MP4658
4-String, Max 200mA/Channel, 80V Return
LED Driver with AC/DC Feedback
DESCRIPTION
FEATURES
The MP4658 is a 4-string, secondary-side LED
driver for LED backlighting, and is ideal for
monitor and small-sized TV LED backlighting. It
controls the flyback power stage to regulate the
LED current loop and the output supply voltage.
The MP4658 integrates 4-string LED current
balancing. Powered by a 6V to 36V input supply
voltage (VIN), the MP4658 outputs a
compensation signal to control the primary-side
flyback (or other power stage) via an
optocoupler to regulate the output voltage
(VOUT).
•
•
•
6V to 36V Supply Voltage (VIN)
80V/200mA, 4-String LED Current Balance
Provides Feedback for the Previous Power
Stage
5kHz
>100Hz
MP4658 Rev. 1.0
10/13/2021
PDIM
FB
4 COMP2
16
ADIM
VIN
13
OVP
3
R5
7
8
6
9
OPT
FF
GND
NC
ADIM
LED3
1 PDIM
LED4
14
11
10
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1
MP4658 – 4-STRING, 80V RETURN LED DRIVER WITH AC/DC FEEDBACK
ORDERING INFORMATION
Part Number*
MP4658GS
Package
SOIC-16
Top Marking
See Below
MSL Rating
2
* For Tape & Reel, add suffix -Z (e.g. MP4658GS-Z).
TOP MARKING
MPS: MPS prefix
YY: Year code
WW: Week code
MP4658: Part number
LLLLLLLLL: Lot number
PACKAGE REFERENCE
TOP VIEW
MP4658
1
FF 16
PDIM
2 OPT
VIN
3 FB
NC
15
14
4 COMP2
ADIM 13
5 COMP1
ISET 12
11
6 OVP
LED3
7 LED1
LED4 10
8 LED2
GND
9
SOIC-16
MP4658 Rev. 1.0
10/13/2021
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2
MP4658 – 4-STRING, 80V RETURN LED DRIVER WITH AC/DC FEEDBACK
PIN FUNCTIONS
Pin #
Name
1
PDIM
2
OPT
3
FB
4
COMP2
5
COMP1
6
OVP
7
LED1
8
9
10
11
LED2
GND
LED4
LED3
12
ISET
13
ADIM
14
15
16
NC
VIN
FF
Description
PWM dimming input pin. Connect a pulse signal to implement pulse-width modulation
(PWM) dimming. When the PDIM pin’s voltage remains low for 30ms, the LED stage is
disabled and the IC enters constant voltage (CV) mode.
Optocoupler pin. This pin outputs the compensation signal for the primary-side flyback
power stage. Connect this pin to the external optocoupler to control the flyback.
System voltage feedback. Connect this pin to the system output through a voltage
divider.
Compensation pin. This pin compensates the output voltage (VOUT) loop and controls the
flyback power stage during the LED off period.
Compensation pin. This pin compensates the LED current loop and controls the flyback
power stage during the LED on period.
Over-voltage protection (OVP) pin. Connect this pin to the LED voltage (VLED) output
through a voltage divider.
Cathode of LED string 1.
Cathode of LED string 2.
Ground.
Cathode of LED string 4.
Cathode of LED string 3.
LED current set pin. This pin sets the LED current. Connect a resistor from this pin to the
ground to set the LED current (ILED).
Analog dimming input pin. Connect a >5kHz PWM signal to implement analog dimming.
The input impedance of this pin determines the internal filter constant, as well as the PWM
dimming rise and fall times. When the ADIM pin’s voltage remains low for 30ms, the LED
stage is disabled and the IC enters CV mode.
Not connected.
Input supply pin. This pin powers all internal logic circuitry.
Fault indicator pin. If a fault occurs, this pin is pulled low.
θJA
θJC
ABSOLUTE MAXIMUM RATINGS (1)
Thermal Resistance (4)
VIN .............................................. -0.3V to +38V
LEDx............................................ -0.3V to +80V
FF .............................................. -0.3V to +12V
Other pins ................................... -0.3V to +6.5V
Junction temperature ............................... 150°C
Lead temperature .................................... 260°C
Continuous power dissipation (TA = 25°C) (2)
................................................................ 1.56W
Storage temperature ................ -60°C to +150°C
SOIC-16 ................................. 80 ...... 35 ... °C/W
ESD Ratings
Human body model (HBM) .................... ±2000V
Charged device model (CDM)..................±750V
Notes:
1) Exceeding these ratings may damage the device.
