
V
V
Average Current Sense Logic
Current sense reference voltage
LD-to-CS voltage ratio
LD-to-CS voltage offset
CS threshold temp regulation
LD input voltage, shutdown
LD input voltage, enable
Current sense blanking interval
Minimum on-time
V
LD(OFF)
△
V
LD(OFF)
V
CS
A
V(LD)
AV
LD
(OFFSET)
271
0.182
Offset = V
CS
– A
V(LD)
‧V
LD
V
LD
=1.2V
0
283
0.188
15
5
150
200
mV
mV
mV
mV
mV
T
BLANK
T
ON(min)
CS=V
CS
+ 30mV
150
320
1000
ns
ns
Short Circuit Protection
Hiccup threshold voltage
Current limit delay CS - GATE
Short circuit hiccup time
Minimum on-time (short circuit)
V
CS
T
DELAY
T
HICCUP
T
ON(min)
CS=V
DD
CS=V
CS
+ 30mV
450
550
495
550
605
150
650
600
mV
ns
us
ns
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Website:
http://www.feeling-tech.com.tw
Rev. 0.62
5/14
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