FP7179
LED Driver with Average-Mode Constant Current Control
General Description
The FP7179 is an average current mode control LED driver IC operating in a constant off-time
mode. FP7179 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 FP7179 can be powered from an 8.0 - 450V supply. PWM & Linear dimming input is provided
that accepts an external control TTL compatible signal. The output current can be programmed by an
internal 277mV reference.
Features
Fast Average Current Control
Internal 8 to 450V Linear Regulator
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
UP to 450V
LED
Load
GATE
VDD
FP7179
GND
DIM
Linear & PWM
Dimming
CS
VIN
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. 0.63
1/14
FP7179
Function Block Diagram
VIN
Regulator
Internal
supply
POR
UVLO
VDD
DIM
150mV/200mV
Average Current
Logic Control
GATE
MIN (V
LD
∙ 0.185, 0.277V
GND
LEB
550mV
SCP
T
OFF
Timer
OTP
CS
Pin Descriptions
SOT23-6L
Top View
Name
GATE
6
No. I / O
1
2
3
4
5
6
O
P
I
P
I
I
Description
This pin is the output GATE driver for an
external N-channel power MOSFET.
Ground return for all internal circuitry.
This pin is the current sense pin used to
sense the FET current by means of an
external sense resistor.
This pin is the input of an 8 - 450V linear
regulator.
This pin is the linear & PWM dimming input
of the IC.
This is the power supply pin for all internal
circuits.
BQXXX
GATE
GND
CS
1
VDD
DIM
VIN
GND
CS
VIN
DIM
VDD
2
5
3
4
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. 0.63
2/14
FP7179
Marking Information
SOT23-6L
BQXXX
Lot Number
Year
Part Number Code
Lot Number:
Wafer lot number’s last two digits
For Example: XX486
86
Year:
Production year’s last digit
Part Number Code:
Part number identification code for this product. It should be always “BQ”.
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. 0.63
3/14
FP7179
Ordering Information
Part Number
FP7179LR-G1
Code
BQ
Operating Temperature
-25°C ~ +85°C
Package
SOT23-6L
MOQ
3000 EA
Description
Tape & Reel
Absolute Maximum Ratings
Parameter
Power Supply Voltage
CS, DIM, GATE
Allowable Power Dissipation
Junction to Ambient Thermal
Resistance
Operating Temperature
Storage Temperature
SOT23-6L Lead Temperature
T
S
SOT23-6L
(soldering, 10 sec)
P
D
θ
JA
-25
-40
SOT23-6L T
A
≦+25°C
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
455
220
+125
+150
+260
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. 0.63
4/14
FP7179
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
Line regulation of VDD
Load regulation of V
DD
V
DD
undervoltage lockout
threshold
V
DD
undervoltage lockout
hysteresis
Maximum input current
V
DD
ΔV
DD,line
ΔV
DD,load
UVLO
ΔUVLO
I
IN,MAX
VIN = 8V, I
DD(ext)
= 0, 500pF at
GATE;DIM = VDD
VIN = 8 – 450V, I
DD(ext)
=0, 500pF
at GATE; DIM = VDD
I
DD(ext)
= 0 – 0.6mA, 500pF at
GATE; DIM = VDD
V
DD
rising
V
DD
falling
VIN = 8V, I
DD(ext)
= 0, 500pF at
GATE;DIM = VDD
7.25
0
0
5.25
5.5
500
0.8
7.5
-
7.75
1.0
100
5.75
V
V
mV
V
mV
mA
Symbol
Conditions
Min.
Typ.
Max.
Unit
Average Current Sense Logic
Current sense reference voltage
DIM-to-CS voltage ratio
DIM-to-CS voltage offset
CS threshold temp regulation
DIM input voltage, shutdown
DIM input voltage, enable
Current sense blanking interval
Minimum steady-state duty cycle
V
DIM(OFF)
△
V
DIM(OFF)
V
CS
A
V(DIM)
AV
DIM
(OFFSET)
271
0.182
Offset = V
CS
– A
V(DIM)
‧V
DIM
V
DIM
=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
GATE Driver
GATE sourcing current
GATE sinking current
GATE output rise time
GATE output fall time
I
SOURCE
I
SINK
t
RISE
t
FALL
V
GATE
= 0V, V
DD
= 7.5V
V
GATE
= V
DD
, V
DD
= 7.5V
C
GATE
= 500pF, V
DD
= 7.5V
C
GATE
= 500pF, V
DD
= 7.5V
165
165
30
30
50
50
mA
mA
ns
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. 0.63
5/14
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