AP3785T Datasheet, PDF (6/18 Pages) Diodes Incorporated – PRIMARY SIDE REGULATED SWITCHING MODE POWER SUPPLY CONTROLLER

Electrical Characteristics (Cont.) (@VCC=15V, TA=+25°C, unless otherwise specified.)
Symbol
Parameter
Conditions
OPERATING FREQUENCY SECTION (NL MODE TO FULL LOAD)
fS(MAX)
The Maximum Operating Frequency 100% full load
tsample_H
tsample_L
Sample Time
40% to 100% full load
NL Mode to 8% full load
OPERATING FREQUENCY SECTION (NL MODE)
VCBC(EN)
CBC Pin Voltage to Enter NL Mode –
tOFF(EN)
Off Time to Enter NL Mode
From the end of tONS
tOFF(EX)
Off Time to Exit NL Mode
From the end of tONS
FREQUENCY JITTER
ΔVCS/VCS
VCS Modulation
fMOD
VCS Modulation Frequency
NL to full load
CURRENT SENSE SECTION
VCS_H
VCS_L
Peak Current Sense Threshold
Voltage
40% to 100% full load
0% to 8% full load
RLINE
Built-in Line Compensation Resistor (Note 8)
tLEB
Leading Edge Blanking
–
CONSTANT VOLTAGE SECTION
VFB
VCBC(MAX)
Feedback Threshold Voltage
Maximum CBC Voltage for Cable
Compensation
CONSTANT CURRENT SECTION
tONS/tSW
Secondary Winding Conduction
Duty
VALLEY-ON SECTION
Closed loop test of VOUT
–
Tested @ VFB=2V
tVAL-ON
Valid Off Time of Valley-on
DYNAMIC SECTION
VTRIGGER
tDELAY
Trigger Voltage for Dynamic
Function
Delay Time for Dynamic
Function
VUV_H
Under Voltage of FB Pin for VCS_H
From the end of tONS
–
From the end of tONS
–
PROTECTION FUNCTION SECTION
VFB(OVP)
Over Voltage Protection at FB Pin
–
VCC(OVP)
Over Voltage Protection at VCC Pin –
tONP(MAX)
Maximum Turn-on Time
–
tOFF(MAX)
Maximum Off Time
–
Min
–
4.8
2.4
55
168
168
4.5
1.8
537
243
108
400
2.45
1.4
–
20
40
99
2.23
3.5
27
14
11
Typ
–
5.2
2.7
60
224
224
5
2
565
255
120
625
2.50
1.45
4/8
27
62.5
127
2.27
3.75
28.5
18
14
AP3785T
Max
Unit
80
kHz
5.7
s
3.0
s
65
mV
280
s
280
s
5.5
%
2.2
kHz
593
mV
267
mV
132

850
ns
2.55
V
1.5
V
–
–
34
s
85
mV
155
s
2.32
V
4
V
30
V
22
s
17
ms
AP3785T
Document number: DS37552 Rev. 4 - 2
6 of 18
www.diodes.com
September 2015
© Diodes Incorporated