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KA7543 の電気的特性と機能

KA7543のメーカーはFairchildです、この部品の機能は「Advanced Feedback Dimming Ballast Control IC」です。


製品の詳細 ( Datasheet PDF )

部品番号 KA7543
部品説明 Advanced Feedback Dimming Ballast Control IC
メーカ Fairchild
ロゴ Fairchild ロゴ 




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KA7543 Datasheet, KA7543 PDF,ピン配置, 機能
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

1 Page





KA7543 pdf, ピン配列
Pin Assignments
OUT2 NC GND Cdm Cs Vdm Vld
KA7543
OUT1 NC Vcc
Cc V5 Vfb
Vab
Pin Definitions
Pin Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Pin Name
OUT1
NC
Vcc
Cc
V5
Vfb
Vab
Vld
Vdm
Cs
Cdm
GND
NC
OUT2
Pin Function Description
Drive Output 1
No Connection
Supply Voltage Input
Compensation Input
5V Voltage Source
Negative Feedback Input
Abnormal Protection Input
Lamp Detection Input
Dimming Control Input
Soft Start Time Control Input
Soft Dimming Control Input
Ground
No Connection
Drive Output 2
KA7543
3


3Pages


KA7543 電子部品, 半導体
KA7543
Operating Description
lamp feedback
lamp change
soft moving on dimming
Vcs 2Lamp
2V
1V
0.5V
2V
1V
0
Vfb
Vdm
1Lamp
t[sec]
Figure 1. Operation Characteristics
The KA7543 is an advanced, lamp current feedback ballast dimming control IC which drives half bridge converter. This
control IC provides all the necessary features to implement wide range dimming control, soft-start and constant power
consumption for the intelligent electronic ballast system. The number of external components can be minimized by adopting
the KA7543. Protection circuitry, no lamp protection, abnormal protection, one lamp detection, UVLO and restart on lamp
adding have been included in the KA7543. Fig. 1 shows the operational characteristic of the KA7543 according to time and
lamp count variation. When the Vcc voltage reaches the start-up threshold voltage(9.5V), the soft start capacitor begins to be
charged. When the Cs pin voltage, Vcs is over 2V, the soft start operation ends. During the soft start operation, the reference
voltage which controls the lamp current is proportional to Vcs. 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.
UVLO(Under Voltage Lock Out)
Vcc
To output
Reset Cs
UVLO
9.5V
- 1.8V
3+
7V Vz
Supply
sw
2V Vref
(bandgap)
2V
Internal
bias
bias
7V
Figure 2. UVLO
Until the Vcc voltage reaches the start-up threshold voltage(9.5V), UVLO circuit lowers the IC operating current below
270µA. When the Vcc voltage reaches the start-up threshold voltage, it generates IC reference voltage(Vref) and supplies bias
current for the whole circuitry. The hysteresis of UVLO circuit is 1.8V.
6

6 Page



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