SGM3750 [SGMICRO]
White LED Driver with PWM Dimming Control;
| 型号： | SGM3750 |
| 厂家： | 
Shengbang Microelectronics Co, Ltd |
| 描述： | White LED Driver with PWM Dimming Control |
| 文件： | 总12页 (文件大小：676K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SGM3750
White LED Driver
with PWM Dimming Control
GENERAL DESCRIPTION
FEATURES
The SGM3750 is a high efficiency white LED driver with
a 650kHz boost converter. With the fixed switching
frequency and an internal 40V switch FET, the
SGM3750 can use small components. The driver also
achieves improved efficiency and reduced output ripple.
● Input Voltage Range: 2.7V to 20V
● Up to 90% Efficiency
● Switching Frequency: 650kHz
● Feedback Voltage: 200mV
● PWM Dimming Control
The SGM3750 is capable of driving 10 white LEDs in
series. The FB feedback voltage is regulated at 200mV
typically. The default LED current is programmed by an
external RSET resistor. During the operation, the LED
current can be controlled by applying a PWM signal to
the CTRL pin. The feedback voltage depends on the
PWM signal duty cycle. For PWM dimming control,
there are no audible noises on the output capacitor.
● PWM Dimming Frequency: 5kHz to 100kHz
● 38V LED Open Protection
● 600kΩ Pull-Down Resistor on CTRL Pin
● Automatic Soft-Start for Reducing Inrush Current
● Dimming Stable in More than 1:500 PWM Range
● -40℃ to +85℃ Operating Temperature Range
● Available in Green TDFN-2×2-6L and TSOT-23-6
Packages
The SGM3750 integrates LED open protection. It
prevents the device from damaging due to the over-
voltage during LED open conditions..
APPLICATIONS
Mobile Phones
The SGM3750 is available in Green TDFN-2×2-6L and
TSOT-23-6 packages. It operates over an ambient
temperature range of -40℃ to +85℃.
Portable Media Players
GPS Receivers
Backlight for Media Form Factor Display
TYPICAL APPLICATION
L
22μH
D1
38V MAX
VIN
2.7V to 20V
VIN
SW
C1
1μF
CIN
22μF
SGM3750
10S1P
COMP
GND
CCOMP
47nF
20mA
Enable and
PWM Dimming Control
CTRL
FB
RSET
10Ω
Figure 1. Typical Application Circuit
SG Micro Corp
www.sg-micro.com
JULY 2016 – REV. A. 2
SGM3750
White LED Driver with PWM Dimming Control
PACKAGE/ORDERING INFORMATION
SPECIFIED
TEMPERATURE
RANGE
PACKAGE
DESCRIPTION
ORDERING
NUMBER
PACKAGE
MARKING
PACKING
OPTION
MODEL
3750
-40℃ to +85℃
-40℃ to +85℃
TDFN-2×2-6L
TSOT-23-6
SGM3750YTDI6G/TR
SGM3750YTN6G/TR
Tape and Reel, 3000
Tape and Reel, 3000
XXXX
SGM3750
SVEXX
MARKING INFORMATION
NOTE: XX = Date Code.
YYY X X
Date Code - Week
Date Code - Year
Serial Number
Green (RoHS & HSF): SG Micro Corp defines "Green" to mean Pb-Free (RoHS compatible) and free of halogen substances. If
you have additional comments or questions, please contact your SGMICRO representative directly.
OVERSTRESS CAUTION
ABSOLUTE MAXIMUM RATINGS
Stresses beyond those listed in Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to
absolute maximum rating conditions for extended periods
may affect reliability. Functional operation of the device at any
conditions beyond those indicated in the Recommended
Operating Conditions section is not implied.
Supply Voltage on VIN....................................... -0.3V to 22V
Voltage on CTRL ................................................. -0.3V to 6V
Voltages on FB and COMP.................................. -0.3V to 3V
Voltage on SW................................................... -0.3V to 40V
Package Thermal Resistance
TDFN-2×2-6L, θJA.................................................... 120℃/W
TSOT-23-6, θJA ........................................................ 190℃/W
Junction Temperature.................................................+150℃
Storage Temperature Range........................-65℃ to +150℃
Lead Temperature (Soldering, 10sec) ........................+260℃
ESD Susceptibility
ESD SENSITIVITY CAUTION
This integrated circuit can be damaged if ESD protections are
not considered carefully. SGMICRO recommends that all
integrated circuits be handled with appropriate precautions.
