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PDF NCP1403 Data sheet ( Hoja de datos )
| Número de pieza | NCP1403 | |
| Descripción | PFM Step-Up DC-DC Converter | |
| Fabricantes | ON Semiconductor | |
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NCP1403
15 V/50 mA PFM Step-Up
DC-DC Converter
The NCP1403 is a monolithic PFM step-up DC-DC converter. This
device is designed to boost a single Lithium or two cell AA/AAA
battery voltage up to 15 V (with internal MOSFET) output for
handheld applications. A pullup Chip Enable feature is built with this
device to extend battery-operating life. Besides, the device can also be
incorporated in step-down, and voltage-inverting configurations.
This device is available in space-saving TSOP-5 package.
Features
•ă82% Efficiency at VOUT = 15 V, IOUT = 50 mA, VIN = 5.0 V
•ă78% Efficiency at VOUT = 15 V, IOUT = 30 mA, VIN = 3.6 V
•ăLow Operating Current of 19 mA (No Switching)
•ăLow Shutdown Current of 0.3 mA
•ăLow Startup Voltage of 1.3 V Typical at 0 mA
•ăOutput Voltage up to 15 V with Built-in 16 V MOSFET Switch
•ăPFM Switching Frequency up to 300 kHz
•ăChip Enable
•ăLow Profile and Minimum External Parts
•ăMicro Miniature TSOP-5 Package
•ăPb-Free Package is Available
Typical Applications
•ăLCD Bias
•ăPersonal Digital Assistants (PDA)
•ăDigital Still Camera
•ăHandheld Games
•ăHand-held Instrument
http://onsemi.com
5
1
TSOP-5
SN SUFFIX
CASE 483
MARKING DIAGRAM AND
PIN CONNECTIONS
CE 1
FB 2
VDD 3
5 LX
4 GND
(Top View)
DCE =Specific Device Marking
A = Assembly Location
Y = Year
W = Work Week
G = Pb-Free Package
(Note: Microdot may be in either location)
ORDERING INFORMATION
Device
Package
Shipping†
NCP1403SNT1
TSOP-5 3000/Tape & Reel
NCP1403SNT1G 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.
©Ă Semiconductor Components Industries, LLC, 2007
May, 2007 - Rev. 6
1
Publication Order Number:
NCP1403/D
1 page  
NCP1403
TYPICAL CHARACTERISTICS
17.0
16.5
16.0
15.5
L = 47 mH
VOUT = 15 V
COUT = 33 mF
TA = 25°C
Figure 1
15.0
VIN = 5.5
V
14.5
1.8 V 2.4 V
3.6 V
14.0 3.0 V
4.0 V
5.0 V
13.5
13.0
0
10 20 30 40 50 60 70
IOUT, OUTPUT CURRENT (mA)
Figure 4. Output Voltage versus Output
Current (VOUT = 15 V)
80
14.0
13.5
13.0
12.5
L = 47 mH
VOUT = 12 V
COUT = 33 mF
TA = 25°C
Figure 1
12.0
11.5
11.0
10.5 1.8 V
2.4 V
3.0 V
3.6 V
VIN = 5.5
V
5.0 V
4.0 V
10.0
0 10 20 30 40 50 60 70 80
IOUT, OUTPUT CURRENT (mA)
Figure 6. Output Voltage versus Output
Current (VOUT = 12 V)
15.4
100
80
3.0 V 3.6 V
2.4 V
60 1.8 V
4.0 V
Vin = 5.5 V
5.0 V
40
L = 47 mH
VOUT = 15 V
COUT = 33 mF
20 TA = 25°C
Figure 1
0
0 10 20 30 40 50 60 70 80
IOUT, OUTPUT CURRENT (mA)
Figure 5. Efficiency versus Output Current
(VOUT = 15 V)
100
80
2.4 V
1.8 V
60
3.0 V
3.6 V
VIN = 5.5
4.0
V
V
5.0
V
L = 47 mH
VOUT = 12 V
40 COUT = 33 mF
TA = 25°C
Figure 1
20
0 10 20 30 40 50 60 70 80
IOUT, OUTPUT CURRENT (mA)
Figure 7. Efficiency versus Output Current
(VOUT = 12 V)
12.4
15.2
15.0
IOUT = 5 mA
14.8
14.6
IOUT = 0 mA
L = 47 mH
VOUT = 15 V
COUT = 33 mF
TA = 25°C
Figure 1
14.4
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
Vin, INPUT VOLTAGE (V)
Figure 8. Output Voltage versus Input Voltage
(VOUT = 15 V)
12.2
12.0
IOUT = 5 mA
11.8
IOUT = 0 mA
11.6
L = 47 mH
VOUT = 12 V
COUT = 33 mF
TA = 25°C
Figure 1
11.4
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
Vin, INPUT VOLTAGE (V)
Figure 9. Output Voltage versus Input Voltage
(VOUT = 12 V)
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5
5 Page 
NCP1403
Output Voltage Higher than 15 V
NCP1403 can be used to generate output voltage higher
than 15 V by adding an external high voltage N-Channel
MOSFET in series with the internal MOSFET switch as
shown in Figure 33. The drain-to-source breakdown
voltage of the external MOSFET must be at least 1ĂV higher
than the output voltage. The diode D1 helps the external
MOSFET to turn off and ensures that most of the voltage
across the external MOSFET during the switch-off period.