2) The maximum allowable power dissipation is a function of the
maximum junction temperature TJ (MAX), the junction-toambient thermal resistance θJA, and the ambient temperature
TA. The maximum allowable continuous power dissipation at
any ambient temperature is calculated by PD (MAX) = (TJ
(MAX) - TA) / θJA. Exceeding the maximum allowable power
dissipation produces an excessive die temperature, causing
the regulator to go into thermal shutdown. Internal thermal
shutdown circuitry protects the device from permanent
damage.
3) The device is not guaranteed to function outside of its
operating conditions.
4) Measured on JESD51-7, 4-layer PCB.
Recommended Operating Conditions (3)
Supply voltage (VIN) ........................... 6V to 36V
Operating junction temp (TJ) .... -40°C to +125°C
MP4658 Rev. 1.0
10/13/2021
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3
MP4658 – 4-STRING, 80V RETURN LED DRIVER WITH AC/DC FEEDBACK
ELECTRICAL CHARACTERISTICS
VIN = 12V, TA = 25°C, unless otherwise noted.
Parameter
Symbol
Condition
Min
Typ
Max
Units
36
V
5.5
V
VIN Supply
VIN supply range
6
VIN_UVLO
VIN UVLO
VIN UVLO hysteresis
Quiescent current
Analog Dimming
ADIM logic high
ADIM logic low
ADIM/PWM pull-down resistor
Analog dimming input
frequency range
Duration to disable the ADIM
pin
ADIM pin input impedance for
slow soft PWM dimming (3ms)
ADIM pin input impedance for
fast soft PWM dimming (700µs)
PWM Dimming
PDIM logic high
PDIM logic low
PDIM pull-down resistor
PDIM input frequency range
Duration to disable the PDIM
pin
OPT
VIN_HYS_UVLO
IQ
500
1.5
1
5 (5)
tADIM_ST
100 (5)
25
50
kΩ
15
kΩ
0.4
1
100 (5)
Normal operation H
Normal operation L
IOPT
VFB_REF
RFB_DOWN
PWM off
1.182
75pF on COMP1
COMP1 open
Input common-mode range
Transconductance
GM_COMP1
PWM = high
For design
kHz
ms
1.5
tPDIM_ST
V
MΩ
30
VPDIM_HI
VPDIM_LO
RPDIM_DOWN
mA
V
0.4
RADIM_DOWN
GBCOMP1
AV_COMP1
VCM_COMP1
MP4658 Rev. 1.0
10/13/2021
mV
0.5
VFB over-voltage protection
VFB_OVP
(OVP)
System open feedback
VREF_OPEN
protection
Compensation Loop for LED (COMP1)
Gain bandwidth product
Open-loop DC gain
4.79
PWM = ADIM = 0
VADIM_HI
VADIM_LO
OPT pin output voltage range
OPT pin output voltage when
latched off
Source current capability
VFB
Reference voltage
FB pull-down resistor
4.5
V
V
MΩ
Hz
30
ms
2.3
0.8
V
V
3.3
V
20
mA
1.2
1
1.218
V
MΩ
1.24
VREF_VFB
500
mV
1 (5)
70 (5)
MHz
dB
-0.3 (5)
+4 (5)
720
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V
μA/V
4
MP4658 – 4-STRING, 80V RETURN LED DRIVER WITH AC/DC FEEDBACK
ELECTRICAL CHARACTERISTICS (continued)
VIN = 12V, TA = 25°C, unless otherwise noted.
