A Product Line of
Diodes Incorporated
AP3790
PUMP EXPRESS
TM
COMPATIBLE AC/DC PSR CONTROLLER
Description
The AP3790 is a high accuracy and low cost switching mode power
supply controller to drive power bipolar transistor for 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 controller uses adaptive source current to optimize
driving current to reduce driving loss. 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 is
equal to the maximum system output current.
The output voltage of AP3790 can be adjusted based on the patterns
of load current aligned to MTK Pump Express protocol.
The AP3790 provides operating frequency Jitter function from light to
full load range to improve the power supply EMI performance. The
AP3790 also has built-in fixed cable voltage drop compensation (6%
of nominal system output voltage) and adjustable line voltage
compensation.
The AP3790 can work individually to achieve Ultra-Low standby
power under 5V output.
The AP3790 is packaged in SO-8.
Pin Assignments
(Top View)
CPC
GND
FB
VCC
1
2
3
4
8
7
6
5
NC
OUT
NC
CS
NEW PRODUCT
SO-8
Features
Compatible to MediaTek Pump Express
TM
Protocol
Ultra-Low Standby Power Consumption
Valley-turn On to Reduce Switching Loss and Benefit for EMI
Piece-wise Frequency Reduction to
Efficiency and Suppress Audio Noise
Audio Noise Suppression
Open Circuit Protection (OCkP)
Current Sense Resistor Short Protection
Over Voltage Protection (OVP)
Over Temperature Protection (OTP)
Short Circuit Protection (SCP) with Hiccup
Totally Lead-free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Enhance
Conversion
±5%
Constant Voltage Accuracy for 5V Output
Applications
Adapters/Chargers
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.
AP3790
Document number: DS37221 Rev. 3 - 2
1 of 17
www.diodes.com
October 2014
© Diodes Incorporated
A Product Line of
Diodes Incorporated
AP3790
Typical Applications Circuit
FR1
L1
TR1
D1
C7
R3
R12
+
C3
R11
R10
+
C4
D4~D7
C1
+
C2
+
R4
D2
R1
NEW PRODUCT
L2
C5
D3
5V/1A
Q1
AP3790
6
1
8
4
VCC
OUT
CPC
GND
FB
7
R13
3
C6
2
CS
5
R14
R2
Pin Descriptions
Pin Number
1
2
3
4
5
7
6, 8
Pin Name
CPC
GND
FB
VCC
CS
OUT
NC
Function
A capacitor is connected to this pin to form a low pass filter for cable voltage drop
compensation, audio noise suppression and detecting the patterns of load current to
change the output voltage and current
The ground of the controller
The CV and CC regulation are realized base on the voltage sampling of this pin
VCC supply pin for the controller. A capacitor with low ESR should be placed as
close as possible to this pin
Current senses pin of IC. The CS pin will turn off the power transistor when the CS
pin voltage reaches turn off threshold.
The OUT pin is used to drive the external power transistor
Not connected
AP3790
Document number: DS37221 Rev. 3 - 2
2 of 17
www.diodes.com
October 2014
© Diodes Incorporated
A Product Line of
Diodes Incorporated
AP3790
Functional Block Diagram
VCC
4
OVP
OCkP
SCP
OTP
R
CS
Short
Regulator
&
Bias
Pro
UVLO
NEW PRODUCT
FB
3
2
t
ONS
Detection
t
ONS
GND
Constant Voltage Control
Cable Compensation
Line
Compensation
V
LOAD
5V~3.6V_select
Vally-on
and
Driver
7
OUT
CS
5
Constant Current
Control
Frequency Jitter
t
ONS
t
ONS
Load
Detection
1
V
LOAD
Output Voltage
Selection
5V~3.6V_select
5V~3.6V_select
CPC
Absolute Maximum Ratings
(Note 4)
Symbol
V
CC
V
CS
, V
CPC
V
FB
I
SOURCE
T
J
T
STG
T
LEAD
θ
JA
ESD
Note 4:
Parameter
Supply Voltage
Voltage on CS, CPC Pin
FB Input Voltage
Source Current from OUT Pin
Operating Junction Temperature
Storage Temperature
Lead Temperature (Soldering, 10 sec)
Thermal Resistance (Junction to Ambient)
ESD (Human Body Model)
ESD (Machine Model)
Rating
-0.3 to 35
-0.3 to 7
-0.3 to 8
Internally Limited
-40 to +150
-65 to +150
+300
165
4000
300
Unit
V
V
V
A
°
C
°
C
°
C
°
C/W
V
V
Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “Recommended Operating Conditions” is not implied.
Exposure to “Absolute Maximum Ratings” for extended periods may affect device reliability.
AP3790
Document number: DS37221 Rev. 3 - 2
3 of 17
www.diodes.com
October 2014
© Diodes Incorporated
A Product Line of
Diodes Incorporated
AP3790
Electrical Characteristics
Symbol
(@V
CC
= 12V, T
A
= +25° unless otherwise specified.)
