A 36W Ballast Application with NCP5104

AND8312/D
A 36W Ballast Application
with the NCP5104
Prepared by: Thierry Sutto
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NOTE: BEFORE PLUGGING IN THE DEMO BOARD,
MAKE SURE THE JUMPER IS ON THE CORRECT
POSITION: IF J2 IS USED, THEN Vin MUST BE
LOWER THAN 145 Vac.
This document describes how the NCP5104 driver can be
implemented in a ballast application. The scope of this
application note is to highlight the NCP5104 driver and not
to explain or detailed how to build electronic ballast.
The NCP5104 is a high voltage power MOSFET driver
providing two outputs for direct drive of 2 N-channel power
MOSFETs arranged in a half-bridge configuration with
only one input.
It uses the bootstrap technique to insure a proper drive of
the High-side power switch. The driver works with one
input to accommodate half-bridge topology with a fixed
dead time of 520 ns.
Detailed Operation
The lamp ballast is powered via a half bridge
configuration. The 2 power MOSFETs are driven with the
NCP5104 driver. The driver is supplied by the VCC rail, and
the high side driver is supplied by the bootstrap diode: when
the low side power MOSFET (Q2) is switched ON, the
BRIDGE pin is pulled down to the ground, thus the capacitor
connected between BRIDGE pin and VBOOT pin is
refuelled via the diode D3 and the resistor R5 connected to
VCC. When Q2 is switched OFF the bootstrap capacitor C6
supplies the high side driver with a voltage equal to VCC
level minus the D3 forward voltage diode. Given the
NCP5104 architecture, the driver copies the input signal to
the high side driver, then it generates a fixed dead time
(520 ns) before toggling the low side driver when the input
pin level changes.
Demo Board Specification
•
•
•
•
•
Input range : 85 Vac - 145 Vac OR 184 Vac - 265 Vac
Ballast Output Power : 36 W (type PL-L 36W)
Pre-Heating Current : 295 mA
Pre-Heating Time : 1 second
Nominal Current : 414 mA
Figure 1. Dead Time Between the High and Low-Side Driver
© Semiconductor Components Industries, LLC, 2007
November, 2007 - Rev. 0
1
Publication Order Number:
AND8312/D
AND8312/D
IN_HI
(10 V/div)
DRV_HI
(10 V/div)
IN_LO
(10 V/div)
DRV_LO
(10 V/div)
Time
(4 ms/div)
Figure 2. Input Output Timing Diagram
Tube
Voltage
(100
V /div)
Tube
current
(0.5 V /div)
Tube
Power
(50 W/div)
Tube
a verage
power = 32
Figure 3. Tube Signals
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2
W
3
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Figure 4. Demo Board Schematic
GND
200pF
R15
22k
C17
100mF
+
GND
R16
68k
27k
R12
GND
GND
C12
NC
GND
C13
NC
GND
+
GND
4
3
2
1
D5
GND
SD
IN
VCC
GND
1N4936
GND
C4
47mF
GND
5
6
7
D6
1N4936
R14
390k
R6
10R
GND
100nF
C6
R5
10R
C14
220pF/400V
DRV_IO
Bridge
DRV_HI
VBOOT
8
1N4936
U2
NCP5104
C5
100nF
D3
R9
10k
R7
10R
R8
10k
GND
Q2
IRF840LC
1.4mH
L1
Q1
IRF840LC
1kV
C15
6.8nF
BALLAST
B1
GND
220nF
NC
GND
1
6
7
R2
NC
R1
22k
R4
82k
2W
400V
C10
R11
47k
C12
NC
THR
GND
DIS
Q
GND
C2
47mF
400V
R3
82k
2W
C8
CVOLT
VCC
C3
220mF
GND
+
+
+ C1
47mF
100V
400V
5
TRIG
R
3
GND
D1
15V
1.3W
3
1
PT1
220nF
2
4
U1
TLC555C 8
R13
OR
F1
T500mA GND
2
4
C7
C16
R10
33k
CON2
1
2
J1
AND8312/D
AND8312/D
Figure 5. PCB Printout: Top and Bottom View
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4
AND8312/D
BILL OF MATERIAL
Part Type
Designator
Manufacturer
Description
Connector
B1, J1
-
Connector
47uF/400V
C1, C2
Panasonic
M Series
220pF
C10
Generic
Capacitor
10nF
C11
Generic
Capacitor
-
Capacitor
NC
C12, C13
220pF /400V
C14
Generic
Capacitor
6.8nF/1kV
C15
Generic
Capacitor
NC
C16
-
Capacitor
100uF
C17
Generic
Capacitor
220uF
C3
Generic
Capacitor
4.7uF/50V
C4
Generic
Capacitor
100nF
C5
Generic
Capacitor
100nF
C6
Generic
Capacitor
C7, C8
Generic
Capacitor
220pF
C9
Generic
Capacitor
BZX85C15V
D1
Generic
15V Zener diode
ON Semiconductor
Fast Recovery rectifier
220nF/400V
1N4936
D3, D5, D6
BZX85C5V1
D4
Generic
5V1 Zener diode
T500mA
F1
Generic
Fuse
US-jumper
J2
-
Jumper for US main supply only
1.4mH
L1
VOGT
VOGT 53-044
DF06M
PT1
-
600V Diode Bridge
IRF
Low Charge N-Channel MOSFET
IRF840LC
Q1, Q2
BC547B
Q3
Generic
NPN transistor
22k
R1
Generic
Resistor
33k
R10
Generic
Resistor
47k
R11
Generic
Resistor
27k
R12
Generic
Resistor
15k
R13
Generic
Resistor
390k
R14
Generic
Resistor
22k
R15
Generic
Resistor
68k
R16
Generic
Resistor
NC
R2
-
Resistor
R3, R4
Generic
Resistor 2W power type
10R
R5, R6, R7
Generic
Resistor
10k
R8, R9
Generic
Resistor
82k/2W
TLC555C
U1
Texas Instrument
CMOS 555 timer
NCP5104
U2
ON Semiconductor
NCP5104
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5
AND8312/D
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