Parameter
Symbol
Condition
Min
Typ
Max
Units
90
μA
Normal operation
1
V
High-level clamp voltage
VCOMP1_H
Compensation Loop for LED (COMP2)
Gain bandwidth product
GB_COMP2
Open-loop DC gain
AV_COMP2
Normal operation
2.5
V
75pF on COMP2
COMP2 open
1 (5)
70 (5)
MHz
dB
VCOMP2_L
Normal operation
1
V
2.5
V
260
μA/V
45
μA
Saturated output current
Low-level clamp voltage
Low-level clamp voltage
ISAT_COMP1
VCOMP1_L
High-level clamp voltage
VCOMP2_H Normal operation
Transconductance when
GM_COMP2 PWM off
PWM is off
Saturated output current
ISAT_COMP2
LED Driver Protection (OVP, LED Open/Short)
VTH_OVP
OVP threshold
OVP threshold hysteresis
OVP to latch IC threshold
LEDx threshold for open LED
OVP triggered
string mark-off
LEDx over-voltage (OV)
threshold (for LED short
VTH_LEDxOV
protection)
LED short delay time
tD_LEDxOV
Thermal protection threshold
Thermal protection
hysteresis
LED Current Regulation (VLEDx, ISET)
ISET voltage
VISET
RISET = 320kΩ (trim)
LEDx average current
ILED
RISET = 320kΩ (40%)
Current matching
ILED = 50mA
RISET = 320kΩ, ILED = 20mA
(40% of ADIM)
ILED = 200mA
Minimum LEDx regulation
VLEDx
voltage
ILED = 1mA
FF pin pull-down resistor
Open drain
2.4
V
200
3
mV
V
100
mV
5
V
5
150 (5)
ms
°C
25 (5)
°C
1.53
-1.5%
1.58
50
1.63
+1.5%
V
mA
-3%
20.3
0.3
+3%
2
mA
%
0.4
2.5
%
560
176
270
mV
mV
Ω
Note:
5) Guaranteed by design. Not tested in production.
MP4658 Rev. 1.0
10/13/2021
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5
MP4658 – 4-STRING, 80V RETURN LED DRIVER WITH AC/DC FEEDBACK
TYPICAL PERFORMANCE CHARACTERISTICS
Reference Voltage vs.
Temperature
VFB OVP vs. Temperature
1.49
1.205
1.485
VFB_OVP (V)
VFB_REF (V)
1.21
1.2
1.195
1.48
1.475
1.19
1.185
1.47
-50
0
50
100
TEMPERATURE (°C)
-50
VLED OVP Threshold vs.
Temperature
VIN Rising Voltage vs.
Temperature
VLED OVP THRESHOLD (V)
VIN RISING VOLTAGE (V)
4.75
4.73
4.71
4.69
4.67
4.65
-50
2.39
2.38
2.37
2.36
2.35
2.34
-50
0
50
100
TEMPERATURE ( C)
VFB Open Voltage vs.
Temperature
0
50
100
TEMPERATURE ( C)
ISET Voltage vs. Temperature
1.59
505
ISET VOLTAGE (V)
VFB OPEN VOLTAGE (mV)
0
50
100
TEMPERATURE ( C)
504
503
502
1.585
1.58
1.575
1.57
501
-50
MP4658 Rev. 1.0
10/13/2021
0
50
100
TEMPERATURE ( C)
-50
0
50
100
TEMPERATURE ( C)
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6
MP4658 – 4-STRING, 80V RETURN LED DRIVER WITH AC/DC FEEDBACK
QUIESCENT CURRENT (mA)
Quiescent Current vs.
Temperature
227
226
225
224
223
222
221
220
OPT LOW LEVEL VOLTAGE (V)
-50
0
50
100
TEMPERATURE ( C)
OPT HIGH LEVEL VOLTAGE (V)
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
OPT High-Level Voltage vs.
Temperature
2.264
2.262
2.26
2.258
2.256
2.254
2.252
2.25
2.248
2.246
2.244
2.242
-50
0
50
100
TEMPERATURE ( C)
OPT Low-Level Voltage vs.
Temperature
0.77
0.76
0.75
0.74
0.73
-50
MP4658 Rev. 1.0
10/13/2021
0
50
100
TEMPERATURE ( C)
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7
MP4658 – 4-STRING, 80V RETURN LED DRIVER WITH AC/DC FEEDBACK
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN_AC = 220VAC, VLED = 40V, ILED = 80mA/string, VSYS = 5V, ISYS = 3A, TA = 25°C, unless otherwise
noted.
