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PDF ZD832 Data sheet ( Hoja de datos )
| Número de pieza | ZD832 | |
| Descripción | Universal Transformerless AC-DC Constant Current LED Driver | |
| Fabricantes | Zywyn | |
| Logotipo |  |
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ZD832 Transformerless LED Driver
Zywyn
Advance Product Informationwww.DataSheet4U.com
ZD832
Universal Transformerless AC-DC Constant Current LED Driver
Features
• AC to DC Constant Current Driver
• No Transformer, No External Bridge Rectifier
• 85VAC to 240VAC Input Voltage Range
• Programmable up to 30mA Constant Output Current
• PWM or Analog Dimming Control
• Over-Temperature Protection
• Over-Voltage Limiting on Internal Power Transistor
• High Voltage Static Circuit Design With No EMI
• Thermally Enhanced 20-Lead Exposed TSSOP Green
Package
Applications
• Offline LED Lamps and Fixtures
• LCD Panel Display Backlighting
• Avionics Displays
• Decorative Lighting
• Industrial Lighting
Pin Configuration
VAC- 1
VAC- 2
NC 3
NC 4
NC 5
PWM 6
VCAP 7
ISET 8
NC 9
SGND 10
ZD832
20 VAC+
19 VAC+
18 NC
17 NC
16 HVCC
15 NC
14 VOUT
13 VOUT
12 PGND
11 PGND
General Description
The ZD832 is a high voltage, transformerlessAC-DC constant
current driver for driving a string of white or RGB LEDs in
series. It operates from an universal input voltage of 85VAC
to 240VAC and generates a programmable constant output
current. The high operating voltage of ZD832, along with its
linear control architecture eliminates the need for an external
inductor, transformer and rectifying diode bridge. The output
current level is set by a single resistor and can be set as high
as 30mA. Dimming control can be accomplished by using
pulse-width modulation signal with varying duty cycle on the
PWM pin or by applying an analog DC voltage on the ISET
pin. Thermal and over-voltage circuitry protects the internal
power transistors from excessive power dissipation.
The ZD832 is available in a thermally enhanced 20-pin ex-
posed TSSOP green package.
Ordering Information
Part Number
ZD832LEY
ZD832EVB
Temperature Range
–40°C to +85°C
n/a
Package Type
20-EP TSSOP
Evaluation Board
Please contact the factory for pricing and availability on Tape-on-Reel
option.
Typical Application
18050~240VAC
CVCAP
1μF
+
-
VCAP
ZD832
COUT
10μF
ILEVD
20-Pin Exposed TSSOP
WARNING! This is a high voltage application circuit
where Galvanic Isolation is not provided. Dangerous
voltages are present when connected to the AC line. It
is the responsibility of the engineer employing the ZD832
to ensure adequate safeguards are put in place to protect
the end user from electrical hazardous shock.
VOUT
REXT
[ILED]=[2500/(RSET)]
Figure 1. ZD832 driving a string of LEDs in series at a pre-
setted constant current
Zywyn Specifications subject to change without notice
Zywyn Corporation • Tel (408) 733-3225 • Fax (408) 733-32061 • Email [email protected] • www.zywyn.com January 2007
rev. 1.0
1 page  
Zywyn Corporation
Circuit Description
The Limiting Resistor REXT
To protect excessive power dissipation on the internal
power transistor, an external resistor REXT may be re-
quired to maintain the VOUT within the range of 3V and
30V. The formula for the limiting resistor REXT should be
used to calculate the resistor value in series with the LEDs
as follows,
REXT = (HVCC - n · VFORWARD-LED - VOUT)/ILED
where,
HVCC = High Voltage Rectified DC, typically
n = Number of LEDs connected in series.
2 ⋅VAC
VFORWARD-LED = Forward bias voltage of a single LED.
VOUT = Voltage at VOUT pin, typically 5V
ILED = Regulated LED current, ranges from 3mA to 30mA.
Use the following formula to make sure REXT has ad-
equate power rating tolerance:
PREXT = (ILED)2 · REXT
where
PREXT = Power dissipated by REXT
ILED = Regulated LED current, ranges from 3mA to 30mA.
The maximum number of driven LEDs per string is
shown in table below for reference, assuming the for-
ward bias voltage of LED is 3.2V, VOUT = 5V,
COUT = 10μF, and ILED = 30mA:
VAC Input
Voltage
85 VAC
100 VAC
120 VAC
200VAC
220VAC
240VAC
Max.
Number of
LEDs
35
41
50
85
92
100
REXT
(Ω)
66.7
126
100
100
286
366
Power
Rating
(W)
0.25
0.25
0.25
0.25
0.25
0.25
ZD832
www.DataSheet4U.com
Selecting External Component RSET to Set ILED
Current
The ZD832 uses an external resistor, RSET, to set the
constant LED current, ILED. ILED is determined by the
formula:
[ILED]=[2500/(RSET)]
with a minimum value of RSET ≥ 83KΩ, which sets the
ILED to 30mA, and a maximum value of RSET ≤ 833KΩ,
which sets the minimum ILED to 3mA (Refer to Figure 3).
The maximum allowable capacitance at the ISET pin is
50pF.
ILED VS RSET
30
25
20
15
10
5
0
0 100 200 300 400 500 600 700 800 900
RSET(KΩ )
Figure 3. ILED vs RSET
Specifications subject to change without notice
5 January 2007
rev. 1.0
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet ZD832.PDF ] | |
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