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PDF NCP5010 Data sheet ( Hoja de datos )
| Número de pieza | NCP5010 | |
| Descripción | Boost Converter | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de NCP5010 (archivo pdf) en la parte inferior de esta página. Total 18 Páginas | ||
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NCP5010
500 mW Boost Converter for
White LEDs
The NCP5010 is a fixed frequency PWM boost converter with
integrated rectification optimized for constant current applications
such as driving white LEDs. This device features small size, minimal
external components and high−efficiency for use in portable
applications and is capable of providing up to 500 mW output power
to 2−5 series connected white LEDs. A single resistor sets the LED
current and the CTRL pin can be pulse width modulated (PWM) to
reduce the LED Current.
The device includes True−Cutoff circuitry to disconnect the load
from the battery when the device is put into standby mode. To protect
the device, an output overvoltage protection, and short circuit
protection have been incorporated. The NCP5010 is housed in a low
profile, space efficient 1.7 x 1.7 mm Flip−Chip package. The device
has been optimized for use with small inductors and ceramic
capacitors.
Features
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MARKING
DIAGRAM
A1
8−Pin Flip−Chip
FC SUFFIX
1 CASE 499AJ
DAXG
AYWW
DAX
G
A
Y
WW
= Specific Device Code
= Pb−Free Package
= Assembly Location
= Year
= Work Week
• 2.7 to 5.5 V Input Voltage Range
• Efficiency: 84% for 5 LED (VF = 3.5 V by LED) at 30 mA and
4.2 V VIN
• Low Noise 1 MHz PWM DC−DC Converter
• Open LED Protection and Short Circuit Protection www.DataSheet4U.com
• Serial LEDs Architecture for Uniform Current Matching
• 1 mA Shutdown Current Facility with True−Cutoff
• Very Small 8−Pin Flip−Chip 1.7 x 1.7 mm Package
• This is a Pb−Free Device
PIN CONNECTIONS
A1 A2 A3
AGND CTRL NC
B1 B3
VIN FB
C1 C2 C3
VOUT SW PGND
Typical Applications
Top View
• White LED Backlighting for Small Color LCD Displays
• Cellular Phones
• Digital Cameras
• MP3 Players
• High Efficiency Step−up Converter
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 16 of this data sheet.
90
80 VOUT = 5 LED (18 V)
70 VOUT = 3 LED (11 V)
60
50
40
30
20
10
VIN = 4.2 V
0
1 10 100
IOUT (mA)
Figure 1. Efficiency vs. Output Current
© Semiconductor Components Industries, LLC, 2006
August, 2006 − Rev. 1
1
Publication Order Number:
NCP5010/D
1 page  
NCP5010
TYPICAL OPERATING CHARACTERISTICS
Condition: Efficiency = 100 x (Number of LED stacked x VLED x ILED)/PIN
90 90
80 80
70
VIN = 2.7 V
VIN = 3.3 V
VIN = 4.2 V
70
VIN = 2.7 V
VIN = 3.3 V
VIN = 4.2 V
60 60
50
0 10 20 30 40 50 60 70
IOUT (mA)
Figure 3. Efficiency vs. Current @ 3 LEDS (10.5 V)
L = Coilcraft DT1608C−223
90
50
0 10 20 30 40 50 60 70
IOUT (mA)
Figure 4. Efficiency vs. Current @ 3 LEDS (10.5 V)
L = TDK VLF4012AT−220
90
80
70
VIN = 2.7 V
VIN = 3.3 V
VIN = 4.2 V
60
80
70
VIN = 2.7 V
VIN = 3.3 V
VIN = 4.2 V
60
50
0 10 20 30 40 50 60 70
IOUT (mA)
Figure 5. Efficiency vs. Current @ 4 LEDS (14 V)
L = Coilcraft DT1608C−223
90
50
0 10 20 30 40 50 60 70
IOUT (mA)
Figure 6. Efficiency vs. Current @ 4 LEDS (14 V)
L = TDK VLF4012AT−220
90
80
VIN = 2.7 V
VIN = 3.3 V
VIN = 4.2 V
70
60
80
70
VIN = 2.7 V
VIN = 3.3 V
VIN = 4.2 V
60
50
0 10 20 30 40 50 60 70
IOUT (mA)
Figure 7. Efficiency vs. Current @ 5 LEDS (17.5 V)
L = Coilcraft DT1608C−223
50
0 10 20 30 40 50 60 70
IOUT (mA)
Figure 8. Efficiency vs. Current @ 5 LEDS (17.5 V)
L = TDK VLF4012AT−220
