Power APE1612 1.9a fixed frequency white led driver Datasheet

Advanced Power
Electronics Corp.
APE1612
1.9A FIXED FREQUENCY WHITE LED DRIVER
FEATURES
DESCRIPTION
The APE1612 is a step-up converter designed for
driving up to 8 series white LEDs for backlighting application.
The APE1612 uses current mode, 1.2MHz fixed frequency
architecture to regulate the LED current, which is set through
an external current sense resistor. Its low 300mV feedback
voltage reduces power loss and improves efficiency. The OV
pin monitors the output voltage and turns off the converter if
an over-voltage condition is present due to an open circuit
condition. The APE1612 includes under-voltage lockout,
current limiting and thermal shutdown protection preventing
damage in the event of an output overload. The driver is
available in TSOT-26 packages.
2.5V to 5.5 V Operating Input Voltage Rang
Drives up to 8 Series White LEDs
1.2MHz Fixed Switching Frequency
Wide Range for PWM Dimming (200Hz to 200KHz)
Internal 1.9A Switching Current Limit
Over Voltage Protection (OVP)
Internal Soft-start Function
Current Limit and Thermal Shutdown Protection
Under Voltage Lockout
Available in the TSOT-26 Packages
TYPICAL APPLICATION
1. 8 series LED application
VIN=5V
L1
4.7uH
D1
B240A
U1
ON
C1
4.7uF
OFF
VCC
SW
EN
OV
GND
FB
8-WLEDs
C2
1uF
APE1612
R3
ILED= VFB/R3, VFB=300mV
2. LED Dimming application
VIN=5V
L1
4.7uH
D1
B240A
U1
C1
4.7uF
Dimming
200~200KHz
VCC
SW
EN
OV
GND
FB
8-WLEDs
C2
1uF
APE1612
R3
ILED= VFB/R3, VFB=300mV
Data and specifications subject to change without notice
1
201203211
Advanced Power
Electronics Corp.
APE1612
ABSOLUTE MAXIMUM RATINGS (at TA=25°C)
VCC Pin Voltage (VCC) ------------------------------------ GND - 0.3 to GND + 6V
EN, FB, OV Pin Voltage -----------------------------------
GND - 0.3 to VCC + 0.3V
SW Pin Voltage (VSW ) ------------------------------------- 30V
Power Dissipation(PD) ------------------------------------- ( TJ-TA ) / Rthja mW
Storage Temperature Range(TST) ---------------------- -65°C To 150°C
Operating Junction Temperature Range(TOP) ------- -40°C To 125°C
Thermal Resistance from Junction to Case(RthJC)
180°C/W
Thermal Resistance from Junction to Ambient(RthJA)
250°C/W
2
Note: RthJA is measured with the PCB copper area of approximately 1 in (Multi-layer)
ORDERING / PACKAGE INFORMATION
(Top View)
APE1612 X
SW
1
6
VCC
Package Type
GND
2
5
OV
TY : TSOT-26
FB
3
4
EN
TSOT-26
ELECTRICAL SPECIFICATIONS (VCC=5V, IOUT = 20mA, TA = 25oC, unless otherwise noted)
Parameter
SYM
TEST CONDITION
MIN
TYP
MAX
UNITS
Input Voltage Range
VCC
2.5
-
5.5
V
Step-Up Voltage Range
VOUT
3
-
27
V
OV Sense Voltage
VOV
27.5
29
30.5
V
Under Voltage Lockout
UVLO
-
2.25
2.45
V
-
100
-
mV
VFB
285
300
315
mV
Logic-High Voltage
VIH
1.4
-
-
V
Logic-Low Voltage
VIL
-
-
0.4
V
Rising
UVLO Hysteresis
Feedback Voltage
EN Threshold
EN Hysteresis
Operating Quiescent Current
Shutdown Current
N-Channel MOSFET Current Limit
(Note1)
MOSFET On-resistance
Maximum Duty Cycle
(Note1)
ICCQ
IOUT= 0mA, VFB =0.5V
-
200
170
-
mV
μA
ISD
VEN=0V, tEN > 20ms
-
-
1
μA
ILIM
Duty=50%
-
1.9
-
A
VCC=3V, ISW =1A
-
650
-
VCC=5V, ISW =1A
-
500
-
85
90
-
RDS(on)
DMAX
VCC = 3V to 5V
mΩ
%
-
1
-
%
Switching Frequency
FOSC
0.9
1.2
1.5
MHz
Dimming Clock Rate
FDIM
0.2
-
200
KHz
Line Regulation
2
Advanced Power
Electronics Corp.
APE1612
ELECTRICAL SPECIFICATIONS
Parameter
SYM
FB Input Leakage Current
IFB-LKG
SW Leakage Current
ISWL
MIN
TYP
MAX
UNITS
VFB = 0.5V
-
0.01
100
nA
VLX = 27V, VFB =0.5V
-
-
1
µA
TEST CONDITION
IEN-LKG1
VEN= VCC
-
1.5
3
μA
IEN-LKG2
VEN= GND
-
0.01
0.1
μA
TSHDN
-
10
-
mS
Thermal Shutdown
TSD
-
150
-
Thermal Shutdown Hysteresis
TSH
-
30
-
EN Input Leakage Current
Shutdown Delay
o
C
Note1 : Guaranteed by design.