Since the high voltage external MOSFET is in series with the
internal MOSFET, higher break down voltage is achieved
but the current capability is not increased.
There is an alternative application circuit shown in Figure
35 which can output voltage up to 30 V. For this circuit, a
diode-capacitor charge-pump voltage doubler constructed
by D2, D3 and C1 is added. During the internal MOSFET
switch-on time, the LX pin is shorted to ground and D2 will
charge up C1 to the stepped up voltage at the cathode of D1.
During the MOSFET switch-off time, the voltage at VOUT
will be almost equal to the double of the voltage at the
cathode of D1. The VOUT is monitored by the FB pin via the
resistor divider and can be set by the resistor values. Since
the maximum voltage at the cathode of D1 is 15ĂV, the
maximum VOUT is 30 V. The value of C1 can be in the range
of 0.47 mF to 2.2 mF.
Negative Voltage Generation
The NCP1403 can be used to produce a negative voltage
output by adding a diode-capacitor charge-pump circuit
(D2, D3, and C1) to the LX pin as shown in Figure 32. The
feedback voltage resistor divider is still connected to the
positive output to monitor the positive output voltage and a
small value capacitor is used at C2. When the internal
MOSFET switches off, the voltage at the LX pin charges up
the capacitor through diode D2. When the MOSFET
switches on, the capacitor C1 is effectively connected like a
reversed battery and C1 discharges the stored charges
through the Rds(on) of the internal MOSFET and D3 to
charge up COUT and builds up a negative voltage at VOUT.
Since the negative voltage output is not directly monitored
by the NCP1403, the output load regulation of the negative
output is not as good as the standard positive output circuit.
The resistance values of the resistors of the voltage divider
can be one-tenth of those used in the positive output circuit
in order to improve the regulation at light load.
For the application circuit in Figure 36, it is actually the
combination of the application circuits in Figures 32 and 33.
Step-Down Converter
NCP1403 can be configured as a simple step-down
converter by using the open-drain LX pin to drive an
external P-Channel MOSFET as shown in Figure 34. The
resistor RGS is used to switch off the P-Channel MOSFET
during the switch-off period. Too small resistance value
should not be used for RGS, otherwise, the efficiency will be
reduced.
White LED Driver
The NCP1403 can be used as a constant current LED
driver which can drive up to 4 white LEDs in series as shown
in Figure 2. The LED current can be set by the resistance
value of RS. The desired LED current can be calculated by
the equation below:
ILED
+
0.8
RS
Moreover, the brightness of the LEDs can be adjusted by
a DC voltage or a PWM signal with an additional circuit
illustrated below:
To FB Pin
To LED
DC/PWM
Signal
R2
C1 D2
0.1 mF
R1
100 k
C2
RS
GND
820 pF
With this additional circuit, the maximum LED current is
set by the above equation. The value of R2 can be obtained
by the following equation:
ǒ ǓR2 + VMAX * VD * 0.8
(ILED(MAX)*ILED(MIN))ĂRS
R1
VMAX is the maximum voltage of the control signal, VD
is the diode forward voltage, ILED(MAX) is the maximum
LED current and ILED(MIN) is the minimum LED current. If
a PWM control signal is used, the signal frequency from 4
kHz to 40 kHz can be applied.
In case the LEDs fail, the feedback voltage will become
zero. The NCP1403 will then switch at maximum duty cycle
and result in a high output voltage which will cause the LX
pin voltage to exceed its maximum rating. A Zener diode can
be added across the output and FB pin to limit the voltage at
the LX pin. The Zener voltage should be higher than the total
forward voltage of the LED string.
PCB Layout Hints
The schematic, PCB trace layout, and component
placement of the step-up DC-DC converter demonstration
board are shown in Figure 28 to Figure 31 for PCB layout
design reference.
Grounding
One point grounding should be used for the output power
return ground, the input power return ground, and the device
switch ground to reduce noise. The input ground and output
ground traces must be thick and short enough for current to
flow through. A ground plane should be used to reduce
ground bounce.
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11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet NCP1403.PDF ] | |
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