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NCP5608 Datenblatt(PDF) 7 Page - ON Semiconductor

Teilenummer NCP5608
Bauteilbeschribung  Multiple LED Charge Pump Driver
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Hersteller  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

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NCP5608
http://onsemi.com
7
APPLICATIONS INFORMATION
DC−DC OPERATION
The converter is based on a charge pump technique to
generate a DC voltage capable to supply the white LED
load. The system regulates the current flowing into each
LED by means of internal current mirrors associated with
the white diodes. Consequently, the output voltage will be
equal to the Vf of the LED, plus the 300 mV (typical)
developed across the internal NMOS mirror. Typically,
assuming a standard white LED forward biased at 10 mA,
the output voltage will be 3.2 V.
The third external capacitor makes possible the 1.33X
extra mode of operation, with a significant efficiency
improvement of the converter over the normal battery
voltage span. The threshold levels have been defined to
optimize this range of operating voltages, assuming a high
efficiency is not relevant when the system is connected to
a battery charger (i.e. Vbat > 4.5 V).
The built−in OVP circuit continuously monitors each
output and stops the converter when the voltage is above
5.0 V. The converter resumes normal operation when the
voltage drops below 5.0 V (no latch−up mechanism).
Consequently, the chip can operate with no load during any
test procedures, but in the case of special applications, it is
recommended to connect the unused LED driver either to
the VOUT supply to avoid any uncontrolled operation.
The structure is built with power MOS devices to
accommodate the modes selected by the analog functions.
The current flowing into each LED is continuously
regulated
according
to
the
value
defined
by
the
programming message. The total current is limited
to
500 mA DC.
The system runs with two cycles:
− Cycle#1
Fly capacitors are charged from the battery.
− Cycle#2
Energy accumulated into the fly capacitors is
transferred to the load.
PIN 16
GND
VOUT
PWRGND
Q2
PIN 19
C1
C1N
C1P
PIN 17
Q8
C2
C2P
PIN 21
Q12
C3
C3P
PIN 22
Q1
Q6
Q10
Q11
Q3
Q7
Q4
Q5
Q9
PIN 23
PIN 20
CURRENT CONTROL
PIN 18
PIN 13
LEDx
GND
C2N
C3N
Li−Ion
2.90 V − 4.10 V
Figure 3. Basic DC−DC NCP5608 Converter Structure
GND


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