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MITSUMI
Secondary Control for Energy-saving AC Adaptors MM1529
Secondary Control for Energy-saving AC Adaptors
Monolithic IC MM1529
Outline
This IC is a secondary control IC for AC adaptors with energy-saving mode, and switches to energy-saving mode when there is no load current flowing to reduce AC adaptor power consumption. When normal mode load current flows, it switches automatically to normal mode and supplies power in response to the load. To control the primary oscillator, this IC controls two photocouplers for rated voltage rated current control and switching between energy-saving and normal modes.
Features
(1) (2) (3) (4) (5) (6) Automatic switching between energy-saving mode and normal mode Current consumption (energy-saving mode) 60A Current consumption (normal mode) 1.7mA Reference voltage (internal/output inversion voltage) 1.250V25mV Uses two photocouplers to control primary side oscillator. Photocouplers are for rated voltage rated current control and switching between energy-saving and normal modes.
Package
SOP-8D
Applications
(1) AC adaptors (celler phones, movies, PDA, laptop PCs, others) (2) Chargors (celler phones, movies, PDA, laptop PCs, others)
Pin Connetion Diagram
8
7
6
5
1 2
PO1 PO2 GND CS
5 6 7 8
REF OUT CNT VCC
1
2
3
4
3 4
SOP-8D
MITSUMI
Secondary Control for Energy-saving AC Adaptors MM1529
Block Diagram
RLS L1
Secondary transformer
Load detection resistor
RL1 PC2
For load detection
RL2
For rated current rated voltage
RLB
ROS1
PC1
PO2
2
PO1
1
VCC
8
CNT
7
OUT
6
REF
5
COUT
VCC
Voltage drop detection
(1.0V)
Load connect detection
ROS2
Input/output error control
(0.2V)
(0.2V)
REF control
(1.25V)
Rated current control
Reference voltage drop GND
(0.1144V)
4
RCS
3
CS
Rated current detection resistor
MITSUMI
Secondary Control for Energy-saving AC Adaptors MM1529
Terminal Explanation
Pin No. Pin name Function Rated current rated voltage control photocoupler LED drive pin.Connects cathode side of diode. Output load detection photocoupler LED drive pin. Connects cathode side of diode. Ground pin. Overcurrent detection pin. Doubles as output- pin. Connects overcurrent resistor to GND pin. Reference voltage input pin. Connects R1 resistor to the OUT pin and R2 resistor to GND pin to control output pin. Output voltage={1+ (ROS1/ ROS2)} 1.25 Output +pin. Connects load detection resistor to Vcc pin and connects PNP power transistor collector. Internal equivalent circuit 2 1
1
PO1
2
PO2
3
GND
54
VCC
4
CS
5
REF
6 VCC
6
OUT
PNP power transistor control pin. Connects to PNP power transistor base. 7 CNT
7
8
VCC
+Power supply pin. Doubles as load detection pin. Connects load detection resistor to OUT pin and connects PNP power transistor emitter.
8
1.25V
MITSUMI
Secondary Control for Energy-saving AC Adaptors MM1529
Absolute Maximum Ratings
Item Storage temperature Operating temperature Supply voltage Power dissipation
(Ta=25C)
Symbol TSTG TOPR VCCmax. PD
Rating -40~+125 -30~+85 -0.3~+18 300 (Alone)
Unit C C V mW
Recommended Operating Conditions
Item Operating temperature Supply voltage Symbol TOPR VOP Rating -30~+85 +2.5~+12 Unit C V
Electrical Characteristics
Item Current consumption 1 (energy-saving mode)
(VCC=5.0V , Ta=25C Unless otherwise specified)
Symbol ICC1
Test Conditions VOUT=5.0V VREF=1.2V VCS=0V VOUT=4.7V
Min. Typ. Max. Unit 60 100 uA
Current consumption 2 (normal mode) Voltage control
ICC2
VREF=1.2V VCS=0V VOUT=5.0V RL1=500
1.7
3.5
mA
Output inversion voltage
VREFH
VREF:1.1V
H RL2=1k
1.225 1.250 1.275
