ZXSC400E6TA Diodes Zetex, ZXSC400E6TA Datasheet - Page 7
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ZXSC400E6TA
Manufacturer Part Number
ZXSC400E6TA
Description
IC LED DRVR WHITE BCKLGT SOT23-6
Manufacturer
Diodes Zetex
Type
Backlight, White LEDr
Datasheet
1.ZXSC400E6TA.pdf
(16 pages)
Specifications of ZXSC400E6TA
Topology
PWM, Step-Up (Boost)
Number Of Outputs
1
Internal Driver
Yes
Type - Primary
Backlight, Flash/Torch
Type - Secondary
High Brightness LED (HBLED), White LED
Frequency
200kHz
Voltage - Supply
1.8 V ~ 8 V
Mounting Type
Surface Mount
Package / Case
SOT-23-6
Operating Temperature
-40°C ~ 85°C
Current - Output / Channel
50mA
Internal Switch(s)
Yes
Efficiency
80%
Operating Supply Voltage (typ)
2.5/3.3/5V
Operating Temperature (min)
-40C
Operating Temperature (max)
85C
Operating Temperature Classification
Industrial
Package Type
SOT-23
Pin Count
6
Mounting
Surface Mount
Power Dissipation
450mW
Operating Supply Voltage (min)
1.8V
Operating Supply Voltage (max)
8V
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Voltage - Output
-
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Compliant
Other names
ZXSC400E6TATR
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ZXSC400E6TA
Manufacturer:
DIODES
Quantity:
42 000
Part Number:
ZXSC400E6TA
Manufacturer:
DIODES/美台
Quantity:
20 000
Open-circuit protection
For applications where the LED chain might go
open-circuit a Zener diode can be connected across the
LED chain preventing over-voltage and possible
damage to the main switching transistor. The Zener
diodes should be selected by ensuring its voltage
rating is higher than the combined forward voltage of
the LED chain. Under open circuit conditions the curren
in the Zener diode defines the output current as:
The circuit example below give an open circuit output
current of 300 A.
Dimming Control
There are four types of dimming control that can be
implemented for the ZXSC400.
ISSUE 1 - JANUARY 2003
I
Z
=
V
R
FB
Z
7
Dimming Control using the shutdown pin
The first method uses the shutdown pin. By injecting a
PWM waveform on this pin and varying the duty cycle,
LED current and hence LED brightness can be adjusted.
To implement this method of brightness control on the
ZXSC400, apply PWM signal with amplitude of
between 0.7V and Vcc at a frequency of 120Hz or above
(to eliminate LED flicker). The LED current and hence
LED brightness is linearly proportional to the duty cycle
ratio, so for brightness control adjust duty cycle ratio as
necessary. For example, a 10% duty cycle equates to
10% of full LED brightness.
ZXSC400