FA3686 Datasheet, PDF (3/18 Pages) List of Unclassifed Manufacturers – For Switching Power Supply Control

FA3686V
Oscillator section (RT pin)
Item
Oscillation frequency
Line regulation
Variation with temperature
Symbol
fOSC
fOSC_LINE
fOSC_TC1
Test condition
VCC=2.5 to 18V
Ta=–30 to +85˚C
Min.
435
Typ.
500
±1
±3
Max. Unit
565 kHz
±5
%
%
Error amplifier section (IN1–, FB1, IN2–, FB2, IN3–, FB3 pin)
Item
Reference voltage (CH.1)
Reference voltage (CH.2)
Reference voltage (CH.3)
Symbol
VREF1
VREF2
VREF3
Test condition
*¹
*²
*³
Min.
0.99
0.98
0.98
Typ.
1.00
1.00
1.00
Max.
1.01
1.02
1.02
VREF Line regulation
VREF_LINE VCC=2.5 to 18V
±2
±5
VREF Variation with temperature
Input bias current
VREF_TC1
IIN–
Ta=–30 to +85˚C
VINx–=0.0 to 2.5V *⁴
±0.5
0.0
Open loop gain
AVO
70
Unity gain bandwidth
Output current (sink)
Output current (source)
fT
ISIFB
ISOFB
VFBx=0.5V, VINx–=VREG *⁴
2.3
VFBx=VREG–0.5V, VINx–=0V *⁴ –360
1.5
3.5
–270
4.7
–180
*¹ The FB1 voltage is measured under the condition that IN1- pin and FB1 pin are shorted. The input offset voltage of the error amplifier is included.
*² The FB2 voltage is measured under the condition that IN2- pin and FB2 pin are shorted. The input offset voltage of the error amplifier is included.
*³ The FB3 voltage is measured under the condition that IN3- pin and FB3 pin are shorted. The input offset voltage of the error amplifier is included.
*⁴ The “x” of INx- and FBx refers to 1 to 3.
Unit
V
V
V
mV
%
mA
dB
MHz
mA
µA
Soft start section (CS1, CS2 pin)
Item
Threshold voltage (CS1)
Threshold voltage (CS2)
Charge current of CS2 (source)
Charge current of CS2 (sink)
Symbol
VCS1D0
VCS1D20
VCS1D80
VCS2D0
VCS2D20
VCS2D80
ICS1
ICS2
Test condition
Duty cycle=0%, VFB1=1.4V
Duty cycle=20%, VFB1=1.4V
Duty cycle=80%, VFB1=1.4V
Duty cycle=0%, VFB2=0.7V
Duty cycle=20%, VFB2=0.7V
Duty cycle=80%, VFB2=0.7V
VCS1=0.5V
VCS2=VREG–0.5V
Min.
0.89
1.25
1.20
0.84
–2.
1.5
Typ. Max. Unit
0.82
V
0.925 0.96 V
1.285 1.32 V
1.33
V
1.235 1.27 V
0.875 0.91 V
–2.0 –1.5 µA
2.0
2.4
µA
Pulse width modulation (PWM) section (FB1, FB2 pin)
Item
Max. duty cycle of OUT1
Max. duty cycle of OUT2
Threshold voltage of FB1
Threshold voltage of FB2
Symbol
DMAX1
DMAX2
VFB1D0
VFB1D20
VFB1D80
VFB2D0
VFB2D20
VFB2D80
Test condition
fOSC=300kHz
RT=12kΩ (fOSCԼ500kHz)
fOSC=1.5MHz
fOSC=300kHz
RT=12k (f OSCÔ¼500kHz)
fOSC=1.5MHz
Duty cycle=0%
Duty cycle=20%
Duty cycle=80%
Duty cycle=0%
Duty cycle=20%
Duty cycle=80%
Min.
80
80
Typ. Max. Unit
87
%
85
90
%
78
%
88
%
85
90
%
73
%
0.82
V
0.925
V
1.285
V
1.33
V
1.235
V
0.875
V
3