Failureto observe proper handlingand installation procedures
can cause damage. ESD damage can range from subtle
performance degradation tocomplete device failure. Precision
integrated circuits may be more susceptible to damage
because even small parametric changes could cause the
device not to meet the published specifications.
HBM.............................................................................4000V
MM.................................................................................300V
RECOMMENDED OPERATING CONDITIONS
Input Voltage Range............................................2.7V to 20V
Operating Temperature Range.......................-40℃ to +85℃
DISCLAIMER
SG Micro Corp reserves the right to make any change in
circuit design, or specifications without prior notice.
SG Micro Corp
www.sg-micro.com
JULY 2016
2
SGM3750
White LED Driver with PWM Dimming Control
PIN CONFIGURATIONS
(TOP VIEW)
(TOP VIEW)
1
2
6
5
VIN
FB
FB
COMP
GND
VIN
1
2
3
6
5
4
COMP
CTRL
CTRL
SW
GND
3
4
SW
GND
TDFN-2×2-6L
TSOT-23-6
PIN DESCRIPTION
PIN
NAME I/O
FUNCTION
TSOT-23-6 TDFN-2×2-6L
1
2
6
5
VIN
I
I
Input Supply Pin.
Boost Regulator Control Pin. It is used for enable control and PWM dimming
control.
CTRL
Boost Switching Node. The device monitors the output voltage on this pin for
LED open protection. Connect an inductor between the VIN and SW pins
3
4
4
3
2
1
SW
GND
COMP
FB
I
O
O
I
Ground Pin.
Transconductance Error Amplifier Output. Connect an external capacitor from
COMP to GND to compensate the converter.
5
6
Feedback Input for Current. Connect the sense resistor from FB to GND.
Exposed
Pad
Exposed Pad. It should be soldered to the analog ground plane. If possible,
use thermal via connection to ground plane for enhanced power dissipation.
―
GND
―
SG Micro Corp
www.sg-micro.com
JULY 2016
3
SGM3750
White LED Driver with PWM Dimming Control
ELECTRICAL CHARACTERISTICS
(VIN = 3.6V, VCTRL = VIN, CIN = 22μF, Full = -40℃ to +85℃, typical values are at TA = +25℃, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
TEMP
MIN
TYP
MAX
UNITS
Power Supply
Input Voltage Range
VIN
IQ
2.7
20
0.6
1
V
+25℃
+25℃
+25℃
+25℃
+25℃
Operating Quiescent Current into VIN
Shutdown Current
VFB = 400mV
0.4
mA
μA
V
ISD
VCTRL = GND, VIN = 4.2V
VIN falling
Under-Voltage Lockout Threshold
Under-Voltage Lockout Hysterisis
Enable and Reference Control
CTRL Logic High Voltage
CTRL Logic Low Voltage
CTRL Pull-Down Resistor
CTRL Pulse Width to Shutdown
Power Switch
UVLO
VHYS
2.2
70
2.5
mV
VCTRLH
VCTRLL
RCTRL
tOFF
VIN = 2.7V to 20V
VIN = 2.7V to 20V
Full
Full
1.5
V
V
0.35
800
400
2.5
600
0.3
kΩ
ms
+25℃
+25℃
CTRL high to low
VIN = 3.6V
0.55
0.6
1
+25℃
+25℃
+25℃
N-Channel MOSFET On-Resistance
RDS(ON)
ILN_NFET
Ω
VIN = 3.0V
N-Channel Leakage Current
μA
VSW = 35V, TA = 25℃
Voltage and Current Control
Voltage Feedback Regulation Voltage
VREF
VIN = 3.6V
196
48
200
50.5
20.5
2.5
204.5
53.5
22.5
3.3
mV
mV
+25℃
+25℃
+25℃
+25℃
+25℃
Full
VIN = 3.6V, fPWM =10kHz, duty cycle = 25%
VIN = 3.6V, fPWM =10kHz, duty cycle = 10%
VIN = 3.6V, fPWM =10kHz, duty cycle = 1%
VIN = 3.6V, fPWM =10kHz, duty cycle = 0.2%
VFB = 200mV
19
Voltage Feedback Regulation Voltage
Under Brightness Control
VREF_PWM
1.7
1.25
0.001
650
80
Voltage Feedback Input Bias Current
Oscillator Frequency
IFB
