参数资料
型号: IRPLCFL1
文件页数: 3/8页
文件大小: 109K
代理商: IRPLCFL1
Reference Design Data Sheet intended for design information only.
Subjected to changes without prior notice.
3
IRPLCFL1
Functional Description (continued)
The frequency shifting is accomplished by switching out different capacitors used to
program the oscillator frequency. The capacitors are switched out by shorting them with
MOSFET’s which are timed to turn on at different times. The pre-heat frequency is determined
by the following formula:
f
C
R
C
5
C
C
ph
=
+
5
)(
6
)(
. (
6
6
)
The pre-heat time is determined by an RC combination formed by R3 and C3 and the
voltage of zener diode D1. When the voltage across C3 reaches the magnitude of the zener
diode D1 + the turn-on threshold of Q1, capacitor C6 is shorted out and the frequency shifts to
the final running frequency. The final running frequency is given by the formula:
f
R
C
run
=
1
6
. (
5
)(
)
The final component values, shown in Bill of Materials, were chosen to operate a 13 watt
compact fluorescent lamp with a cathode resistance at cold of 4 ohms. If a lamp is used which
has a different cathode resistance the component values for the pre-heat frequency selection
will need to be changed. The ballast circuit was operated at various temperatures from 25
degrees C to 105 degrees C with little or no change in the operating characteristics.
The IR Family of Integrated Half-Bridge Products (9-pin SIP Package)
Part Number
Maximum
Voltage
250V
250V
300V
400V
400V
500V
Rds(on)
at 25C
2.0
1.1
0.75
3.6
1.8
3.0
Target Applications
(Spec only for ZVS)
110VAC, 5W-15W
110VAC, 15W-25W
110VAC, 25W-35W
220VAC, 5W-15W
220VAC, 15W-25W
220VAC, 10W-20W
IRxxH214, HD214
IRxxH224, HD224
IRxxH737, HD737
IRxxH310, HD310
IRxxH320, HD320
IRxxH420, HD420
1) IC options for the half-bridge products include IR2101, IR2102, IR2103, IR2104, IR2151,
IR2152, IR2153, IR2154. Use the last two digits of the IC part number for the “xx”
designator.
2) The “H” option contains only the Control IC and MOSFET half-bridge. The “HD” option
contains the Control IC, Bootstrap Diode and MOSFET half-bridge.
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