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KA7541D データシート(PDF) 5 Page - Fairchild Semiconductor

部品番号 KA7541D
部品情報  Simple Ballast Controller
Download  14 Pages
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メーカー  FAIRCHILD [Fairchild Semiconductor]
ホームページ  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

KA7541D データシート(HTML) 5 Page - Fairchild Semiconductor

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KA7541
5
Start-up Circuit
Start up current is supplied to the IC through the start up resistor (Rst). In order to reduce the power dissipation in Rst, the Rst
is connected to the full wave rectified output voltage.
The following equation can be used to calculate the size of Rst
The size of start up capacitor (Cst) is normally decided in terms of the start up time and operating current build up time with
auxiliary operating current source.
The turn off snubber capacitor (Cq2) and two diodes (D1, D2) constitute the auxiliary operating current source for the IC. The
charging current through the Cq2 flows into the IC and also charges the start-up capacitor. If the size of Cq2 is increased, the
VCC voltage of the Cst is also increased.
Figure 1. Start up circuit
Oscillator
The gate drive output frequency is as half as that of the triangular waveform in timing capacitor (Ct) at pin #2. In normal
operating mode, the timing capacitor charging current is 50
µA. The discharging current is seven times of the charging current
(7
× 50µA). The charging period of the timing capacitor is the on duty of the gate drive. The discharging period is the off duty
of the gate drive.
The rising slope and falling slope of the triangular waveform are as following.
Rising slope: dv / dt = i / C = 50
µA / Ct
Falling slope: dv / dt = i / C = 7
× 50µA / Ct
For example, when the timing capacitor is 180pF,
∆Tch = 6.69µ
∆Tdis = 0.956µ
Rst
Vin ac
()
2Vth st
() max
,
×
Ist max
,
---------------------------------------------------------------------------
<
85
2
10.5
×
0.25
10
3
×
--------------------------------------
440k
=
=
P
RSt
Vin ac_max
()
2Vcc
()
2
R
St
------------------------------------------------------------------------
0.5W
=
R
St
2
Vin ac_max
()
2Vcc
()
2
×
R
St
260K
260K
R
St
440K
≤≤
Q1
Q2
Cq2
D1
D2
Rectifier
Output
Rst
Cst
+
To VCC
(Pin 8)


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