C,
Parameters
Conditions
Min
Typ
Max
Unit
STARTUP AND UVLO SECTION
V
TH_ST
V
OPR(MIN)
Startup Threshold
Minimal Operating Voltage
–
–
13
5.2
15.5
5.8
18
6.4
V
V
STANDBY CURRENT SECTION
NEW PRODUCT
I
ST
I
CC_QST
Startup Current
Quiescent Current
V
CC
= V
TH_ST
-1V before
startup
Static current @ OUT pin
no load
0
435
0.2
500
0.6
μA
565
DRIVING OUTPUT SECTION
R
DS(ON)
I
OUT(MAX)
Sink Resistance
The Maximum Source Current
1V @ OUT pin
–
2
25
2.4
32
2.8
39
Ω
mA
OPERATING FREQUENCY SECTION (5% Load to Full Load)
t
OFF(MAX)
Maximum Off Time
–
37% to 100% full load
t
SAMPLE
Sampling Time
4% to 37% full load
0% to 4% full load
(Note 5)
FREQUENCY JITTER
△V
CS
/V
CS
t
MOD
V
CS
Modulation
V
CS
Modulation Period
7% to 100% full load
–
2
230
3
256
4
282
%
μs
691
5.4
3.2
2.25
768
6
3.6
2.5
845
6.6
4.0
2.75
μs
μs
μs
μs
CURRENT SENSE SECTION
V
CS_H
V
CS_M
V
CS_L
R
LINE
t
LEB
Built-in Line Compensation Resistor
Leading Edge Blanking
V
CS_L
(Note 5)
CONSTANT VOLTAGE SECTION
V
FB
@5V
V
FB
@4.8V
V
FB
@4.6V
Feedback Threshold Voltage
V
FB
@4.4V
V
FB
@4.2V
V
FB
@4V
–
3.94
3.75
3.61
3.47
3.32
3.18
4.0
3.85
3.7
3.56
3.41
3.26
4.06
3.95
3.79
V
3.65
3.5
3.34
170
200
230
Current Sense Threshold
37% to 100% full load
4% to 37% full load
0% to 4% full load
(Note 5)
–
V
CS_H
and V
CS_M
830
550
320
160
425
900
600
350
200
500
970
650
380
240
575
ns
Ω
mV
AP3790
Document number: DS37221 Rev. 3 - 2
4 of 17
www.diodes.com
October 2014
© Diodes Incorporated
A Product Line of
Diodes Incorporated
AP3790
Electrical Characteristics
Symbol
V
FB
@3.8V
Feedback Threshold Voltage
V
FB
@3.6V
R
FB
V
CABLE
/V
OUT
%
FB Pin Input Resistance
Cable Compensation Ratio@5V
V
FB
=4V
–
(@V
CC
= 12V, T
A
= +25° unless otherwise specified.) (Cont.)
C,
Parameters
–
Conditions
Min
3.03
2.89
560
5
Typ
3.11
2.96
700
6
Max
3.19
Unit
V
3.03
840
7
kΩ
%
NEW PRODUCT
CONSTANT CURRENT SECTION
t
ONS
/t
SW
Maximum Secondary Duty Cycle
V
FB
=2V (Note 5)
0.47
0.5
0.53
–
DYNAMIC SECTION
V
UV_H
Under Voltage of Feedback Pin for V
CS_H
(Note 5)
3.61
3.68
3.75
V
OUTPUT VOLTAGE SELECTION SECTION
V
CPC_L
Current Control Threshold
V
CPC_H
t
ON_A
t
ON_B
Current Control Pattern Time
t
ON_C
t
OFF_D
t
WDT
Watch Dog Time
–
(Note 5)
50
50
180
100
100
210
150
150
240
ms
V
CPC
control_H
V
CPC
control_L
–
–
400
220
59
100
500
300
–
–
600
380
ms
mV
PROTECTION FUNCTION SECTION
V
FB(OVP)
V
CC(OVP)
V
OUT(OVP)
V
FB(SCP)
t
SCP
T
OTP
T
HYS
Over Voltage Protection
Over Voltage Protection at VCC Pin
Over Voltage Protection at OUT Pin
Short Circuit Protection
Maximum Time under V
FB(SCP)
Shutdown Temperature
Temperature Hysteresis
–
–
–
V
FB
@ Hiccup
–
–
–
7.1
27
3.4
1.61
116
+128
+36
7.5
30
3.65
1.7
128
+140
+40
7.9
33
3.9
1.79
140
+152
+44
V
V
V
V
ms
°
C
°
C
Note 5: Guaranteed by design.
AP3790
Document number: DS37221 Rev. 3 - 2
5 of 17
www.diodes.com
October 2014
© Diodes Incorporated
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