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ZXLD1100 Datasheet(PDF) 3 Page - Zetex Semiconductors

Part No. ZXLD1100
Description  ADJUSTABLE LED DRIVER WITH INTERNAL SWITCH AND OPEN CIRCUIT PROTECTION IN SC70-6
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Maker  ZETEX [Zetex Semiconductors]
Homepage  http://www.diodes.com/
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ZXLD1100 Datasheet(HTML) 3 Page - Zetex Semiconductors

 
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ZXLD1100
SEMICO NDUC TORS
ISSUE 4 - JULY 2004
3
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
VIN
Input voltage
2.5
5.5
V
IIN
Supply current
Quiescent
Shutdown
VEN =VIN,ILX =0,
Output not switching
VEN =0V
60
100
500
A
nA
VFB
FB pin control voltage
90.5
109.5
mV
IFB
FB pin input current
100
nA
fLX
Operating frequency
L=10 H, VOUT =10V,
IOUT=20mA
0.35
1
MHz
TOFF
LX output 'OFF' time
350
500
ns
TON
LX output 'ON' time
(2)
5µs
ILXpk
Switch peak current limit
L=10 H, VOUT =10V,
IOUT=20mA
320
mA
RLX
Switch 'On' resistance
1.5
ILX(leak)
Switch leakage current
VLX =20V
1
µA
VOUT
Controller output voltage
Normal operation
VSENSE pin
open-circuit or
grounded
28
V
VOUT(MAX) Controller output voltage with output
open circuit
(3)
VSENSE connected to
Vout
25
30
V
VENH
EN pin High level Input voltage
Device active
1.5
V
IN
V
VENL
EN pin Low level Input voltage
Device in shutdown
0.4
V
IENL
EN pin Low level input current
VEN =0V
-100
nA
IENH
EN pin High level input current
VEN =VIN
1
A
TEN(hold)
EN pin turn off delay
(4)
VEN switched from
high to low
120
µs
∆T/T
PWM duty cycle range at ‘EN’ input for
filtered PWM control
(5)
10kHz < f < 100kHz,
VENH =VIN
20
100
%
fLPF
Internal PWM low pass filter cut-off
frequency
4
kHz
ALPF
Filter attenuation
f=30kHz
52.5
dB
ELECTRICAL CHARACTERISTICS (at VIN = 3V, Tamb = 25°C unless otherwise stated
(1))
NOTES:
(1) Production testing of the device is performed at 25°C. Functional operation of the device over a -40°C to +85°C temperature range is
guaranteed by design, characterization and process control.
(2) Nominal 'on' time (TONnom) is defined by the input voltage (VIN), coil inductance (L) and peak current (ILXpkdc) according to the expression:
TONnom = {ILX(pkdc) x L/VIN} +200ns.
(3) When using the open circuit protection feature, the maximum output voltage under normal operation should be maintained below the
minimum value specified, in order to prevent possible disturbance of the current control loop.
(4) This is the time for which the device remains active after the EN pin has been asserted low. This delay is necessary to allow the output to be
maintained during dc PWM mode operation.
(5) The minimum PWM signal frequency during this mode of operation is to ensure that the device remains active during PWM control. This
provides a continuous dc output current. For lower frequencies, the device will be gated 'on' and 'off' during PWM control.
(6) The maximum PWM signal frequency during this mode of operation should be kept as low as possible to minimize errors due to the turn-off
delay of the device (see Enable pin turn-off delay).


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