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NCP5021
ESD Protection Circuit
Depending upon the function of the pin, different circuitry is applied. The basic structure are illustrated in Figure 2.
+Vcc
I/O Pin
D1
FET_P
DRIVER
FET_N
D1
Vz45V
Vsw pin
D2
GND
FET_N
Standard Low
Voltage Structure
High Voltage
Structure
GND
GND
Figure 2. Typical ESD Protection Structures
Although the structures are capable to handle the ESD
Vbat
?
stresses (as defined by the JEDEC specifications), no
current or voltage, either DC or AC, beyond the maximum
ratings specifications shall be applied to any pin.
DC/DC Operation
The boost converter is based on a PWM structure to
generate the output voltage necessary to drive the series
arranged LED. The system includes an open load detection
to avoid over voltage situation when the LED are
disconnected from the Vout pin. A built ? in circuit prevent
Vbat
Current Sense
H1
+
H
2
3
2
L1
4.7uH
1 DNSR0320MW2T1
M8
D5
470nF
C1
D6
D2
high inrush current when the system is powered.
The ILED is regulated by means of a built ? in current
mirror controlled by the digital content of the ILEDREG
1
D3
register. With a typical 1.3 Mhz operation frequency, the
converter can run at full power with a tiny 4.7 m H inductor.
However, cares must be observed, at ESR level, to optimize
the total DC/DC conversion efficiency. In particular, the
ferrite material shall have limited eddy current losses at
high frequency. Depending upon the type of material, the
eddy losses in the inductor can range from a low 40 mW to
a high 250 mW under the same bias and load conditions.
FEEDBACK
Vbat
I1
Iref
3
M9
1
2
2
3
1
M10
D4
Table 6. RECOMMENDED INDUCTOR
MANUFACTURERS
Figure 3. Basic Boost Structure
Manufacturers
TDK
COILCRAFT
Part Number
LPO3310 ? 472ML
MURATA
http://onsemi.com
6
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