V
VCS=0V RL3=100 VOUT=5.0V REF input current IREF VREF=1.2V VCS=0V VCC=4V 12V
Power supply voltage removal
15
100
nA
PSRR1
VREF=VREFH VCS=0V RL1=5k VOUT=5.0V
60
70
dB
P01 output inflow current
IPO1-V
VREF=1.5V VCS=0V VPO1=0.5V
5
17
mA
MITSUMI
Secondary Control for Energy-saving AC Adaptors MM1529
Item Rated current control
Symbol
Test Conditions VOUT=4.7V RL1=500
Min. Typ. Max. Unit
Output inversion voltage 1 (rated current control)
VCS1
VREF=1.2V VCS : L
RL2=1.2k
111.2 114.4 117.6 mV
H RL3=1.4k RL1=500
VCC=2.0V Output inversion voltage 2 (rated current control) VCS2 VOUT=0V VCS : L ICS VREF=1.2V RL2=1.2k H RL3=1.4k 15 100 nA VOUT=5.0V CS input current VREF=1.2V VCS=0.1V VCC=4V 12V
Power supply voltage removal
22
34
mV
PSRR2
VREF=1.2V VCS=VCS1-10mV RL2=5k VOUT=4.7V
60
70
dB
P01 output inflow current
IPO1-I
VREF=1.2V VCS=0.2V VPO1=0.5V
5
17
mA
Input/output error control RLS=4.7k Input/output error control voltage VLS RO=5k RLB=100 VOUT=4.7V CNT output inflow current ICNT VREF=1.2V VCS=0V VCNT=0.8V VOUT=5.0V OUT input current IOUT VREF=1.2V VCS=0V Load detection VOUT=5.0V Load detection voltage VLSP1 VREF=1.2V VOUT=L
Energy-saving detection voltage (load detection release voltage)
140
200
260
mV
5
30
mA
2
100
nA
L RL1=500 RL2=1k 170 200 230 mV
VCS=0V RL3=100 5.0V RL1=500 RL2=1k 97 115 133 mV VLSP2 VREF=1.2V
VCS=0V RL3=100 VOUT=5.0V RL1=500 VREFL VREF=1.2V L RL2=1k 0.975 1.000 1.025 V
Voltage drop detection
VCS=0V RL3=100 VOUT=4.7V PO2 output inflow current IPO2 VREF=1.2V VCS=0V VPO2=0.5V 5.0 9.0 mA
MITSUMI
Secondary Control for Energy-saving AC Adaptors MM1529
Operation Description
MM1529 Block Diagram
Vcc-OUT voltage 4.7k VCC RLS Supply transistor RLB Voltage drop detection Rated voltage control Input/output error control
Load connection detection
Load current OUT
ROS1 REF
Load
Rated current control
CS
ROS2 PO1 drive
RCS
PO2 drive
Load detection data transmission photocoupler PC2
Rated voltage rated current control photocoupler PC1
1. Description of Blocks
(1) Input/output error control Controls Tr base current supplied from the CNT pin when load is detected and the voltage between Vcc-OUT (supply Tr VCE voltage) falls below the setting voltage VLS (200mV). PO2 pin goes from OPEN to LOW when load current is the same as setting voltage VLSP1 (200mV) and photocoupler PC2 goes on. This releases AC adaptor primary side switching prohibition and supply status begins. Also,detection voltage is changed in load current increasing and decreasing directions. (hysteresis : VLSP1 = 200mV VLSP2 = 115mV) In order to carry out intermittent oscillation on the secondary side, in energy-saving mode (load 30A or less), the setting is such that energysaving detection is released when REF pin voltage = 1.0V or less (when output voltage reaches 4V when set at 5V). This causes secondary side output voltage to oscillate intermittently between 5V 4V. When voltage between CS and GND pins reaches setting voltage VCS1 (0.1144V), external rated current detection resistor RCS causes P01 pin to go from OPEN to LOW, and rated voltage rated current control photocoupler PC1 goes on. This starts CC mode and controls VCS1 voltage to 0.1144V. Controls P01 so that REF pin voltage = 1.25V. This starts CV mode.
(2) Load connection detection
(3) Voltage drop detection
(4) Rated current control
(5) Rated voltage control
MITSUMI
Secondary Control for Energy-saving AC Adaptors MM1529
2. Mode Settings
AC adaptors using MM1529 have the following four mode controls. Mode switching design is explained below.
