tk75020 Toko Inc., tk75020 Datasheet - Page 5

• Manufacturer Part Number: tk75020
• Description: Zvs Resonant Controller
• Manufacturer: Toko Inc.

January 1999 TOKO, Inc.
T OFF(MAX)
T ON /SS
EA OUT
EA INV
V REF
V CC
GND
C T
EN
START-UP BIAS
EN0
R 2
1 K
R 1
1 K
Q 12
V CC
+2 V
B0
BANDGAP REF
TIMER
EN
V CC
1.25 V
V BE
OUT
A 2
A 1
+4 V
Q 3
Q 2
2 V BE
Q 9
Q 13
5.8/5.3 V
Q 1
ERROR AMP
REF BUFFER
SOFT START CMP
Q 5
Q 4
UVLO CMP
REF
ODP DISCHARGE CMP
REF CMP
Q 6
Q 10
Q 7
EN 1
Q 11
BLOCK DIAGRAM
EN 1
Q 8
EN 2
OVERDISSIPATION VOLTAGE PROTECTION
Q 14
V REF - V B
BUFFERED BIAS
ODP LATCH
V CC
Q 16
B 1
REF
B 2
R
HIGH: RAMP DOWN
ZVS DRIVE
1.5 V
Q
3 V
1 V
S
G 4
CMP 4
CMP 3
CMP 2
3.0 V
2.0 V
1.5 V
1.25 V
1.0 V
0.21 V
REF
R
S
Q
HIGH: DRV ENABLED
DRV
LATCH
G 1
CL LATCH
R
G 2
G 3
S
R
Q
Q
S
EN 3
G 5
ZVD CMP
B 1
C L CMP
STAND-BY GATE DISCHARGE
EN 4
Q 15
V CC
DRIVE
ODP CUR SRC
REF
BIAS
EN 3
50 µA
CURRENT LIMITER
0.21 V
Q 17
2.5/2.7 V
V CC
TK75020
D 1
REF
ODP
OVP
DRV
C L
ZVD
Page 5