Standby Mode
CV Mode
VSYS = 5V, ISYS = 0.1A
CH1: VOUT
CH1: VOUT
CH3: VSYS
CH3: VSYS
CH2: VSW
CH4: VLED
CH2: VSW
CH4: VLED
Power on in CV Mode
Power off in CV Mode
CH1: VOUT
CH1: VOUT
CH3: VLED
CH4: VSYS
CH3: VLED
CH4: VSYS
CH2: VSW
CH2: VSW
LED Enable
LED Disable
50% analog dimming
50% analog dimming
CH1: VOUT
CH1: VOUT
CH4: ILED
CH3: VLED
CH2: VSW
CH4: ILED
CH3: VLED
CH2: VSW
MP4658 Rev. 1.0
10/13/2021
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8
MP4658 – 4-STRING, 80V RETURN LED DRIVER WITH AC/DC FEEDBACK
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN_AC = 220VAC, VLED = 40V, ILED = 80mA/string, VSYS = 5V, ISYS = 3A, TA = 25°C, unless otherwise
noted.
Start-Up
Shutdown
CH1: VOUT
CH1: VOUT
CH3: VLED
CH4: ILED
CH3: VLED
CH4: ILED
CH2: VSW
CH2: VSW
LED On
LED On
100% dimming
50% dimming
CH1: VOUT
CH1: VOUT
CH2: VSW
CH2: VSW
CH4: ILED
CH3: VLED
CH3: VLED
CH4: ILED
One String Short
One String Open
CH1: VOUT
CH4: ILED
CH1: VOUT
CH3: VLED
CH4: ILED
CH2: FT
CH3: VLED
CH2: FT
MP4658 Rev. 1.0
10/13/2021
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MP4658 – 4-STRING, 80V RETURN LED DRIVER WITH AC/DC FEEDBACK
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN_AC = 220VAC, VLED = 40V, ILED = 80mA/string, VSYS = 5V, ISYS = 3A, TA = 25°C, unless otherwise
noted.
Load Transient
CH1: VOUT
CH4: ILED
CH2: VCOMP1
CH3: ISYS
MP4658 Rev. 1.0
10/13/2021
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MP4658 – 4-STRING, 80V RETURN LED DRIVER WITH AC/DC FEEDBACK
FUNCTIONAL BLOCK DIAGRAM
Delay
UVLO_VIN
2
Level Adjust
OPT
VCC
PWM
PWM_N
15
VIN
LDO
Fault
7
PWM
REF_LED
5
COMP1
Gm_I
S1
Min
Min LEDx
IREF
LED1
LED2
LED3
LED4
LED1
GM
.
.
.
.
.
.
4
COMP2
11
LED3
10
LED4
GM_V
S2
Fault
1.2 * VREF_VFB
OV_LED
3
LED2
EN_CHx
PWM_N
1.2V
8
2.4V
OVP
OV VSYS
6
OVP
FB
Fault Control
0.5V
12
ISET
10µs
Delay
Voltage
Adjustment
DC ADIM
Fault LED
3V
OVP
LED Protection
Management
5V
1
5ms
Delay
PWM
LEDx
PDIM
13
ADIM
Dimming
Control
100mV
DC ADIM
LEDx
Figure 1: Functional Block Diagram
MP4658 Rev. 1.0
10/13/2021
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11
MP4658 – 4-STRING, 80V RETURN LED DRIVER WITH AC/DC FEEDBACK
OPERATION
The MP4658 is a 4-string, secondary-side LED
driver for LED backlighting, and is ideal for
monitor and TV LED backlighting. It controls the
flyback power stage to regulate the LED current
(ILED) loop during the PWM on time and regulate
system supply voltage loop during the PWM off
time. Powered by a 6V to 36V input voltage
(VIN) supply, the MP4658 outputs a
compensation signal to control the primary-side
flyback (or other power stage) through an
optocoupler.
Start-Up
When the flyback is on, VIN is charged until it
reaches its UVLO threshold, at which point the
system logic starts to work.
LED Current and Voltage Regulation
The MP4658 accurately regulates the ILED loop
or the output voltage (VOUT) with a single flyback
power stage.
When pulse-width modulation (PWM) dimming
is on, the MP4658 regulates ILED through the
flyback power stage control (see Figure 2).
