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PDF PAM2863 Data sheet ( Hoja de datos )
| Número de pieza | PAM2863 | |
| Descripción | 2A LED Driver | |
| Fabricantes | Power Analog Micoelectronics | |
| Logotipo |  |
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Features
nSimple low parts count
nInternal 40V NDMOS switch
n2A output current
nSingle pin on/off and brightness control
Using DC voltage or PWM
nSoft-start
nHigh efficiency (up to 97%)
nWide input voltage range: 4.5V to 40V
nOutput shutdown
nOpen LED Protection
nShort LED Protection
nUp to 1MHz switching frequency
nTypical 5% output current accuracy
nPb-free SOP-8(EP) Packages
Applications
nHigh end LED flashlight
nLED light bar
PAM2863
2A LED Driver with Internal Switch
Description
The PAM2863 is a continuous mode inductive
step-down converter, designed for driving single
or multiple series connected LEDs efficiently from
a voltage source higher than the LED voltage. The
device operates from an input supply between
4.5V and 40V and provides an externally
adjustable output current of up to 2A. Depending
upon supply voltage and external components,
this can provide up to 30 watts of output power.
The PAM2863 includes the output switch and a
high-side output current sensing circuit, which
uses an external resistor to set the nominal
average output current.
Output current can be adjusted below the set
value, by applying an external control signal to the
VSET pin.
The VSET pin will accept either a DC voltage or a
PWM waveform.
The soft-start time can be increased using an
external capacitor from the VSET pin to ground.
Applying a voltage of 0.2V or lower to the VSET
pin turns the output off and switches the device
into a low current standby state.
Typical Application
VIN(4.5V-40V)
C1
22μF
D1 SS34 3A/40V
Rs
0.05Ω
VIN ISENSE
PAM2863
VSET
GND
LX
L1
33μH
Power Analog Microelectronics,Inc
www.poweranalog.com
1
09/2010 Rev1.0
1 page  
PAM2863
2A LED Driver with Internal Switch
Electrical Characteristic
TA=25°C, VIN=16V, unless otherwise noted.
Parameter
Input voltage
Output current
Shutdown current
Quiescent current without
switching
Mean current sense threshold
voltage
Sense threshold hysteresis
Isense pin input current
Vset range on VSET pin
DC voltage on VSET pin to enable
DC voltage on VSET pin to disable
LX switch on resistance
LX switch leakage current
Soft start time
Operating frequency
Recommended minimum switch
ON time
Recommended maximum switch
frequency
Max duty circle
Recommended duty cycle range
Internal comparator propagation
delay
Over temperature protection
Temp protection hysteresis
Current limit
Symbol
Vin
ILED
ISD
IQ
Vsense
Vsense_hys
Isense
Ven
Venon
venoff
RLX
ILX(leak)
Tss
FLX
Ton_rec
FLXmax
DLX
TPD*
TOTP
TOTP_hys
IXLmax
Condition
RS=0.1Ω
RS=0.05Ω
VSET pin grounded
VSET pin floating, Vin=16V
Measured on Isense pin with
respect to VIN
Vsense = Vin – 0.1
For DC dimming
Ven rising
Ven falling
@ILX=100mA
Vin=16V, Cen = 1nF
Vi=16V, Vo=9.6V (3 LEDS),
L=47µH, ΔI=0.25A (ILED=1A)
For 4% accuracy
Peak inductor current
Min
4.5
95
0.3
25
*parameters are not tested at production,but guaranteed by design.
Note: Vsense: level A: 95mV to 100mV; level B:100mV to 105mV
Typ
1
2
20
0.6
100
±13
8
0.25
0.2
0.3
1.5
233
500
98
45
150
40
2.5
Max Units
40 V
A
A
40 µA
mA
105 mV
%
µA
2.5 V
V
V
Ω
5 µA
ms
kHz
ns
1.0 MHz
%
75 %
ns
°C
°C
A
Power Analog Microelectronics,Inc
www.poweranalog.com
5
09/2010 Rev1.0
5 Page 
Outline Dimension
SOP-8(EP)
PAM2863
2A LED Driver with Internal Switch
Power Analog Microelectronics,Inc
www.poweranalog.com
11
09/2010 Rev1.0
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet PAM2863.PDF ] | |
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