PIN DESCRIPTIONS
PIN SYMBOL
VCC
PIN DESCRIPTION
Power Input Pin
EN
Enable with dimming pin, Internal pull-high.
FB
Feedback Pin; Put a resistor to GND to setting the current
Ground Pin
GND
OV
OVP Sense Pin
SW
Switch Output Pin
BLOCK DIAGRAM
VCC
UVLO
EN
Soft Start
Reference
1.238V
Enable
Logic
10ms
Shutdown
Summing
Comparator
300mV
FB
Error
Amplifier
OVP
OV
Thermal
Shutdown
SW
Control and
Driver Logic
N-MOS
Oscillator
1.2MHz
Slope
Compensation
Current
Sense
GND
3
Advanced Power
Electronics Corp.
APE1612
APPLICATION INFORMATION
Setting the ILED Current
Application circuit item shows the basic application circuit with APE1612 adjustable
output version. The external resistor sets the LED output current according to the following
equation:
⎛ 0.3V ⎞
I LED = ⎜
⎟
⎝ R3 ⎠
I LED
R3
20mA
15Ω
6mW
350mA
0.857Ω
105mW
Over Voltage Protection
OV measure the output voltage for open circuit protection. Connect OV pin to the
output at the top of the LED string. If VOUT above 29V, the OVP protection is happened
that stops the internal driver until VOUT below 29V.
Under Voltage Lockout (UVLO)
To avoid mis-operation of the device at low input voltages an under voltage lockout is
included that disables the device, if the input voltage falls below (2.25V-100mV).
Input Capacitor Selection
The input capacitor reduces the surge current drawn from the input and switching
noise from the device. The input capacitor impedance at the switching frequency shall be
less than input source impedance to prevent high frequency switching current passing to
the input. A low ESR input capacitor sized for maximum RMS current must be used.
Ceramic capacitors with X5R or X7R dielectrics are highly recommended because of their
low ESR and small temperature coefficients. A 4.7 µ F ceramic capacitor for most
applications is sufficient. For a lower output power requirement application, this value can
be decreased.
Output Capacitor Selection
The output capacitor is required to keep the output voltage ripple small and to ensure
regulation loop stability. The output capacitor must have low impedance at the switching
frequency. Ceramic capacitors with X5R or X7R dielectrics are recommended due to their
low ESR and high ripple current. A 1uF ceramic capacitors works for most of the
applications. Higher capacitor values can be used to improve the load transient response.
4
Advanced Power
Electronics Corp.
APE1612
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency vs. Output Current
Efficiency vs. Input Voltage
Output Voltage vs. Output Current
Quiescent Current vs. Input Voltage
Frequency vs. Input Voltage
Frequency vs. Temperature
5
Advanced Power
Electronics Corp.
APE1612
TYPICAL PERFORMANCE CHARACTERISTICS
Reference Voltage vs. Input Voltage
Reference Voltage vs. Temperature
LED Current vs. Duty
Enable Threshold vs. Input Voltage
Power ON from VIN
Power ON from EN
6
Advanced Power
Electronics Corp.
APE1612
TYPICAL PERFORMANCE CHARACTERISTICS
Steady State Operation
Normal Operation into OVP
( VOUT, IOUT: measured by AC coupled mode )
PWM Dimming from EN (200Hz)
PWM Dimming from EN (20KHz)
7
Advanced Power
Electronics Corp.
APE1612
MARKING INFORMATION
TSOT-26
JAYWS
Part Number : JA
Week:
A~Z : 01~26
a~z : 27~52
ID Code : Internal
Year :
A = 2010
1 = 2011
:
:
8
Advanced Power
Electronics Corp.
APE1612
PACKAGE OUTLINES
TSOT-26
θ
D
L
E1
E
L1
R
b
e
C
L2
y
A1
A
A2
e1
Dimensions in Millimeters
Min.
Nom.
Max.
A
1.10
A1
0.00
0.10
A2
0.70
0.90
1.00
b
0.30
0.40
0.50
C
0.08
0.14
0.20
D
2.80
2.90
3.00
E
2.60
2.80
3.00
E1
1.50
1.60
1.70
e
0.95 BSC.
e1
1.90 BSC.
L
0.30
0.45
0.60
L1
0.60 REF.
L2
0.25 BSC.
y
0.10
R
0.10
o
θ
0
8o
JEDEC outline: MO-193 AA
Symbol
Dimensions in Inches
Min.
Nom.
Max.
0.043
0
0.004
0.028
0.035
0.039
0.012
0.016
0.020
0.003
0.006
0.008
0.110
0.114
0.118
0.102
0.110
0.118
0.059
0.063
0.067
0.037 BSC.
0.075 BSC.
0.012
0.018
0.024
0.024 REF.
0.010 BSC.
0.004
0.004
o
0
8o
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