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NCP5007SNT1 PDF даташит

Спецификация NCP5007SNT1 изготовлена ​​​​«ON» и имеет функцию, называемую «Compact Backlight LED Boost Driver».

Детали детали

Номер произв NCP5007SNT1
Описание Compact Backlight LED Boost Driver
Производители ON
логотип ON логотип 

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NCP5007SNT1 Даташит, Описание, Даташиты
NCP5007
Compact Backlight LED
Boost Driver
The NCP5007 is a high efficiency boost converter operating in a
current control loop, based on a PFM mode, to drive White LEDs. The
current mode regulation allows a uniform brightness of the LEDs. The
chip has been optimized for small ceramic capacitors and is capable of
supplying up to 1.0 W output power.
Features
Inductor Based Converter brings High Efficiency
Constant Output Current Regulation
2.7 to 5.5 V Input Voltage Range
Vout to 22 V Output Compliance Allows up to 5 LEDs to be Driven
in Series which Provides Automatic LED Current Matching
Built−in Output Overvoltage Protection
0.3 mA Standby Quiescent Current
Includes Dimming Function (PWM)
Enable Function Driven Directly from Low Battery Voltage Source
Thermal Shutdown Protection
All Pins are Fully ESD Protected
Low EMI Radiation
Pb−Free Package is Available
Typical Applications
LED Display Back Light Control
High Efficiency Step Up Converter
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5
1
MARKING
DIAGRAM
TSOP−5
5
(SOT23−5, SCR59−5) DCLYW
SN SUFFIX
CASE 483
1
DCL = Device Code
Y = Year
W = Work Week
PIN CONNECTIONS
FB 1
GND 2
EN 3
5 Vbat
4 Vout
(Top View)
Vbat
GND
U1
3 EN
Vbat
5
Vbat
L1
22 mH
C1
4.7 mF
GND
2
GND
1
FB
Vout 4
NCP5007
D1
MBR0530
C2
1.0 mF
ORDERING INFORMATION
Device
Package
Shipping
NCP5007SNT1 TSOP−5 3000 Tape & Reel
NCP5007SNT1G TSOP−5 3000 Tape & Reel
(Pb−Free)
†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.
GND
R1 D6 D5 D4 D3 D2
5.6 W
Figure 1. Typical Application
GND
© Semiconductor Components Industries, LLC, 2004
July, 2004 − Rev. 4
1
Publication Order Number:
NCP5007/D









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NCP5007SNT1 Даташит, Описание, Даташиты
Thermal
Shutdown
NCP5007
Current Sense
Vsense
Vbat
5 Vbat
EN 3
100 k
GND
CONTROLLER
FB 1
300 k
+200 mV
+
Band Gap
Figure 2. Block Diagram
4 Vout
Q1
GND
2 GND
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NCP5007SNT1 Даташит, Описание, Даташиты
NCP5007
PIN FUNCTION DESCRIPTION
Pin Symbol
Type
1 FB ANALOG
INPUT
2
GND
POWER
3 EN DIGITAL
INPUT
4 Vout POWER
5 Vbat POWER
Description
This pin provides the output current range adjustment by means of a sense resistor connected
to the analog control or with a PWM control. The dimming function can be achieved by applying
a PWM voltage technique to this pin (see Figure 29). The current output tolerance depends
upon the accuracy of this resistor. Using a "5% metal film resistor, or better, yields good output
current accuracy. Note: A built−in comparator switches OFF the DC−DC converter if the voltage
sensed across this pin and ground is higher than 700 mV typical.
This pin is the system ground for the NCP5007 and carries both the power and the analog
signals. High quality ground must be provided to avoid spikes and/or uncontrolled operation.
Care must be observed to avoid high−density current flow in a limited PCB copper track so a
robust ground plane connection is recommended.
This is an Active−High logic input which enables the boost converter. The built−in pulldown
resistor disables the device when the EN pin is left open. Note the logic switching level of this
input has been optimized to allow it to be driven from standard or 1.8 V CMOS logic levels.
The LED brightness can be controlled by applying a pulse width modulated signal to the enable
pin (see Figure 30).
This pin is the power side of the external inductor and must be connected to the external
Schottky diode. It provides the output current to the load. Since the boost converter operates in
a current loop mode, the output voltage can range up to +22 V but shall not exceed this limit.
However, if the voltage on this pin is higher than the OVP threshold (Over Voltage Protection)
the device enters a shutdown mode. To restart the chip, one must either apply a low to high logic
signal to the EN pin, or switch off the Vbat supply.
A capacitor must be used on Vout to avoid false triggering of the OVP (Overvoltage Protect)
circuit. This capacitor filters the noise created by the fast switching transients. In order to limit
the inrush current and still have acceptable startup time the capacitor value should range
between 1.0 mF and 8.2 mF max. To achieve high efficiency this capacitor should be ceramic
(ESR t 100 mW).
Care must be observed to avoid EMI through the PCB copper tracks connected to this pin.
The external voltage supply is connected to this pin. A high quality reservoir capacitor must be
connected across pin 5 and Ground to achieve the specified output voltage parameters. A
4.7 mF/6.3 V, low ESR capacitor must be connected as close as possible across pin 5 and
ground pin 2. The X5R or X7R ceramic MURATA types are recommended.
The return side of the external inductor shall be connected to this pin. Typical application will
use a 22 mH, size 1210, to handle the 10 to 100 mA output current range. When the desired
output current is above 20 mA, the inductor shall have an ESR v1.5 W to achieve good
efficiency over the Vbat range. The output current tolerance can be improved by using a larger
inductor value.
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Номер в каталогеОписаниеПроизводители
NCP5007SNT1Compact Backlight LED Boost DriverON
ON
NCP5007SNT1GCompact Backlight LED Boost DriverON
ON

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