HR2000
Fluorescent Lamp HB Driver with PFC
The Future of Analog IC Technology
DESCRIPTION
FEATURES
The HR2000 is a fluorescent lamp ballast
controller with PFC function and high voltage
half-bridge driver. Only 16pin is used to offer
cost effective solutions with minimized external
components.
PFC PART
• Only four pins realize PFC function.
• Ton control.
• Boundary Conduction Mode operation.
• Less peripheral components.
• Over voltage and over current protection.
The HR2000 can properly drive the two
MOSFETs of half-bridge to control fluorescent
lamp, ensuring all the features at the same
time. The operating frequency is programmable
and the sweeping frequency is controlled to
limit the preheat current. The preheat time and
ignition time can be smartly set up for types of
lamps and applications. Sufficient protection
functions are provided for different fault modes
such as over voltage, over current, over
temperature, capacitive mode, end of life (EOL).
Preheat driving signal is offered in preheat state
to meet low power loss application which
usually needs a MOSFET to cut off filament
transformer.
The PFC part only uses 4 pins to realize PFC
function with On-time (Ton) control at boundary
conduction mode (BCM). It is suitable for wide
input range. Over voltage protection and over
current protection are integrated for the PFC
part.
HALF-BRIDGE PART
• 600V bootstrap half-bridge driver.
• Programmable preheat current.
• Programmable preheat time.
• Programmable ignition time.
• Single ignition attempt.
• Over voltage protection.
• Over current protection.
• End-Of-Life protection
• Capacitive mode protection.
• Minimized external components.
• Over temperature protection
APPLICATIONS
•
•
Tube fluorescent lamp ballast
Compact fluorescent lamp ballast
All MPS parts are lead-free and adhere to the RoHS directive. For MPS green
status, please visit MPS website under Quality Assurance. “MPS” and “The
Future of Analog IC Technology” are Registered Trademarks of Monolithic
Power Systems, Inc.
The HR2000 is available in the 16-pin SOIC16
package.
HR2000 Rev. 1.0
2/20/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
1
HR2000 — FLUORESCENT LAMP HB DRIVER WITH PFC
TYPICAL APPLICATION
D105
D103
D101
D106
T101
*
R108
*
C101
Mains
Q101 C102
R104
D102
D104
R105
R111
R106
D107
R103
R109
R101
R102
R110
R107
C103
D201
C210
R206
C208
VO
ZCD
OVC
CT
FC
CP/EOL
REF
Pre/FT
C104
C201
C202
C203
R201
HR2000
16
1
15
2
3
14
4
13
5
12
6
11
7
10
8
9
Z201
GATE
GND
VCC
LG
CS
SW
UG
BST
C206
Q201
C209
L201
Lamp
Q202
C204
R204
C207
C205
R203
R208
C211
C213
R207
R205
R202
D202
D203
C212
R209
Figure 1
HR2000 Rev. 1.0
2/20/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
2
HR2000 — FLUORESCENT LAMP HB DRIVER WITH PFC
ORDERING INFORMATION
Part Number*
Package
Top Marking
HR2000GS
SOIC16
HR2000
* For Tape & Reel, add suffix –Z (e.g. HR2000GS–Z).
PACKAGE REFERENCE
HR2000 SOIC16 PACKAGE (TOP VIEW)
HR2000 Rev. 1.0
2/20/2013
VO
1
16
GATE
ZCD
2
15
GND
OVC
3
14
VCC
CT
4
13
LG
FC
5
12
CS
CP/EOL
6
11
SW
REF
7
10
UG
Pre/FT
8
9
BST
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
3
HR2000 — FLUORESCENT LAMP HB DRIVER WITH PFC
LIMITING VALUE (1)
A
B
C
D
E
F
G
H
I
I
J
K
L
Condition
Operation
High side floating supply voltage
Voltage at SW
Voltage at pin CS
Current in pin CS
Voltage at pin UG
Voltage at pin LG
Low voltage supply
Low voltage supply
Clamp current in pin VCC
Voltage at pin ZCD
Voltage at pin OVC
Current in pin VO
Current in pin CT
Note7
tVvcc(reset), this pin will be detected.
If VPreFT>Vfault(reset), IC will not start up.
Non oscillating state:
VCC under voltage state
In non-oscillating state, IC stops to work. There
are 4 sub-states:
Start up state;
Fault state;
There is a hysteresis for Vcc detection. When
power on, HR2000 begin’s to work after
Vvcc>Vvcc(start). If VvccVfault(reset), then IC will not start up.
The second one is after Pre/FT pin’s detection
function is active in all oscillating sub-states,
HR2000 will get into Fault state if Pre/FT pin
voltage VPreFT>Vfault(ref) & low side drive is
high.
