FAN6204 Fairchild Semiconductor, FAN6204 Datasheet - Page 6

• Manufacturer Part Number: FAN6204
• Description: FAN6204 is a secondary-side synchronous rectification (SR) controller to drive SR MOSFET for improving efficiency
• Manufacturer: Fairchild Semiconductor

© 2010 Fairchild Semiconductor Corporation
FAN6204 • Rev. 1.0.1
Electrical Characteristics
Unless otherwise specified, V
LPC Section (Continued)
RES Section
V
Internal Timing Section
Ratio
Green Section
Causal Function Section
Internal Over-Temperature Protection Section
Note:
3.
V
t
t
t
t
t
GREEN-ENTER
DEAD-CAUSAL
t
DEAD-RE-CFR
t
K
GREEN-TIME-
GREEN-TIME-
Symbol
T
LPC-CLAMP-H
RES-CLAMP-H
t
LPC-EN-RES
t
t
GREEN-OFF
t
V
t
GREEN-ON
V
RES-DROP
V
DEAD-CFR
t
t
LPC-HIGH
RES-LOW
RES-DROP
t
OTP-HYST
gate-limit
CAUSAL
LPC-EN
LPC-DIS
V
T
RES-EN
DD-RES
leave
enter
Guaranteed by design.
t
OTP
CT
LPC
LPC-RES
Higher Clamp Voltage
LPC Voltage to Disable SR Gate
Debounce Time for Disable SR Gate
No LPC Signal, Reset V
Threshold Voltage of V
Debounce Time for Disable RES Function
Higher Clamp Voltage
RES Dropping Protection Ratio within One Cycle
Debounce Time for RES Dropping Protection
Linear Operation Range of CT
Linear Operation Range of LPC for
CT Charge
Linear Operation Range of V
for CT Discharge
Ratio Between LPC and RES
Minimum LPC Time to Enable SR_Gate, V
t
CT Capacitor t
Green Mode
CT Capacitor t
Green Mode
Cycle Time to Enter Green Mode
Cycle Time to Leave Green Mode
No Gate Signal to Enter Green Mode
If t
SR Stops Switching, Enter
Green Mode
SR Turn-off Dead Time by Causal
Function
CFR Start to Shrink Timing (Last
Time from SR Gate Falling to LPC
Rising)
SR Gate Narrowed Down Width when t
Internal Threshold Temperature for OTP
Hysteresis Temperature for Internal OTP
on-SR
S-PWM
(n+1)< t
(n+1) > t
Parameter
gate-limit
DIS
DIS
DD
CAUSAL
Time to Leave
Time to Enter
=4.5V~25V and T
x t
on-SR
(3)
(3)
xt
RES
S-PWM
LPC-EN
(n)
to Enable SR MOS
DD-RES
(n)
A
V
V
V
V
V
f
f
CT Discharge Time < t
CT Discharge Time > t
f
f
CFR (Causal Function Regulator)
=-40°C ~ 105°C.
S
S
(3)
S
S
LPC
DD
DD
DD
DD
=65KHz
=65KHz
=65KHz  40KHz
=65KHz
DEAD-CFR
<5V
>5V
<5V
>5V
(3)
=1.5V
(3)
DET
6
>V
Conditions
Triggered
DET_TH_HIGH
GREEN-ON
GREEN-OFF
Min.
0.60
4.65
4.60
4.25
105
380
0.8
0.8
0.8
0.8
0.9
4.0
27
Typ.
0.75
5.00
5.35
4.80
100
120
580
150
140
4.2
1.5
1.1
1.5
90
30
75
20
6
1
1
6
3
7
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Max.
0.90
5.35
6.10
5.35
120
780
4.4
3.4
4.0
3.4
4.0
1.3
33
2
Times
Times
Unit
s
s
µs
µs
s
µs
µs
µs
µs
ns
s
°C
°C
ns
%
%
%
V
V
V
V
V
V
V
V