FAN1577A Fairchild Semiconductor, FAN1577A Datasheet - Page 5

• Manufacturer Part Number: FAN1577A
• Description: The FAN1577A is a high-efficiency, voltage-mode, dual-channel, synchronous DC/DC PWM controller for two independent outputs
• Manufacturer: Fairchild Semiconductor

© 2010 Fairchild Semiconductor Corporation
FAN1577A • Rev. 1.0.0
Electrical Characteristics
V
V
Oscillator
Error Amplifier
Two-Stage Soft-Start
V
Protections
Output
Total Operating Current
Notes:
1.
2.
V
V
CC
CC
SS_TRANSITION
Symbol
H RAMP_PEAK
RAMP_VALLEY
D
V
T
F
I
V
△V
I
=12V and T
I
I
SOURCE
I
I
CC_SBY
UVLO
ON_MAX
OT_HYS
V
CC_HYS
F
V
A
OCSET
CC_OP
Not tested in production; 30 pieces sampled.
When V
OSC,RT
I
SRC_1
SRC_2
I
CC_ON
BW
R
R
T
T
SINK
SINK
I
I
OSC
OVP
DH
REF
VOL
DL
OT
DH
DT
DL
REF
DL
Turn-On Threshold
UVLO Hysteresis
Oscillator Frequency
Total Accuracy
Maximum Duty Cycle
Internal Reference Voltage
V
Open-Loop Voltage Gain
Output Source Current
Output Sink Current
Peak of V
Valley of V
1
2
Soft-Start Transition Point
Soft-Start Discharge Current
OC Sink Current
Over-Temperature
Over-Temperature Hysteresis
Over-Voltage Protection of IN
High-Side Current Source
High-Side Sink Resistor
Low-Side Current Source
Low-Side Sink Resistor
Dead Time
Operating Supply Current
Standby Current (Disabled)
Unity Gain Bandwidth
A
falls less than 2V relative to V
= -40°C to +85°C unless otherwise noted.
st
nd
REF
Soft-Start Charge Current
Soft-Start Charge Current
Temperature Coefficient
RAMP
Parameter
RAMP
(2)
(1)
DH
rising to 2V.
V
V
R
R
20kΩ＜R
V
T
IN1=IN2=0.6V
IN1=IN2=0.8V
Gate Output=D
No Gate Output
V
V
I
I
See Figure 6
V
V
V
V
V
V
V
V
V
V
SS1/ENB=SS2/ENB=0V
SOURCE_1
SOURCE_2
A
CC
CC
RT
RT
CC
CLP
CLP
CLP
CC
OVP
BST
CLN
BST
CC
CC
CC
CC
=-40~85
=OPEN
=GND
=8V, V
=12V
=12V, V
=12V
=12V, D
=12V, No Load
Ramp-Up
Ramp-Down
＜V
＜V
＞V
=6V
/V
- V
- V
IN
CLN
CLN
CLN
CLN
CLN
st
nd
Conditions
RT
5
CC
Transit to
o
=12V, V
=12V
, V
, V
C
DL
H
=15V, T
& D
SS_Transition
SS_Transition
=6V
ON_MAX
L
=1000pF
DH
A
=25°C
-
＞V
＜V
SS
SS
0.693
Min.
2.45
1.05
1.40
308
250
118
9.5
1.5
-10
1.0
1.0
3.3
85
55
60
28
13
90
50
0.700
Typ.
10.0
0.03
2.80
1.20
1.42
340
400
120
150
122
2.0
3.5
1.8
2.8
1.8
2.8
4.3
0.7
90
20
61
77
80
35
16
50
70
Max.
0.707
10.5
3.15
1.35
1.44
372
100
600
150
126
2.5
3.8
3.8
5.3
1.0
67
10
95
42
19
90
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MV/
Unit
MHZ
KHZ
MA
DB
NS
MA
µA
µA
µA
µA
µA
µA
°C
°C
%
%
%
Ω
Ω
V
V
V
V
V
V
A
A
O
C