FB
1.2V
Min LEDx
Ref
EA_V
COMP2
EA_I
DC/DC
Flyback
Control
Total
Power
LED Stage
COMP1
Min VLEDx
Figure 2: MP4658 Control Scheme when PWM
Dimming Is On
When PWM dimming is off, the LED stage is
disabled and the MP4658 regulates the output
voltage (VOUT) using the feedback (FB) voltage
(VFB) from the FB pin (see Figure 3).
FB
1.2V
Min LEDx
Ref
EA_V
COMP2
Flyback
Control
EA_I
Total
Power
VOUT
DC/DC
VSYS
COMP1
Figure 3: MP4658 Control Scheme when PWM
Dimming Is Off
LED Current Regulation when PWM
Dimming Is On
For the ILED regulation loop, the minimum LEDx
voltage (VLEDx) is fed back and compared to the
internal reference voltage. This reference
changes with the ILED setting. The internal error
amplifier (EA) regulates the average minimum
MP4658 Rev. 1.0
10/13/2021
VLEDx to the internal reference voltage. The EA’s
output is connected to the external current-loop
compensation network on the COMP1 pin
through an inner switch (S1). During the PWM
on time, S1 is on and the minimum VLEDx is
regulated by this control loop. The flyback
power is set by the COMP1 voltage (VCOMP1).
During the PWM off period, S1 is turned off, the
compensation network is disconnected from the
EA’s output, and VCOMP1 remains steady until
the next PWM on interval. The EA’s output is
also pulled low during the PWM off period.
Output Voltage Regulation when PWM
Dimming Is Off
When PWM dimming is off, the output voltage
(VOUT) is fed back to the FB pin and the internal
VREF is equal to 1.2V. During the PWM off
period, the MP4658 regulates VOUT by
controlling the flyback power stage. The internal
voltage-loop EA regulates the average VFB to its
internal reference. The EA’s output is
connected to the external voltage-loop
compensation network on the COMP2 pin. The
flyback power is set by the COMP2 voltage
(VCOMP2).
When PWM dimming is on, the flyback power is
controlled by VCOMP1 and VOUT varies with
different dimming conditions. The voltage-loop
EA’s output is also pulled low.
Dimming Control
The MP4658 provides analog dimming and
PWM dimming for ILED through the separate
ADIM and PDIM pin. For analog dimming, apply
a pulse signal with a frequency above 5kHz to
the ADIM pin and pull the PDIM pin high. The
pulse signal’s duty cycle sets the ILED amplitude.
For PWM dimming, the duty cycle of input
signal at the ADIM pin sets the peak ILED value.
ILED is chopped by the input PWM signal at the
PDIM pin. The brightness of the LED string is
proportional to the external PWM signal’s duty
cycle, which helps achieve fast and highcontrast ratio PWM dimming. For analog PWM
dimming, apply a 5kHz
ADIM
>100Hz
PDIM
13
ADIM
LED3
1 PDIM
LED4
11
10
Figure 5: MP4658 Typical Application Circuit (Flyback 4-String LED Driver)
MP4658 Rev. 1.0
10/13/2021
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16
MP4658 – 4-STRING, 80V RETURN LED DRIVER WITH AC/DC FEEDBACK
PACKAGE INFORMATION
SOIC-16
MP4658 Rev. 1.0
10/13/2021
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MP4658 – 4-STRING, 80V RETURN LED DRIVER WITH AC/DC FEEDBACK
CARRIER INFORMATION
Pin1
1
1
1
1
ABCD
ABCD
ABCD
ABCD
Feed Direction
Part Number
MP4658GS-Z
MP4658 Rev. 1.0
10/13/2021
Package
Description
SOIC-16
Quantity/
Reel
2500
Quantity/
Tube
50
Quantity/
Tray
N/A
Reel
Diameter
13in
Carrier
Tape Width
16mm
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Carrier
Tape Pitch
8mm
18
MP4658 – 4-STRING, 80V RETURN LED DRIVER WITH AC/DC FEEDBACK
REVISION HISTORY
Revision #
Revision Date
1.0
10/13/2021
Description
Pages Updated
Initial Release
-
Notice: The information in this document is subject to change without notice. Please contact MPS for current specifications.
Users should warrant and guarantee that third-party Intellectual Property rights are not infringed upon when integrating MPS
products into any application. MPS will not assume any legal responsibility for any said applications.
MP4658 Rev. 1.0
10/13/2021
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