fS
tMIN_ON
ISINK
ISOURCE
GEA
0.2
μA
kHz
ns
Full
500
800
Minimum ON Pulse Width
COMP Pin Sink Current
+25℃
+25℃
+25℃
Full
40
μA
COMP Pin Source Current
Error Amplifier Transconductance
20
μA
160
280
400
µmho
Over-Current and Open Led Protection
N-Channel MOSFET Current Limit
Open LED Protection Threshold
VREF Filter Time Constant
ILIM
VOVP
tREF
0.65
35.5
0.95
38
1.3
A
V
+25℃
Full
Measured on the SW pin
39.5
130
μs
+25℃
Pwm Brightness Control
PWM Dimming Frequency
Minimum PWM On-Time
fPWM
Full
5
100
kHz
ns
30
0.2
+25℃
+25℃
Minimum Stable Duty Cycle
Thermal Shutdown
DMIN
%
Thermal Shutdown Threshold
TSHDN
THYS
150
15
℃
℃
Thermal Shutdown Threshold
Hysteresis
SG Micro Corp
www.sg-micro.com
JULY 2016
4
SGM3750
White LED Driver with PWM Dimming Control
RECOMMENDED COMPONENTS OF TEST CIRCUITS
COMPONENT
COMPONENT
22μH/CD75NP-220KC
10μH/CD75NP-100KC
MBR0540
22μF/C2012X7R1H226KT
1μF/C2012X7R1H105KT
INDUCTOR
DIODE
CAPACITOR
47nF/C0603X7S0J473M030BB
TYPICAL PERFORMANCE CHARACTERISTICS
Open LED Protection
Output Ripple at PWM Dimming
VFB
PWM
AC Coupled
VOUT
VOUT
ILED
IL
VIN = 3.6V, ILED = 20mA, L = 22μH
VIN = 3.6V, ILED = 20mA, L = 22μH, 8LEDs
Time (200μs/div)
f
PWM = 10kHz, 8LEDs
Time (100μs/div)
Switching Waveform
Start-Up
VCTRL
VSW
AC Coupled
VOUT
VOUT
VCOMP
IL
IL
VIN = 3.6V, ILED = 20mA, L = 22μH, 8LEDs
Time (2μs/div)
VIN = 3.6V, ILED = 20mA, L = 22μH, 8LEDs
Time (2ms/div)
SG Micro Corp
www.sg-micro.com
JULY 2016
5
SGM3750
White LED Driver with PWM Dimming Control
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
Feedback Voltage vs. PWM Duty Cycle
VIN = 3.6V
Feedback Voltage vs. PWM Duty Cycle
VIN = 3.6V
1000
100
10
200
160
120
80
fPWM = 40kHz
fPWM = 40kHz
fPWM = 20kHz
1
40
fPWM = 20kHz
0.1
0
0.1
1
10
100
0
20
40
60
80
100
PWM Duty Cycle (%)
PWM Duty Cycle (%)
Efficiency vs. Output Current
Efficiency vs. Output Current
100
80
60
40
20
0
100
80
60
40
20
0
2 × 8LEDs
VIN = 12V
VIN = 3.6V
2 × 6LEDs
VIN = 5V
2 × 4LEDs
VIN = 3.6V, L = 22μH
2 × 10LEDs, L = 22μH
0
10
20
30
40
50
0
10
20
30
40
50
Output Current (mA)
Output Current (mA)
Feedback Voltage Production Distribution
100 Samples
1 Production Lot
DPWM = 10%
DPWM = 100%
50
45
40
35
30
25
20
15
10
5
DPWM = 25%
DPWM = 1%
DPWM = 0.2%
0
Normalized Feedback Voltage
SG Micro Corp
www.sg-micro.com
JULY 2016
6
SGM3750
White LED Driver with PWM Dimming Control
ADDITIONAL TYPICAL APPLICATIONS
L
10μH
D1
VIN
2.7V to 5V
VIN
SW
C1
0.47μF
CIN
22μF
SGM3750
COMP
GND
CCOMP
47nF
20mA
Enable and
PWM Dimming Control
CTRL
FB
RSET
10Ω
Figure 2. Li-Ion Driver for 6 White LEDs
L
22μH
D1
VIN
2.7V to 5V
VIN
SW
C1
1μF
CIN
22μF
SGM3750
COMP
GND
CCOMP
47nF
20mA
Enable and
PWM Dimming Control
CTRL
FB
RSET
10Ω
Figure 3. Li-Ion Driver for 8 White LEDs
SG Micro Corp
www.sg-micro.com
JULY 2016
7
SGM3750
White LED Driver with PWM Dimming Control
REVISION HISTORY
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
JULY 2016 ‒ REV.A.1 to REV.A.2
Changed Features item from: PWM Dimming Stable in 1:500 Range to: Dimming Stable in More than 1:500 PWM Range ................................1
Changed Minimum PWM On-Time parameter .....................................................................................................................................................4
