— 31 —
GND
VREF
Ifmin
Rfmin
VCO
EN1
Vthe1
Vthe2
EN2
VS
VBOOT
OUT
C
BOOT
LOAD
H.V.
LVG
UV
DETECTION
Vs
HVG
BOOTSTRAP
DRIVER
HVG
DRIVER
LVG DRIVER
Css
VREF
Ifstart
Rfstart
Cf
OPAMP
+
–
OPOUT
OPIN–
OPIN+
DEAD
TIME
DRIVING
LOGIC
CONTROL
LOGIC
Iss
+
–
+
–
LEVEL
SHIFTER
12
5
6
7
4
2
3
1
9
8
10
11
14
15
16
Latch circuit reset
Thermal Shutdown circuit
Turn-on dead timer
ON width timer
Restart timer
Zero current detection
circuit
Standby circuit
Soft drive circuit
OCP threshold comparator
Burst mode OCP threshold comparator
UVLO comparator
Start-up circuit UVLO
comparator
Start-up circuit
OVP comparator
V
UL
V
OVP
V
ref
I
F/B
V
TH(OCL)
V
TH(burst limit)
R
S
Q
R
S
Q
Q1
VCC
VIN
Corrector
Emitter/OCL
GND
F/B
Z/C
V
cc(start)
/
V
cc(stop)
V
cc(startup off)
/
V
cc(startup on)
7
9
4
1
2
5
3
IC1603 Oscillator, Regulator
IC1602 Oscillator, Regulator
