AEROSEMI
FEATURES
MT6511 High Precision CC/CV
Primary-Side Conteoller
GENERAL DESCRIPTION
MT6511 is a high performance offline PWM Power
switch for low power AC/DC charger and adapter
applications. It operates in primary-side sensing and
regulation. Consequently, opto-coupler and TL431
could be eliminated. Proprietary Constant Voltage (CV)
and Constant Current (CC) control is integrated as
shown in the figure below.
In CC control, the current and output power setting can
be adjusted externally by the sense resistor Rs at ISEN
pin. In CV control, multi-mode operations are utilized to
achieve high performance and high efficiency.
Inaddition, good load regulation is achieved by the
built-in cable drop compensation. Device operates in
PFM in CC mode as well at large load condition and it
operates in PWM with frequency reduction at
light/medium load.
MT6511 offers power on soft start control and
protection coverage with auto-recovery features
including Cycle-by-Cycle current limiting, VIN OVP,
VIN clamp and UVLO. Excellent EMI performance is
achieved with frequency shuffling technique.
High precision constant voltage (CV) and constant
current (CC) can be achieved by MT6511.
5% Constant Voltage Regulation, 5% Constant
Current Regulation at Universal AC input
Primary-side Sensing and Regulation Without
TL431 and Opto-coupler
Programmable CV and CC Regulation
Adjustable Constant Current and Output Power
Setting
Built-in Secondary Constant Current Control with
Primary Side Feedback
Built-in Adaptive Current Peak Regulation
Built-in Primary winding inductance compensation
Programmable Cable drop Compensation
Power on Soft-start
Built-in Leading Edge Blanking (LEB)
Cycle-by-Cycle Current Limiting
VIN Under Voltage Lockout with Hysteresis(UVLO)
VIN OVP
VIN Clamp
APPLICATIONS
Low
Power AC/DC offline SMPS for
Cell Phone Charger
Digital Cameras Charger
Small Power Adapter
Auxiliary Power for PC, TV etc.
Linear Regulator/RCC Replacement
Fig.1. Typical CC/CV Curve
MT6511 V1.1
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GENERAL INFORMATION
Pin Configuration
The pin map is shown as below for SOT23-6
MT6511 High Precision CC/CV Primary-Side Controller
Package Dissipation Rating
Package
RθJA (℃/W)
SOT23-6
200
NOTE:
Drain Pin Connected 100mm
2
PCB
copper clad.
Parameter
Drain Voltage (off state)
VIN Zener Clamp
Continuous Current
COMP Voltage
ISEN Input Voltage
ZCS Input Voltage
Min/Max Operating
Junction Temperature T
J
Min/Max Storage
Temperature T
stg
Lead Temperature
(Soldering,10secs)
Value
-0.3V to Bvdss
10 mA
-0.3 to 7V
-0.3 to 7V
-0.3 to 7V
-20 to 150
º
C
-55 to 150
º
C
260
º
C
Ordering Information
Part Number
MT6511CP
MT6511CPA
Description
SOT23-6,Pb-free,Tube
SOT23-6,Pb-free,T&R
Note:
Stresses beyond those listed under “absolute
maximum ratings” may cause permanent damage to the
device. These are stress ratings only, 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-rated conditions for
extended periods may affect device reliability.
TERMINAL ASSIGNMENTS
Pin Num Pin Name
GND
1
2
GATE
3
ISEN
4
5
6
ZCS
COMP
VIN
I/O
P
O
I
I
I
P
Description
Ground
Gate driver output for power MOSFET
Current Sense
The voltage feedback from auxiliary winding. Connected to resistor
divider From auxiliary winding reflecting output voltage. PWM duty
cycle is determined by EA output and current sense signal at pin4.
Loop Compensation for CV Stability
Power Supply
MT6511 V1.1
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ELECTRICAL CHARACTERISTICS
Symbol
Parameter
MT6511 High Precision CC/CV Primary-Side Controller
(T
A
= 25
O
C, VIN=16V, if not otherwise noted)
Test Conditions
Min
Typ
Max
Unit
Supply Voltage(VIN) Section
I
DD ST
I
DD_op
Stand by Current
Operation Current
VIN Under Voltage
VIN Under Voltage
Lockout Exit
VIN=13V
Operation supply current
ZCS=2V,ISEN=0V,VIN=20V
5
-
8
13.5
26
2
9
14.8
27.5
20
3
10
16.0
29
uA
mA
V
V
V
UVLO(OFF)
Lock out Enter
UVLO(ON)
OVP
VIN falling
VIN rising
Ramp VIN until gate shutdown
Over voltage protection
Threshold
LEB time
Over current threshold
OCP Propagation delay
Input Impedance
Soft start time
Current Sense Input Section
TLEB
Vth_oc
Td_oc
ZSENSE_IN
T_ss
625
880
50
17
55
60
50
ZCS=0V,Comp=5V
Frequency shuffling range
14
±4
1.97
2
60
ZCS=2V,Comp=0V
37.5
2.03
65
910
150
940
ns
mV
ns
Kohm
ms
KHz
KHz
KHz
%
Frequency Section
Freq_Max
Note1
IC Maximum frequency
Freq_Nom
Freq_startup
△f/Freq
Error Amplifier section
Vref_EA
Gain
I_
COMP_MAX
Reference voltage for EA
DC gain of EA
Max. Cable compensation current
V
dB
uA
System Nominal switch
frequency
Power MOSFET Section
V_clamp
Tr
Output clamp voltage
Output rising time
16
CL=0.5nF
650
V
ns
ns
CL=0.5nF
40
Output falling time
Tf
Note:
1. Freq_Max indicates IC internal maximum clock frequency. In system application, the
maximum operation frequency of 60Khz nominal occurs at maximum output power or the
transition point from CV to CC.
MT6511 V1.1
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