Changed capacitor selection................................................................................................................................................................................5
Changed Equation 2............................................................................................................................................................................................9
Changed Package Outline Dimensions section ........................................................................................................................................... 15, 16
JUNE 2015 ‒ REV.A to REV.A.1
Added the graph of Feedback Voltage Production Distribution ............................................................................................................................6
Changes from Original (APRIL 2015) to REV.A
Changed from product preview to production data.............................................................................................................................................All
SG Micro Corp
www.sg-micro.com
JULY 2016
8
PACKAGE INFORMATION
PACKAGE OUTLINE DIMENSIONS
TDFN-2×2-6L
D
e
N6
D1
L
E1
E
SEE DETAIL A
k
N3
N1
b
BOTTOM VIEW
TOP VIEW
1.40
0.65
A
A1
0.80
2.60
A2
SIDE VIEW
0.24
0.65
N2
N1
N2
N1
RECOMMENDED LAND PATTERN (Unit: mm)
DETAIL A
Pin #1 ID and Tie Bar Mark Options
NOTE: The configuration of the Pin #1 identifier is optional,
but must be located within the zone indicated.
Dimensions
In Millimeters
Dimensions
In Inches
Symbol
MIN
MAX
0.800
0.050
MIN
0.028
0.000
MAX
0.031
0.002
A
A1
A2
D
0.700
0.000
0.203 REF
0.008 REF
1.900
1.100
1.900
0.600
2.100
1.450
2.100
0.850
0.075
0.043
0.075
0.024
0.083
0.057
0.083
0.034
D1
E
E1
k
0.200 MIN
0.650 TYP
0.008 MIN
0.026 TYP
b
0.180
0.250
0.300
0.450
0.007
0.010
0.012
0.018
e
L
SG Micro Corp
www.sg-micro.com
TX00055.001
PACKAGE INFORMATION
PACKAGE OUTLINE DIMENSIONS
TSOT-23-6
0.69
0.95
D
e
2.59
E1
E
0.99
b
RECOMMENDED LAND PATTERN (Unit: mm)
L
A
θ
0.25
A1
c
A2
Dimensions
In Millimeters
Dimensions
In Inches
Symbol
MIN
MAX
MIN
MAX
0.043
0.004
0.039
0.020
0.008
0.116
0.065
0.116
A
A1
A2
b
1.000
0.100
0.900
0.500
0.200
2.950
1.650
2.950
0.000
0.700
0.300
0.080
2.850
1.550
2.650
0.000
0.028
0.012
0.003
0.112
0.061
0.104
c
D
E
E1
e
0.950 BSC
0.037 BSC
L
0.300
0°
0.600
8°
0.012
0°
0.024
8°
θ
SG Micro Corp
www.sg-micro.com
TX00038.001
PACKAGE INFORMATION
TAPE AND REEL INFORMATION
REEL DIMENSIONS
TAPE DIMENSIONS
P2
P0
W
Q2
Q4
Q2
Q4
Q2
Q4
Q1
Q3
Q1
Q3
Q1
Q3
B0
Reel Diameter
P1
A0
K0
Reel Width (W1)
DIRECTION OF FEED
NOTE: The picture is only for reference. Please make the object as the standard.
KEY PARAMETER LIST OF TAPE AND REEL
Reel Width
Reel
Diameter
A0
B0
K0
P0
P1
P2
W
Pin1
Package Type
W1
(mm)
(mm) (mm) (mm) (mm) (mm) (mm) (mm) Quadrant
TDFN-2×2-6L
TSOT-23-6
7″
7″
9.5
9.5
2.30
3.20
2.30
3.10
1.10
1.10
4.0
4.0
4.0
4.0
2.0
2.0
8.0
8.0
Q1
Q3
SG Micro Corp
TX10000.000
www.sg-micro.com
PACKAGE INFORMATION
CARTON BOX DIMENSIONS
NOTE: The picture is only for reference. Please make the object as the standard.
KEY PARAMETER LIST OF CARTON BOX
Length
(mm)
Width
(mm)
Height
(mm)
Reel Type
Pizza/Carton
7″ (Option)
7″
368
442
227
410
224
224
8
18
SG Micro Corp
www.sg-micro.com
TX20000.000
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