(PO1:Control) (PO2:Open) Energy-saving mode
CV mode
(PO1:Control) (PO2:Low)
Output voltage (V)
VREFH
Energy-saving detection (load detection release)
Load Detection
CC mode (PO1:Control) (PO2:Low)
{1+(ROS1/ROS2)}
(PO1:Control) (PO2:Low)
Load current(A) ( VLSP2/RLS)-IOS* ( VLSP1/RLS)-IOS* VCS2/RCS VCS1/RCS *IOS=Output voltage/(ROS1+ROS2)
(1) Load detection/Energy-saving detection (RLS adjustment method)
Load detection current and energy-saving detection current can be set by load detection resistor RLS. When used at 4.7k, it is designed to switch when current flowing on RLS is > 43. However, R0S1 and R0S2 currents must be subtracted for actual detection. (Must be subtracted from Graph 1 results.) [Calculation formula] Load detection current = ( VLSP1/RLS) - (output voltage/(R0S1+/R0S2)) Energy-saving detection current = ( VLSP2/RLS) - (output voltage/(R0S1+/R0S2))
Relationship between RLS load detection value and energy-saving detection value
Energy-saving detection current(A)
1000
Load Detection Energy-saving detection
100
10 0.1 1 RLS load detection resistance (k) Graph 1 10
MITSUMI
Secondary Control for Energy-saving AC Adaptors MM1529
(2) Rated current detection (RCS adjustment method) Rated current control value can be set by rated current detection resistor RCS. When used at 0.22, it is designed to switch to rated current operation at 520mA. [Calculation formula] Rated current control = VCS1/RCS (VCS1 = 0.1144V)
Rated current detection current (mA)
10000
Relationship between rated current detection resistor RCS and detection value
1000
0.22
100 0.1 RCS rated current detection resistance () Graph 2 1.0
(3) Output voltage (R0S1, R0S2 adjustment method)
Precautions with regard to R0S1 and R0S2 output voltage detection resistance The REF pin is controlled to 1.25V, so output voltage can be designed using the resistance ratio between R0S1 and R0S2. At this time, R0S1 + R0S2 current is that added to load detection, so it must be set lower than load detection current. [Calculation formula] Output voltage = {1 + (R0S1/R0S2)} 1.25
R0S1 + R0S2 current value (uA)
100
Relationship between R0S1 and R0S2 output voltage detection resistance and current
10
5V Output 10V Output
1 100 ROS1 + ROS2 resistance value (k) Graph 3 1000
MITSUMI
Secondary Control for Energy-saving AC Adaptors MM1529
Load Detection
Load current increase
Load current
Load detection current=( VLSP1/RLS)-IOS 0mA Energy-saving detection current=( VLSP2/RLS)-IOS 5.2V VLSP1 (0.2V)
5V
Vcc pin Out pin
0V
OUT pin voltage
Vcc pin voltage
PO2 pin
OPEN
Low
CNT pin
OPEN
Control
Energy-saving Detection (load detection release)
Load current decrease
Load current
Detection current=( VLSP1/RLS)-IOS 0mA Energy-saving detection current=( 5.2V 5V VLSP2(0.1144V) VLSP2/RLS)-IOS
Vcc pin Out pin
0V
OUT pin voltage
Vcc pin voltage
PO2 pin
OPEN
Low
CNT pin
OPEN
Control
MITSUMI
Secondary Control for Energy-saving AC Adaptors MM1529
Application Circuit
F1 1.5A/125V
6.8 2200p R2 0.1 L1 R1 8.2 D1 680k 2.2M 270k
T1
C5 470
L2
C6 220
2.7k 240k R13 220 R15 Q4 100 R8
OUTPUT
AC100V SA1
22M
R3
D3
1M
R5
R4
D2 220
R7
DC4.9V 520mA R14 82k
MM1529
Q1 220 R11 0.22 C8
0.221%
Q2 0.1
Q3
470 R6 C11
4700 C4
0.047
R12 150p 220 R10 R9 1k C10
100k
PH1 R16
PH2
2200p
MITSUMI
Secondary Control for Energy-saving AC Adaptors MM1529
Characteristics Diagram
PO1 pin current characteristics
PO1 pin current IPO1(mA)
PO2 pin current characteristics
PO2 pin current IPO2(mA)
70 60 50 40 30 20 10 0
VCC=5V VCC=4V VCC=3V VCC=2V
VCC=1.8V
VCC=1.6V
70 60 50 40 30 20 10 0
VCC=5V VCC=4V VCC=3V VCC=2V
VCC=1.8V
VCC=1.6V
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
VPO1(V)
VPO2(V)
CNT pin current characteristics
CNT pin current ICNT(mA)
Reference voltage - current voltage characteristics
Reference voltage VREFH(V)
70 60 50 40 30 20 10 0
VCC=5V VCC=4V VCC=3V VCC=2.7V VCC=2.5V
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0
0
2
4
6
8
10 12 14 16 18 20
VCNT(V)
Current voltage Vcc(V)
Reference voltage temperature response (VCC=5V)
Reference voltage VREFH(V)
Current consumption 1 (energy-saving) temperature response (VCC=5V)
Current consumption 1(uA)
1.50 1.40 1.30 1.20 1.10 1.00 -50 -25 0 25 50 75 100
100 90 80 70 60 50 40 30 20 10 0 -50
-25
0
25
50
75
100
Temperature(C)
Temperature(C)
Current consumption 2 temperature response (VCC=5V)
Current consumption 2(uA)
2000 1800 1600 1400 1200 1000 800 600 400 200 0 -50
-25
0
25
50
75
100
Temperature(C)

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