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5
5 Page 
NCP5010
Finally an acceptable DCR must be selected regarding
losses in the coil and must be lower than 1.4 W to limit
excessive voltage drop. In addition, as DCR is reduced,
overall efficiency will improve. Some recommended
inductors include but are not limited to:
TDK VLF4012AT−220MR51
TDK VLP4612T−220MR34
TDK VLP5610T−220MR45
Coilcraft LPO6610−223M
Coilcraft DO1605T−223MX
Coilcraft DT1608C−223
Capacitor Selection
To minimize the output ripple, a low ESR multi−layer
ceramic capacitor type X5R or equivalent should be
selected. For LED driver applications a 1 mF (min) 25 V is
adequate. The NCP5010 can be operated in a voltage mode
configuration (see Figure 34) for applications such as
OLED power. Under these conditions, COUT can be
increased to 2.2 mF, 25 V or more to reduce the output
ripple.
The input needs to be bypassed by a X5R or an equivalent
low ESR ceramic capacitor near the VIN pin. A 1 mF, 6.3 V
is enough for most applications. However, if the connection
between VIN and the battery is too long then a 4.7 mF or
higher ceramic capacitor may be needed. Some
recommended capacitors include but are not limited to:
TDK C1608X5R1E105MT
TDK C2012X5R1E105MT
TDK C1608X5R0J105MT
TDK C2012X5R1E225MT
Murata GRM185R61A105KE36D
Murata GRM188R60J475KE19D
Murata GRM216R61E105KA12D
Short−Circuit Protection
If VOUT is falls below 50% of VIN then a short−circuit
condition is detected. When this event is detected, the
PWM circuitry is disabled and the NMOS power switch is
not turned on. Power will be supplied to the load through
the inductor, rectifier and high side switch. Once VOUT
reaches 66% of VIN, then the PWM circuitry is enabled. In
normal conditions when the device is enabled by an active
high signal on CTRL, the short circuit condition continues
until the output capacitor is charged by the limited current
up to 66% of VIN.
VOUT
2/3 VIN
1/2 VIN
Normal
Running
SC Short−Circuit Condition End of Short−Circuit
Occurs Current limited at 20mA Detected Converter
Converter in Standby Starts Again
T
Figure 27. Example of the VOUT Voltage Behavior
When Short−Circuit Arises
Overvoltage Protection (OVP)
If there is an open load condition such as a loose
connection to the White LED string, the converter will
provide current to the Cout capacitor and the voltage at the
output will rise rapidly. This could cause damage to the part
if there was not some external clamping Zener clamping
circuit. To eliminate the need for these external
components, the NCP5010 incorporates an OVP circuit
which monitors the output voltage with a resistive divider
network and a comparator and voltage reference. If the
output reaches 22 V (nominal), the OVP circuit will detect
a fault and inhibit PWM operation. This comparator has
1 V of hysteresis so when the load is reconnected and the
voltage drops below 21 V, the PWM operation will resume
automatically. The 22 V OVP threshold allows the use of
25 V ceramic capacitors for the output filter capacitor.
Undervoltage Lock Out (UVLO)
To ensure proper operation under all conditions, the
device has a built−in undervoltage lock out (UVLO)
circuit. During power−up, the device will remain disabled
until the input voltage exceeds 2.4 V nominal. This circuit
has 200 mV of hysteresis to provide noise immunity to
transient conditions.
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11
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| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet NCP5010.PDF ] | |
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