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PDF NCP9003 Data sheet ( Hoja de datos )

Número de pieza NCP9003
Descripción Compact Backlight LED Boost Driver
Fabricantes ON Semiconductor 
Logotipo ON Semiconductor Logotipo



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No Preview Available ! NCP9003 Hoja de datos, Descripción, Manual

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NCP9003
Compact Backlight LED
Boost Driver
The NCP9003 is a high efficiency boost converter operating in
current loop, based on a PFM mode, to drive White LED. The current
mode regulation allows a uniform brightness of the LEDs. The chip
has been optimized for small ceramic capacitors, capable to supply
up to 1.0 W output power.
Features
2.7 to 5.5 V Input Voltage Range
Vout to 24 V Output Compliance Allows up to 5 LEDs Drive in
Series
Builtin Overvoltage Protection
Full EMI Immunity
Inductor Based Converter brings up to 90% Efficiency
Constant Output Current Regulation
0.3 mA Standby Quiescent Current
Includes Dimming Function (PWM)
Enable Function Driven Directly from Low Battery Voltage Source
Automatic LEDs Current Matching
Thermal Shutdown Protection
All Pins are Fully ESD Protected
Low EMI Radiation
PbFree Package is Available
Typical Applications
LED Display Back Light Control
Keyboard Back Light
High Efficiency Step Up Converter
http://onsemi.com
5
1
TSOP5
SN SUFFIX
CASE 483
MARKING
DIAGRAM
5
DBNAYWG
G
1
DBN = Specific Device Code
A = Assembly Location
Y = Year
W = Work Week
G = PbFree Package
(Note: Microdot may be in either location)
PIN CONNECTIONS
Vout 1
GND 2
5 Vbat
FB 3
4 EN
(Top View)
ORDERING INFORMATION
Device
Package
Shipping
NCP9003SNT1G TSOP5 3000 Tape & Reel
(PbFree)
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specifications
Brochure, BRD8011/D.
© Semiconductor Components Industries, LLC, 2006
August, 2006 Rev. 1
1
Publication Order Number:
NCP9003/D

1 page




NCP9003 pdf
NCP9003
ANALOG SECTION (Typical values are referenced to TA = +25°C, Min & Max values are referenced 25°C to +85°C ambient
temperature, unless otherwise noted.)
Rating
Pin Symbol Min Typ Max
High Level Input Voltage
Low Level Input Voltage
4 EN 1.3 − −
− − 0.4
EN Pull Down Resistor
Feedback Voltage Threshold
4 REN 100
3 FB 185 200 225
Output Current Stabilization Time Delay following a DC/DC Startup,
@ Vbat = 3.60 V, L = 22 mH, Iout = 20 mA
Internal Switch ON Resistor @ Tamb = +25°C
5. The overall tolerance depends upon the accuracy of the external resistor.
1
1
Ioutdly
QRDSON
100
1.7
Unit
V
V
kW
mV
ms
W
ESD PROTECTION
The NCP9003 includes silicon devices to protect the pins
against the ESD spikes voltages. To cope with the different
ESD voltages developed in the applications, the builtin
structures have been designed to handle "2.0 kVin Human
Body Model (HBM) and "200 V in Machine Model (MM)
on each pin.
DC/DC OPERATION
The DC/DC converter is designed to supply a constant
current to the external load, the circuit being powered from
a standard battery supply. Since the regulation is made by
means of a current loop, the output voltage will varies
depending upon the dynamic impedance presented by the
load.
Considering high intensity LED, the output voltage can
range from a low 6.40 V (two LED in series biased with a
low current), up to 21 V, the voltage compliance the chip
can sustain continuously.
The basic DC/DC structure is depicted in Figure 3. With
a 28 V maximum rating voltage capability, the power
device can accommodate high voltage source without any
leakage current downgrading.
Vbat
POR
Vdsense
L1
22 mH
1
D1
Q1 Vds
LOGIC
CONTROL
TIME_OUT
ZERO_CROSSING
RESET
Vdsense
+
V(Ipeak)
+
GND
R1
C2
Vref
GND
Figure 3. Basic DC/DC Converter Structure
GND
3
R2
xR Vs
GND
http://onsemi.com
5

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NCP9003 arduino
NCP9003
TYPICAL OPERATING WAVEFORMS
Vout
Inductor
Current
Conditions: Vbat = 3.6 V, Lout = 22 mH, 5 LED, Iout = 15 mA
Figure 20. Typical Power Up Response
Vload
Inductor
Current
Conditions: Vbat = 3.6 V, Lout = 22 mH, 5 LED, Iout = 15 mA
Figure 21. Typical StartUp Inductor Current and Output Voltage
http://onsemi.com
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