Zxld1321 – Diodes ZXLD1321 User Manual
Page 6
ZXLD1321
Issue 1 - January 2008
6
www.zetex.com
© Zetex Semiconductors plc 2008
DC-DC converter output 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
f
LXmax
Maximum operating
frequency
600
KHz
f
SU
Switching frequency in start-
up mode
VIN=1.2V
50
KHz
Symbol
Parameter
Conditions
Min
Typ
Max
Units
I
SW
Average continuous switch
current
(c)
2
A
I
BON(max)
Maximum base current into
switch transistor from internal
drive circuit
(d)
2V
30
50
70
mA
I
BON
Base current into switch
transistor using external
resistor (R
BASE
) from BIAS pin
to ground
R
BIAS
= 1680
Ω
10
mA
V
(BR)CEO
Collector-Emitter breakdown
voltage
I
C
=10µA
20
V
V
CE(sat)
Collector-Emitter saturation
voltage
I
C
=0.1A, I
B
=10mA
I
C
=2A, I
B
=50mA
(e)
50
120
mV
mV
h
FE
Static forward current transfer
ratio
I
C
=200mA, V
CE
=2V
I
C
=2A, V
CE
=2V
209
116
C
OBO
Output capacitance
V
CB
=10V,f=1MHz
64
pF
t(on)
Turn-on time
Ic=0 to I
C
=2A
V
IN
=10V
30
ns
t(off)
Turn-off time
I
C
=2A to Ic<100µA
28
ns