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PDF ZXSC410 Data sheet ( Hoja de datos )

Número de pieza ZXSC410
Descripción DC-DC BOOST SWITCHING CONTROLLERS
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ZXSC410/ZXSC420/ZXSC440
DC-DC BOOST SWITCHING CONTROLLERS
Description
The ZXSC410/420/440 are DC-DC boost controllers. Their wide input
voltage range makes them suitable for operation for a number of
battery configurations including single Li-Ion cell and 2~3
alkaline/NiCd/NiMH cells. Using high gain Diodes Zetex-brand
switching npn-transistors allows high-voltage boost ratios and/or high
output current depending on the transistor. The ZXSC410/440 has a
shutdown feature that can also be used for some dimming
functionality. ZXSC420/440 includes an End of Regulation flag that
can be used to indicate when the regulator is no longer able to
maintain the regulated output voltage/current or has reached the
required current/voltage. The ZXSC440 combines the features of the
ZXSC410 and ZXSC420 into one device.
Pin Assignments
ZXSC410 (SOT26)
VCC 1
GND 2
STDN 3
8 DRIVE
7 VFB
6 SENSE
ZXSC420 (SOT26)
VCC 1
GND 2
EOR 3
8 DRIVE
7 VFB
6 SENSE
Features
1.65V to 8V Supply Range
Typical Output Regulation of ±1%
Over 85% Typical Efficiency
Output Currents Up to 300mA
4.5µA Typical Shutdown Current ZXSC410/440
End of Regulation Output ZXSC420/440
Available in SOT26 and MSOP-8
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
ZXSC440 (MSOP-8)
DRIVE 1
VFB 2
SENSE 3
N/C 4
8 VCC
7 GND
6 EOR
5 STDN
Applications
System Power for Battery Portable Products
LCD Bias
Local Voltage Conversion
High-Brightness LED Driving
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
Typical Applications Circuit
22µH
ZHCS2000
ZXTN25012EFH
100µF
22µF ZXSC410
18m
820m
ZXSC410/ZXSC420/ZXSC440
Document number: DS33618 Rev. 6 - 2
1 of 17
www.diodes.com
August 2015
© Diodes Incorporated

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ZXSC410 pdf
ZXSC410/ZXSC420/ZXSC440
Application Information
Functional Blocks
Bandgap Reference
All threshold voltages and internal currents are derived from a temperature compensated bandgap reference circuit with a reference voltage of
1.22V nominal.
Dynamic Drive Output
Depending on the input signal, the output is either “LOW” or “HIGH”. In the high state a 2.5mA current source, (max drive voltage = VCC -0.4V)
drives the base or gate of the external transistor. In order to operate the external switching transistor at optimum efficiency, both output states
are initiated with a short transient current in order to quickly discharge the base or the gate of the switching transistor.
Switching Circuit
The switching circuit consists of two comparators, Comp1 and Comp2, a gate U1, a monostable and the drive output. Normally the DRIVE output
is “HIGH”; the external switching transistor is turned on. Current ramps up in the inductor, the switching transistor and external current sensing
resistor. This voltage is sensed by comparator, Comp2, at input ISENSE. Once the current sense voltage across the sensing resistor exceeds
20mV, comparator Comp2 through gate U1 triggers a re-triggerable monostable and turns off the output drive stage for 2μs. The inductor
discharges to the load of the application. After 2μs a new charge cycle begins, thus ramping the output voltage. When the output voltage reaches
the nominal value and VFB gets an input voltage of more than 300mV, the monostable is forced “on” from Comp1 through gate U1, until the
feedback voltage falls below 300mV. The above action continues to maintain regulation.
EOR, End of Regulation Detector (ZXSC420/440)
The EOR circuit is a retriggerable 120μs monostable, which is re-triggered by every down regulating action of comparator Comp1. As long as
regulation takes place, output EOR is “HIGH” (high impedance, 100K to VCC). Short dips of the output voltage of less than 120μs are ignored. If
the output voltage falls below the nominal value for more than 120μs, output EOR goes ”LOW”. The reason for this to happen is usually a slowly
progressing drop of input voltage from the discharging battery. Therefore, the output voltage will also start to drop slowly. With the EOR detector,
batteries can be used to the ultimate end of discharge, with enough time left for a safe shutdown. It can also be used in high-voltage photoflash
with the ZXSC440 to show when the capacitor is fully charged.
Shutdown Control
The ZXSC410/440 offers a shutdown mode that consumes a standby current of less than 5µA. The ZXSC410/440 is enabled, and is in normal
operation, when the voltage at the STDN pin is between 1V and 8V (and also open circuit). The ZXSC410/440 is shutdown with the driver
disabled when the voltage at the STDN pin is 0.7V or lower. The STDN input is a high impedance current source of 1µA typ. The driving device
can be an open-collector or -drain or a logic output with a “High” voltage of 5V max. The device shutdown current depends on the supply voltage,
(see typical characteristics graph).The ZXSC440 with its STDN pin and EOR pins can be used as a camera flash driver.
The STDN pin is used to initiate the high-voltage capacitor charge cycle. The EOR pin is used as flag to show when the capacitor has been
charged to the appropriate level.
A transformer is used to boost the voltage. If designing a transformer, bear in mind that the primary current may be over an amp and, if this flows
through 10 turns, the primary flux will be 10 Amp. Small number of turns and small cores will need an air gap to cope with this value without
saturation. Secondary winding capacitance should not be too high as this is working at 300V and could soon cause excessive losses.
ZXSC410/ZXSC420/ZXSC440
Document number: DS33618 Rev. 6 - 2
5 of 17
www.diodes.com
August 2015
© Diodes Incorporated

5 Page





ZXSC410 arduino
Application Examples
ZXSC410 DC-DC Boost Voltage Regulators
VIN = 2.5V to 4.2V, VOUT = 5V; ILOAD = 100mA
VIN = 2.5V to 4.2V
ZXSC410/ZXSC420/ZXSC440
22µH
ZHCS2000
ZXTN25012EFH
22µF
R3
16kΩ
C3
100nF
22µF
ZXSC410
100mΩ
1kΩ
100 100
90
VIN = 3.6V
VIN = 4.2V
80
VIN = 3V
70
0 20 40 60 80 100
LOAD CURRENT (mA)
Load Current vs. Efficiency
90 ILOAD = 10mA
ILOAD = 100mA
80
ILOAD = 60mA
70
2.5
3.0 3.5 4.0
INPUT VOLTAGE (V)
Input Voltage vs. Efficiency
Switching Waveform
ZXSC410/ZXSC420/ZXSC440
Document number: DS33618 Rev. 6 - 2
11 of 17
www.diodes.com
Output Ripple
August 2015
© Diodes Incorporated

11 Page







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