The following items will affect Pre/FT pin in
oscillation state.
The voltage detected by the sample circuit such
as C211, C212, C213, D202, R204, R205 in Fig1.
Preheat state;
Ignition state;
Burn state;
Half-bridge oscillator
The oscillating frequency is programmed by the
capacitor on CT pin. The capacitor on CT pin is
charged by internal current source which is
related to REF pin resistor and FC pin voltage
which is voltage controlled current source for CT
pin. The waveform of CT pin is saw-tooth and its
frequency is twice of the half-bridge operating
frequency. There is a dead time between UG and
LG for ensuring their non-overlap operating. The
dead time is defined by REF resistor.
FC pin controls the operating frequency directly.
Higher Vfc results in a lower frequency.
HR2000 Rev. 1.0
2/20/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
14
HR2000 — FLUORESCENT LAMP HB DRIVER WITH PFC
Preheat State
When Vvcc>Vvcc(start) & VPreFTVcs(pre) in a switching period,
the FC pin will be discharged by an internal
current source IFC(disch) cycle-by-cycle. This
controls the working frequency.
EOL protection
Capacitive mode protection
Current limit
VCC low protection
Ignition State
Over temperature protection
Ignition state follows preheat state closely. In this
state, EOL protection and CS(pre) limit are
disabled. FC voltage increases which results in
frequency decreasing. Then the voltage on lamp
gets higher and higher to ignite the lamp.
EOL protection
‘End of Life’(EOL) protection is enabled after
CP/EOL is dropped to Veol(middle). There is a
window comparator for this protection. If the
voltage on CP/EOL pin get out of
Veol(low)~Veol(high), then the current source
Ifault(ch) will charge the capacitor at Pre/FT pin.
If VPreFT>Vfault(ref), then HR2000 will get into
fault state.
CP/EOL pin also only takes timing function in this
state. Once preheat state is over, Pre/FT pin is
dropped to Vfault(reset2), and then the detection
function is active. If Pre/FT pin VPreFT>Vfault(ref)
& low side drive is high, then HR2000 will
consider it is fault state.
After preheat state, CS pin over current
protection is active and limits CS voltage (power
stage current).
When Vcs>Vcs(clamp) @ low side drive=high,
the impedance of CS pin will become very small
and a current flows into this pin. The koc of this
current will charge the CT pin to increase
frequency. The low side MOSFET will be turned
off quickly while high side MOSFET will not be
affected. This results in a narrow turn on time of
low side MOSFET and a relatively larger turn on
time of high side MOSFET. This asymmetric
operation of half bridge limits the output power.
Burn state
After ignition state, Burn state is entered. At the
beginning of burn state, CP/EOL pin will be
dropped to the middle level of the EOL detection
HR2000 Rev. 1.0
2/20/2013
This protection is disabled in PFC Vo-low state.
Capacitive mode protection
The capacitive mode protection is active during
all oscillating states. It is detected by the voltage
on CS at the moment of turning on of low side
MOSFET. If at this moment, Vcs>Vcs(cap), then
capacitive mode is confirmed and FC pin is
discharged at this switching cycle. VFC will
decrease towards zero which means the
maximum frequency if the capacitive mode
always exists. If capacitive mode @ fmax is
detected, then Ifault(ch) is actived to charge the
capacitor at Pre/FT pin.
Current limit
The current limit is realized on CS pin. There are
three kinds of limitation on CS pin.
Vcs(pre) in preheat state;
Vcs(clamp) of over current protection function in
oscillating states;
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
15
HR2000 — FLUORESCENT LAMP HB DRIVER WITH PFC
Capacitive protection in oscillating states.
They have been described in the related states
above.
VCC low protection
It is mentioned in VCC under voltage state.
Over temperature protection (OTP)
It is described in OTP state.
PFC part
In the typical application, PFC can be defined to
3 states:
Normal state;
VO-low state;
OVC state;
The Ton is set by the voltage at Vo pin. Higher
Vvo, shorter Ton. The circuit in Fig1 shows the
example. ZCD pin detects the inductor current
zero-crossing point. When The Vzcd
Vvo(off), Ton is zero, and GATE pin is low.
The minimum turn off time is set internally to
1.4µs.
Vo-low state
In case of main voltage too low, PFC may not
maintain its intended output voltage. In order to
keep on working, the current sunk into Vo pin
is monitored. If it is lower than Ivo(low) the IC will
get into Vo-low state.
Normal state
In Vo-low state:
PFC works at boundary conduction mode (BCM)
with Ton control. Fig3 shows the internal block.
There is a current Ifault(disch) to discharge
Pre/FT pin. This can increase the protection level.
EOL protection is disabled.
VovcVovcref or Vovc
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