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AMG-LI080

Timer/Dimmer with Gate Driver, Zero Detection & Protection

厂商名称:Alpha-Micro Electronics

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AMG-LI080
Timer/Dimmer with Gate Driver, Zero Detection & Protection
1. Functional Description
The AMG-LI080 is a timer IC with a gate driver output for MOSFETs. The timer is set by a
zero crossing detector and reset by external RC. This IC features protection against over-
current, over-voltage and over-temperature. This IC is well suited for several kinds of dimmer
and timer applications.
2. Features
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Supply voltage: 10VDC...12VDC
Power-on start schematic
Load power between 20W...1000W (depends on external MOSFETs)
Flexible soft start function
Zero-crossing detection
Inputs for protection functions (over-current, over-voltage and over-temperature)
Low bias current
Protective shut down function
LED status indication for output status at all times
Ambient temperature range: 0°
C...85°C
Package: SOP14 – Body size: 8.65mm x 3.90mm x 1.45mm
RoHS compliant
3. Application
The AMG-LI080 is suitable for timing, PWM and dimmer applications. It is most suitable for
incandescent and halogen lamp dimmers.
AMG-LI080
Revision: B
8. Nov. 2012
© All rights reserved
Page 1 of 24
AMG-LI080
Timer/Dimmer with Gate Driver, Zero Detection & Protection
3.1. Application Circuit Example
VDD
Protect
Latch
OS
Softstart
Power on
IOUT
CS
CS
OC1
D4
~
OC2
D3
OV
NTC
OT
LI080
OUT
IR
TRES
Time
Reset
Zero
Detect
Mono
FF
R
FF
Q
INZ
S
QB
GND
CM1
CM2
Figure 1: Example application circuit
AMG-LI080
Revision: B
8. Nov. 2012
© All rights reserved
Page 2 of 24
AMG-LI080
Timer/Dimmer with Gate Driver, Zero Detection & Protection
Table of Contents
1.Functional Description...........................................................................................................1
2.Features.................................................................................................................................1
3.Application.............................................................................................................................1
3.1.Application Circuit Example......................................................................................................2
4.Block Diagram.......................................................................................................................4
5.Block Descriptions.................................................................................................................5
5.1.Zero Crossing ..........................................................................................................................5
5.2.Time Reset...............................................................................................................................5
5.3.Gate Driver + Output Latch......................................................................................................5
5.4.Protection Logic........................................................................................................................5
5.5.Soft Start...................................................................................................................................5
6.Pinning...................................................................................................................................6
7.Pin description.......................................................................................................................7
8.Function Table........................................................................................................................8
9.Absolute Maximum Ratings...................................................................................................8
10.Electrical Characteristics......................................................................................................9
10.1.Operational Range.................................................................................................................9
10.2.DC Characteristics.................................................................................................................9
10.3.AC Characteristics................................................................................................................10
11.Diagrams............................................................................................................................11
11.1.Electrical Diagrams...............................................................................................................11
11.2.Pulse Diagrams....................................................................................................................18
11.3.Start Up Diagrams................................................................................................................19
11.4.Soft Start Diagrams..............................................................................................................20
11.5.Error Function Diagrams......................................................................................................21
12.IC-Package........................................................................................................................22
13.IC-Marking.........................................................................................................................22
14.Ordering Information..........................................................................................................22
15.Notes and Cautions...........................................................................................................23
15.1.ESD Protection.....................................................................................................................23
15.2.Storage conditions................................................................................................................23
16.Disclaimer..........................................................................................................................23
17.Contact Information............................................................................................................24
AMG-LI080
Revision: B
8. Nov. 2012
© All rights reserved
Page 3 of 24
AMG-LI080
Timer/Dimmer with Gate Driver, Zero Detection & Protection
4. Block Diagram
VDD
Protect
Latch
OS
Softstart
Power on
IOUT
CS
OC1
OC2
OV
OT
LI080
OUT
IR
TRES
Time
Reset
Zero
Detect
Mono
FF
R
FF
Q
INZ
S
QB
GND
CM1
CM2
Figure 2: LI080 Block Diagram
AMG-LI080
Revision: B
8. Nov. 2012
© All rights reserved
Page 4 of 24
AMG-LI080
Timer/Dimmer with Gate Driver, Zero Detection & Protection
5. Block Descriptions
5.1. Zero Crossing
Detects the Zero Crossing of the AC sine wave. The INZ input is connected to the rectified
mains with a resistor divider. For noise suppression, the INZ input should also be connected to
GND with a capacitor. This capacitor will cause a time delay between the actual zero crossing
and the detection. Bigger capacitors will cause a longer time delay than smaller ones. This
time delay may or may not affect the function.
5.2. Time Reset
Determines the on time of the output, thus the duty cycle, or the time of the reverse phase cut.
The Time Reset is triggered by the zero crossing. The Time Reset is reset by an external R
and C, which determines the time to reset.
5.3. Gate Driver + Output Latch
Supplies the gate charge for the external MOSFETs. Continuous current capability is around
10mA. The output latch is set by the Zero Crossing and reset by the Time Reset.
5.4. Protection Logic
The IC has 3 sense inputs for over voltage, over current and over temperature protection.
OVP: Over Voltage Protection
OTP: Over Temperature Protection
OCP: Over Current Protection
These sense inputs have an internal pull up and are connected to a comparator. The
comparator thresholds are set according to their dedicated protection function, but
nevertheless, they can be used for something else. The sense inputs all need some additional
external circuitry to enable the protection. Please refer to the example application diagram or
the application note. If a specific protection function is not needed, the corresponding sense
input should be connected to GND. All 3 protection comparators individually set a latch when
the threshold is reached. When set, the latch will inhibit the Zero Crossing and thus the output
of the device and activate the LED driver. The protective latch is reset at power up. As such
the protection functions work like a recoverable fuse.
5.5. Soft Start
Soft Start is in essence adjustable current source. With an external C, the time to reach max.
current can be adjusted. In that way, a soft start function can be built. Please refer to the
example application diagram or the application note. In case, a 1-10V analog signal shall
control the dimmer, it can be connected to the CS pin.
AMG-LI080
Revision: B
8. Nov. 2012
© All rights reserved
Page 5 of 24
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