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PDF NCP5007SNT1 Data sheet ( Hoja de datos )
| Número de pieza | NCP5007SNT1 | |
| Descripción | Compact Backlight LED Boost Driver | |
| Fabricantes | ON | |
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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
1 page  
NCP5007
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
1 EN 1.3 −
−
− − 0.4
EN Pull Down Resistor
Feedback Voltage Threshold
1 REN
4 FB
− 100 −
170 200 230
Output Current Stabilizes @ 5% time delay following a
5 Ioutdly − 100 −
DC−DC startup @ Vbat = 3.6 V, L = 22 mH, Iout = 20 mA
Internal Switch ON Resistor @ Tamb = +25°C
5 QRDSON
−
1.7
−
5. The overall tolerance depends upon the accuracy of the external resistor.
Unit
V
kW
mV
ms
W
THEORY OF 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 vary
depending upon the dynamic impedance presented by the
load.
Considering a high intensity LED, the output voltage can
range from a low of 6.4 V (two LED in series biased with a
low current), up to 22 V, the maximum the chip can sustain
continuously. The basic DC−DC structure is depicted in
Figure 3.
With a 22 V operating voltage capability, the power
device Q1 can accommodate a high voltage source without
any leakage current degradation.
Vbat
POR
Vdsense
L1
22 mH
4
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
1
R2
xR Vs
GND
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5
5 Page 
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
2.7
NCP5007
TYPICAL OPERATING CHARACTERISTICS
(All curve conditions: L = 22 mH, Cin = 4.7 mF, Cout = 1.0 mF, Typical curve @ Ta = +25°C)
−40°C thru 125°C
2.5
2.0 2 LED
3.3 3.9 4.5
Vbat, BATTERY VOLTAGE (V)
Figure 20. Standby Current
5.1
5.5
1.5
3 LED
1.0 4 LED
5 LED
0.5
0
2.5 3.0 3.5 4.0 4.5 5.0
Vbat (V)
Figure 21. Typical Operating Frequency
5.5
26
25 Vbat = 2.7V
Vbat = 5.5V
24
Vbat = 3.6V
23
22
−40 −20
0 20 40 60 80 100 120130
TEMPERATURE(°C)
Figure 22. Overvoltage Protection
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11
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| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet NCP5007SNT1.PDF ] | |
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