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PDF AP3783R Data sheet ( Hoja de datos )
| Número de pieza | AP3783R | |
| Descripción | PRIMARY SIDE REGULATED SWITCHING MODE POWER SUPPLY CONTROLLER | |
| Fabricantes | Diodes | |
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AP3783R
PRIMARY SIDE REGULATED SWITCHING MODE POWER SUPPLY CONTROLLER
Description
Pin Assignments
The AP3783R is a high frequency, high efficiency and high accuracy
switching mode power supply controller to drive power MOSFET for
5V/2A battery charger/adapter applications. The controller regulates
the output voltage and current in the primary side by piece-wise Pulse
Frequency Modulation (p-PFM) in discontinuous conduction mode
(DCM). The system operating frequency reduces linearly from heavy
load to light load in each interval of the p-PFM, and enters constant
current mode when the load current equals to the maximum system
output current.
The AP3783R provides accurate constant voltage (CV), constant
current (CC) and outstanding dynamic performance without requiring
an opto-coupler. It also eliminates the need of loop compensation
circuitry while maintaining stability.
The AP3783R provides valley turn-on function and 3-Segment drive
current to improve the power supply EMI performance. The AP3783R
also has built-in fixed cable voltage drop compensation (8%, 4% and
2% of nominal system output voltage to meet various cables with
different length and gauge) and adjustable line voltage compensation.
The AP3783R achieves excellent regulation and high average
efficiency, less than 2s startup time for 30mW standby power solution.
When AP3783R is used with APR3415, good undershoot and
efficiency performances can be achieved.
The AP3783R is packaged in SOT26.
Applications
Adapters/Chargers
Standby and Auxiliary Power Supplies
(Top View)
Pin 1 Mark
CS 1
GND 2
VCC 3
6 CPC
5 DRI
4 FB
SOT26
Features
Less than 30mW Standby Power Consumption
Meet Efficiency Requirement of COC Trier2
Valley Turn-on to Reduce Switching Loss and Improve EMI
Piece-wise Frequency Reduction to Enhance Conversion
Efficiency and Suppress Audio Noise
Over Voltage Protection (OVP)
Over Temperature Protection (OTP)
Short Circuit Protection (SCP) with Hiccup
3-Segment Drive Current for Radiative EMI Suppression
Operating Frequency Jitter Function for Conductive EMI
Suppression
Drive MOSFET for 5W to 20W Battery Charger/Adapter
Applications
SOT26 SMD Package Comply with Level 3 of IPC/JEDEC J-STD-
033A
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
AP3783R
Document number: DS37448 Rev. 5 - 2
1 of 17
www.diodes.com
October 2015
© Diodes Incorporated
1 page  
AP3783R
Electrical Characteristics (Cont.) (@VCC=15V, TA=+25°C, unless otherwise specified.)
Symbol
Parameter
FREQUENCY JITTER
ΔVCS/VCS
VCS Modulation
fMOD VCS Modulation Frequency
CURRENT SENSE SECTION
VCS_H
VCS_L
Peak Current Sense Threshold
Voltage
RLINE
Built-in Line Compensation Resistor
tLEB Leading Edge Blanking
CONSTANT VOLTAGE SECTION
VFB Feedback Threshold Voltage
RFB FB Pin Input Resistance
VCABLE/VOUT% Cable Compensation Ratio
CONSTANT CURRENT SECTION
tONS/tSW
Secondary Winding Conduction
Duty
VALLEY-ON SECTION
tVAL-ON
Valid Off Time of Valley-on
DYNAMIC SECTION
VTRIGGER
Trigger Voltage for Dynamic
Function
tDELAY
Delay Time for Dynamic Function
VUV_H
Under Voltage of FB Pin for VCS_H
tOFF(MAX)
Maximum Off Time
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
VFB(SCP)
Short Circuit Protection
tSCP Maximum Time under VFB(SCP)
TOTP
Shutdown Temperature
THYS
Temperature Hysteresis
Conditions
6.5% to 100% IO(MAX)
37% to 100% IO(MAX)
0% to 37% IO(MAX)
(Note 7)
(Note 6)
Closed loop test of VOUT
VFB=4V
AP3783RA
AP3783RB
AP3783RC
VFB=4V
From the end of tONS
–
From the end of tONS
–
–
–
–
–
VFB @ Hiccup
–
–
–
Notes:
5. The output constant-current design value, generally set to 110% to 120% of full load.
6. Guaranteed by design.
7. Line compensation voltage on CS reference: Δ
VCS _ REF
0.438 RLINE
RFB1 RLINE
VAUX
Min
4.5
3.6
828
460
245
400
3.95
560
7
3
1
0.47
14.4
74
115
3.82
6
7.1
28
13
2.45
115
+126
+36
Typ
5
4
900
500
260
500
4.01
700
8
4
2
0.5
16
83
128
3.89
8
7.5
30
19
2.6
128
+140
+40
Max
5.5
4.4
972
540
275
600
4.07
840
9
5
3
0.53
17.6
92
141
3.96
10
7.9
32
25
2.75
141
+154
+44
Unit
%
kHz
mV
mV
ns
V
k
%
%
%
–
μs
mV
μs
V
ms
V
V
μs
V
ms
ºC
ºC
AP3783R
Document number: DS37448 Rev. 5 - 2
5 of 17
www.diodes.com
October 2015
© Diodes Incorporated
5 Page 
Operation Principle Description (Cont.)
VCS_REF
VCS_H
VCS_L
Light-load
High-load
AP3783R
fSW
80kHz
65kHz
24kHz
0.5kHz
5%
37%
full load IO(MAX)
Figure 4. Multiple Segment Peak Current at CV Mode
It can be seen from Figure 4, with multiple segment peak current control, AP3783R power system can keep switching frequency above 24kHz
at whole heavy load and most of light load to guarantee the audible noise free performance.
Constant Voltage Operation in LL Mode and Dynamic Response
In primary side regulation of AP3783R application, APR3415 must be used at secondary side as the output voltage regulator, low standby power
and excellent dynamic response can be achieved. When the output voltage detected by APR3415 is lower than its trigger voltage, APR3415
outputs periodical signals which will be coupled to auxiliary side. When AP3783R detects the signal which is valid that the signal voltage is higher
than VTRIGGER and tOFF is longer than tDELAY, AP3783R will begin an operating pulse, then primary switch immediately turns on to provide one energy
pulse to output terminal and primary VCC.
By fast response and cooperation, APR3415 and AP3783R can maintain a constant output voltage with very low operating frequency in LL mode
and also can effectively improve dynamic performance for primary side regulation power system.
The conditions of entering LL mode---VCPC<20mV and tOFF>256μs.
The condition of exiting LL mode---VCPC ≥40mV or tOFF<256μs.
The critical point of the LL mode is generally about 5% IO(MAX).
3-Segment Drive Current for Radiative EMI Suppression
When the power switch is turned on, a turn-on spike will occur, that worsens the radiative EMI. It is an effective way to decrease drive current
before gate voltage gets to miller platform. The AP3783R uses 3-segment drive current for radiative EMI suppression, as shown in Figure 5.
When gate voltage gets to 6V, the AP3783R drive current switches from low current (43mA) to high current (110mA). When the gate voltage
gets to 10V, the drive current will decrease gradually to 0mA until the gate voltage goes up to the clamp voltage (11V).
AP3783R
Document number: DS37448 Rev. 5 - 2
11 of 17
www.diodes.com
October 2015
© Diodes Incorporated
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet AP3783R.PDF ] | |
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