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6. Block diagram
5
GND
1
CT
VDD
VREF
7
14
3V
SUPPLY
reference
voltages
digital
supply (5 V)
analog
VDD(L)
PREHEAT TIMER
reset
LOGIC
Vpd
BOOTSTRAP
UBA2014
DRIVER
LOGIC
STATE LOGIC
• reset state
• start-up state
• preheat state
• ignition state
• burn state
• hold state
• power-down state
LEVEL
SHIFTER
HS
DRIVER
LS
DRIVER
9
FVDD
10
GH
11
SH
6
GL
ANT/ CMD
12
ACM
PCS
8
PCS
VOLTAGE
CONTROLLED
OSCILLATOR
REFERENCE
I
CURRENT
V
4
3
IREF
CF
Fig 1. Block diagram
LAMP
VOLTAGE
SENSOR
Vlamp(fail)
Vlamp(max)
13
LVS
LOGIC
FREQUENCY
CONTROL
AVERAGE
CURRENT
SENSOR
2
CSW
15
CSP
16
CSN
mgw579