Denon DRA-F107 - Block Diagram

37
DRA-F107 / DRA-F107DAB
ICE2B265 (IC92)
Blockdiagram
Thermal Shutdown
T
j
>140°C
Internal Bias
Voltage
Reference
6.5V
4.8V
Leading Edge
Blanking
220ns
Undervoltage
Lockout
Oscillator
Duty Cycle
max
Current-Limit
Comparator
x3.65
Soft-Start
Comparator
Current Limiting
PWM OP
Improved Current Mode
Soft Start
13.5V
8.5V
6.5V
C2 C1
16.5V
4.0V
R
FB
6.5V
Protection Unit
Power-Down
Reset
Power-Up
Reset
Power Management
C
Soft-Start
C
VCC
R
Start-up
85 ... 270 VAC
C
Line
VCC
GND
+
-
Converter
DC Output
V
OUT
f
standby
-f
norm
CoolSET™-F2
Optocoupler
Snubber
Spike
Blanking
5s
PWM
Comparator
R
SQ
Q
Error-Latch
C4
5.3V
C3
4.8V
R
Soft-Start
Gate
Driver
G3
G2
G1
G4
SoftS
5.3V
T1
V
csth
Propagation-Delay
Compensation
R
S
Q
Q
PWM-Latch
0.72
Clock
U
FB
f
osc
f
norm
f
standby
Standby Unit
FB
4.0V
R
Sense
Drain
Isense
0.8V
C5
0.3V
10k
D1
5.6V
CoolMOS™
ICE2Axxxx
ICE2Bxxxx
f
norm
f
standby
100kHz 21.5kHz
67kHz 20kHz
Duty Cycle Max
Pin Symbol Function
1 SoftS Soft-Start
2FB Feedback
3 Isense Controller Current Sense Input,
CoolMOS™ Source Output
4 Drain
650V
1)
/800V
2)
CoolMOS™ Drain
1)
at T
j
= 110°C
5 Drain
650V
1)
/800V
2)
CoolMOS™ Drain
2)
at T
j
=25°C
6 N.C Not connected
7 VCC Controller Supply Voltage
8 GND Controller Ground
1
6
7
8
4
3
2
5
VCCFB
Is ens e
Dr ain
Sof tS
N.C
GND
Dr ain