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ZD1680ALEY/TR

Description
Interface Circuit,
CategoryAnalog mixed-signal IC    Drivers and interfaces   
File Size999KB,12 Pages
ManufacturerASIX
Websitehttp://www.asix.com.tw
Download Datasheet Parametric Compare View All

ZD1680ALEY/TR Overview

Interface Circuit,

ZD1680ALEY/TR Parametric

Parameter NameAttribute value
MakerASIX
package instruction,
Reach Compliance Codecompliant
Base Number Matches1
ZD1680/ZD1680A High Efficiency Step-Up Controller for LEDs with 6 Channel Constant Current Driver.
Zywyn
Features
Drives 6 Strings of Up to 16, Serially Connected LEDs
6 Channels of Current Sink at
50mA
Each Channel
Supports up to 15W with an External RSENSE Resistor
Greater Than 90% Efficiency
Adjustable LED Brightness with PWM or DC Voltage
through the ISET Pin
LED Currents Set By One External RSET Resistor
CHIP ENABLE (CE) Pin for Enable or Shutdown
VBST Pin to set a Higher Gate Drive Voltage (>VDD) for
More Efficient and Versatile N-Channel Power FETs can
be used
ALERT Output Signal for a Open/Short LED Indication
(ZD1680A only)
Output Over-Voltage Protection (OVP) Limiting, Exter-
nally Adjustable
Under Voltage Lockout, UVLO
Internal Soft Start Inrush Current Limiting
Internal Thermal Protection
Simpler, Low Cost, More Reliable Compared to CCFL
or EL Backlighting
Available in a 5x5mm 32-pin VQFN or a 28-pin Ex-
posed-TSSOP Green Package
Preliminary Information
ZD1680/ZD1680A
High Efficiency Step-Up Controller for LEDs with 6 Channel
Current Sink, Auxiliary Gate Drive and LED Open-Short Detection
General Description
The ZD1680/ZD1680A is a high efficiency step-up controller especially
designed for driving multiple strings of serially connected LEDs. 6 channels
of low dropout current sinks are included to provide excellent matching of
currents for each LED string. The boost converter control loop regulates
the current source outputs to 0.3V for maximum efficiency. All 6 channel
LED current outputs are set by a resistor RSET to ground at the ISET
pin. A CHIP ENABLE (CE) input provides an enable or shutdown function
to the IC and the ISET pin can be used to adjust the LED string current
with a PWM signal or a DC voltage. Each LED channel can be individu-
ally enabled for maximum flexibility. Unused channels must be disabled
for proper circuit operation. Also included is an Under Voltage Lockout
(UVLO) circuit to discontinue operation when input VDD falls below 2.7V
and automatic soft start to limit inrush currents during power start-up or
following a re-CHIP ENABLE function. An ALERT function (available for
ZD1680A only) at the SEL pin whenever two LEDs are either in a shorted
or open condition due to LED at fault or malfunction. Output Over-Voltage
Protection (OVP) is available by user-defined resistor network setting to
protect the LEDs and the IC.
The ZD1680/ZD1680A is available in a 5x5mm 32-pin VQFN or 28-pin
Exposed- TSSOP Green Package.
Ordering Information
Part Number
ZD1680LEQ/
ZD1680ALEQ
ZD1680LEY/
ZD1680ALEY
ZD1680YEVB
Temperature Range
–40°C to +85°C
–40°C to +85°C
n/a
Package Type
32-Pin 5x5 VQFN
28-EP-TSSOP
Evaluation Board
for ZD1680LEY/
ZD1680ALEY
Evaluation Board
for ZD1680LEQ/
ZD1680ALEQ
Applications
• Battery-Powered Backlighting Applications
• LCD Panel And Monitor Display Backlighting And Plane-
lighting
• Navigation Panel Display Backlighting
• PMPs And Portable Handy Terminals
• Portable LED Projectors
• Street Lamps; Industrial Lighting
ZD1680QEVB
n/a
Please contact the factory for pricing and availability on T&R option.
Pin Configuration
GND
D2
GND
D5
D1
D3
D4
D6
32
SEL
ISET
EN1
EN2
EN3
EN4
EN5
EN6
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
31
30
29
28
27
26
25
24
23
GND
CB
Typical Application
EN3 1
EN4 2
EN5 3
EN6 4
CE 5
VDD 6
OVP 7
NC 8
NC 9
NC 10
NC 11
CSS 12
CS 13
PGND 14
ZD1680/
ZD1680A
22 VBST
21
20
19
18
17
NDRV
PGND
CS
CSS
NC
ZD1680/
ZD1680A
28 EN2
27 EN1
26 ISET
25 SEL
24 D1
23 D2
22 D3
21 D4
20 D5
19 D6
18 GND
17 CB
16 VBST
15 NDRV
+5V to +26.5V
VBAT T
C8
4.7μF
R5
330KΩ
L1
10μH
C4
1μF
VBST
C2
1μF
CB
VBST NDRV
CS
R2
100Ω
D1
VOUT
R4
10Ω
M1
W
L
C1
10μF
R6
4.7KΩ
OVP
PGND
+3V to +5.5V
C3
1nF
VDD
D1
RSENSE*
0.12Ω
10 ~ 16 LED's and
50mA max
per string
VDD
C6
1μF
EN1
EN1
EN2
EN2
ZD1680/
ZD1680A
D2
D3
EN3
EN3
D4
EN4
EN4
D5
EN5
EN5
EN6
CE
SEL
ISET
GND
OVP
VDD
NC
CE
NC
NC
NC
NC
D6
CSS
C10
100pF
(Optional)
EN6
CE
SEL
RSET
5KΩ
SEL = TEST Pin (ZD1680)
= ALERT Pin (ZD1680A)
5x5 32-VQFN
SEL = TEST Pin (ZD1680)
= ALERT Pin (ZD1680A)
28-Exposed-TSSOP
NOT E: ILED=250/RSET
*NOTE 1. External RSENSE to be used to increase inductor current for 11W output power.
Figure 1. ZD1680/ZD1680A high efficiency step-up control-
ler for LEDs with 6 channels of constant current sink and
Specifications subject to change without notice
enables
Zywyn
1
May 2008
Zywyn Corporation • Tel (408) 733-3225 • Fax (408) 733-3206 • Email sales@zywyn.com • www.zywyn.com
rev. 1.6

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