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PDF ( 数据手册 , 数据表 ) KA7543

零件编号 KA7543
描述 Advanced Feedback Dimming Ballast Control IC
制造商 Fairchild
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KA7543 数据手册, 描述, 功能
www.fairchildsemi.com
KA7543
Advanced Feedback Dimming Ballast Control IC
Features
• Lamp Current Feedback
• Soft Start on Feedback
• Voltage Dimming (0V~2V) on Feedback
• Switch off Control (Vdm=5V)
• Soft Dimming Control
• No Lamp Protection
• One Lamp Detection for Feedback
• Abnormal Protection
• Low Start-up and Operating Supply Current
• UVLO with 1.8V Hysteresis
• Totem Pole Output
• Trimmed 1.5% Internal Bandgap Reference
• 14-DIP & 14-SOP
Applications
• Electronic Ballast
• Lighting Control System
• Half Bridge Drive Control System
Descriptions
The KA7543 is an advanced lamp current feedback dimming
control IC. This ballast control IC provides all of the
necessary features to implement wide range dimming
control, soft start and constant power consumption for
intelligent electronic ballast systems. The KA7543 is
optimized for advanced electronic ballast systems requiring
minimum board area. External component counts can be
reduced by adopting the KA7543. Current feedback control
method of the inverter status is one of the most attractive
merits in KA7543. Internal soft start circuitry eliminates the
need for external soft start discrete components. Voltage
controlled soft dimming circuit is built into the IC to control
the lighting output in a wide range. Protection circuitry, no
lamp protection, abnormal protection, one lamp detection,
UVLO, restart on lamp adding , have been added.
14-DIP
1
14-SOP
1
©2002 Fairchild Semiconductor Corporation
Rev. 1.0.3







KA7543 pdf, 数据表
KA7543
Dimming Control Stage
is
+
-
id
To error amp (+)
is-id
To output
Switch
-
5V
+
Mirror
idr
+
+
-
20kDimmer
11
9
2V
Cdm
Vdm
CURRENT
AMPLIFIER
DIMMING
CONTROL
Figure 5. Dimming Control Stage
The condition for full dimming is when the Vdm voltage is 2V and the condition for full lighting is when the Vdm voltage is
0V. Dimming operation starts when Vcs becomes 4V and the change rate of dimming is determined by the capacitor
connected to the Cdm pin. The more smooth dimming can be accomplished by the larger capacitor connected to the Cdm pin.
If the Vdm pin voltage is higher than 5V, then the output drive stage remains in off state. Dimming control and output drive on/
off control can be achieved with only one pin.
Output Drive Stage
From protection output from uvlo
From oscillator
Q
Frequency
divider
Output
stage
1 OUT1
14 OUT2
Figure 6. Output Drive Stage
OUT1 and OUT2 are complementary and there is 1.4us dead time for the ZVS operation. The structure of output stage is the
totem-pole output stage. For the high side MOSFET drive, a pulse transformer is necessary.
No Lamp Protection
If the Vld pin voltage is lower than 1V, it means that there is no lamp connected. On no lamp condition, the output drive stage
is in off state.
8







KA7543 equivalent, schematic
KA7543
DISCLAIMER
FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY
PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY
LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER
DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES
OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR
CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body,
or (b) support or sustain life, and (c) whose failure to
perform when properly used in accordance with
instructions for use provided in the labeling, can be
reasonably expected to result in a significant injury of the
user.
2. A critical component in any component of a life support
device or system whose failure to perform can be
reasonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
www.fairchildsemi.com
8/2/02 0.0m 001
Stock#DSxxxxxxxx
2002 Fairchild Semiconductor Corporation










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