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ZXLD1322 Datasheet(PDF) 6 Page - Zetex Semiconductors

Part No. ZXLD1322
Description  Buck/boost mode DC-DC converter for LED driving with 700mA output and current control
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Maker  ZETEX [Zetex Semiconductors]
Homepage  http://www.diodes.com/
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ZXLD1322 Datasheet(HTML) 6 Page - Zetex Semiconductors

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ZXLD1322
Issue 1 - January 2008
6
www.zetex.com
© Zetex Semiconductors plc 2008
DC-DC convertertoutput parameters
Switching NPN transistor
NOTES:
(c) Measured under pulse conditions.
(d) This current is measured via the collectors and emitters of the switch with these connected to ground (0V)
(e) Measured under pulse conditions. Peak Current = Ic
Symbol
Parameter
Conditions
Min
Typ
Max
Units
Toff(100)
Discharge pulse width
100% output current
0.7
1.2
1.7
µs
Toff(10)
Discharge pulse width
10% output current
4
8
12
µs
fLXmax
Maximum operating
frequency
600
KHz
fSU
Switching frequency in start-
up mode
VIN=1.2V
50
KHz
Symbol
Parameter
Conditions
Min
Typ
Max
Units
ISW
Average continuous switch
current(c)
2A
IBON(max)
Maximum base current into
switch transistor from internal
drive circuit(d)
2V<VIN<18V
BIAS pin at 0V
30
50
70
mA
IBON
Base current into switch
transistor using external
resistor (RBASE) from BIAS pin
to ground
RBIAS = 1680Ω
10
mA
V(BR)CE
Collector-Emitter breakdown
voltage
IC=10µA
15
V
VCE(sat)
Collector-Emitter saturation
voltage
IC=0.1A, IB=10mA
IC=2A, IB=50mA(e)
50
120
mV
mV
hFE
Static forward current transfer
ratio
IC=200mA, VCE=2V
IC=2A, VCE=2V
209
116
COBO
Output capacitance
VCB=10V,f=1MHz
64
pF
t(on)
Turn-on time
Ic=0 to IC=2A
VIN=10V
30
ns
t(off)
Turn-off time
IC=2A to Ic<100µA
28
ns


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