SGM3736YTDE8G/TR-V1 [SGMICRO]
PWM Dimming, 38V Step-Up LED Driver;
| 型号： | SGM3736YTDE8G/TR-V1 |
| 厂家： | 
Shengbang Microelectronics Co, Ltd |
| 描述： | PWM Dimming, 38V Step-Up LED Driver |
| 文件： | 总11页 (文件大小：691K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SGM3736
PWM Dimming, 38V Step-Up LED Driver
GENERAL DESCRIPTION
FEATURES
The SGM3736 is a versatile constant current LED
driver with high efficiency step-up converter
● Wide Output Range: Up to 10 Series LEDs
● Integrated 40V High Current Switch (1.35A Limit)
● 2.7V to 5.5V Input Voltage Range
● High Efficiency PWM Converter
a
architecture. The low-side power MOSFET is
integrated in the device, significantly shrinking the
overall PCB layout area and minimizing the total
number of external components. Unique technology
and high 1.35A current limit allow SGM3736 to drive up
to 38V output (10 LEDs in series). Alternatively,
SGM3736 can deliver 260mA total current with 3 series
LEDs per string. It can also maximize the current
capability while achieving high conversion efficiency.
The optimized 1.1MHz switching frequency results in
reduced conduction loss and small external component
size. Digital PWM dimming interface is integrated to
adjust LED current. The PWM frequency is in the range
from 2kHz to 60kHz.
● Low 200mV Feedback Voltage
● 500kΩ Pull-Down Resistor on EN/PWM Pin
● 2kHz to 60kHz PWM Dimming Frequency
● 38V Open LED Protection
● 1.1MHz Switching Frequency
● Integrated Soft-Start Function
● Less than 1µA Shutdown Current
● Simple, Small Solution Size
● Available in Green TDFN-2×2-8L Package
● -40℃ to +85℃ Operating Temperature Range
APPLICATIONS
Various protection features are built into the SGM3736,
including cycle-by-cycle input current limit protection,
open LED (output over-voltage) protection and thermal
shutdown protection. The leakage current in shutdown
mode is less than 1µA.
LED Backlighting
Mobile Phones
Handheld Devices
Digital Photo Frames
Automotive Navigation
The SGM3736 is available in Green TDFN-2×2-8L
package. It operates over an ambient temperature
range of -40℃ to +85℃.
REV. A. 3
SG Micro Corp
www.sg-micro.com
SGM3736
PWM Dimming, 38V Step-Up LED Driver
PACKAGE/ORDERING INFORMATION
SPECIFIED
TEMPERATURE
RANGE
PACKAGE
DESCRIPTION
ORDERING
NUMBER
PACKAGE
MARKING
PACKING
OPTION
MODEL
3736
XXXX
SGM3736
TDFN-2×2-8L
SGM3736YTDE8G/TR-V1
Tape and Reel, 3000
-40℃ to +85℃
NOTE: XXXX = Date Code.
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.
ABSOLUTE MAXIMUM RATINGS
OVERSTRESS CAUTION
Input Voltage, VIN................................................. -0.3V to 6V
High Voltage Nodes, SW, VOUT ....................... -0.3V to 40V
Other Pins, FB, EN/PWM..........................-0.3V to VIN + 0.3V
Package Thermal Resistance
Stresses beyond those listed may cause permanent damage
to the device. Functional operation of the device at these or
any other conditions beyond those indicated in the
operational section of the specification is not implied.
Exposure to absolute maximum rating conditions for
extended periods may affect reliability.
TDFN-2×2-8L, θJA ...................................................... 75℃/W
Junction Temperature...................................................150℃
Storage Temperature Range ........................-65℃ to +150℃
Lead Temperature (Soldering, 10sec) ..........................260℃
ESD SENSITIVITY CAUTION
This integrated circuit can be damaged by ESD if you don’t
pay attention to ESD protection. SGMICRO recommends that
all integrated circuits be handled with appropriate precautions.
Failure to observe proper handling and installation
procedures can cause damage. ESD damage can range from
subtle performance degradation to complete device failure.
Precision integrated circuits may be more susceptible to
damage because very small parametric changes could cause
the device not to meet its published specifications.
ESD Susceptibility
HBM.............................................................................3000V
MM.................................................................................200V
RECOMMENDED OPERATING CONDITIONS
Input Voltage Range...........................................2.7V to 5.5V
Operating Temperature Range.......................-40℃ to +85℃
DISCLAIMER
SG Micro Corp reserves the right to make any change in
circuit design, specification or other related things if
necessary without notice at any time.
SG Micro Corp
www.sg-micro.com
2
SGM3736
PWM Dimming, 38V Step-Up LED Driver
PIN CONFIGURATION
(TOP VIEW)
PGND
VIN
1
2
3
4
8
7
6
5
SW
VOUT
FB
EN/PWM
GND
RSET
TDFN-2×2-8L
PIN DESCRIPTION
PIN
1
NAME
PGND
VIN
FUNCTION
Power Ground.
Supply Input.
2
Enable Control and PWM Dimming Input. It is a multi-functional pin which can be used for
enable control and digital PWM dimming.
3
4
EN/PWM
GND
Ground.
RSET Pin. Connect one resistor from RSET pin to GND to program the maximum white
LED current.
5
6
7
8
RSET
FB
Feedback Input. Connect this pin to the cathode of the white LED.
Output and Over-Voltage Protection Pin.
VOUT
SW
Switch Output. Connect this pin to the inductor and the Schottky diode.
Exposed
Pad
GND
Exposed pad should be soldered to PCB board and connected to GND.
TYPICAL APPLICATION
Up to 38V Output
White LEDs
Input Range
2.7V~5.5V
L
D1
CIN
COUT
2
8
VIN
SW
Up to 10 in series
Or up to 10S4P
7
VOUT
SGM3736
6
5
FB
3
EN/PWM
GND
4
PWM Dimming
1kΩ
PGND RSET
1
RSET
Figure 1. Typical Application Circuit
SG Micro Corp
www.sg-micro.com
3
SGM3736
PWM Dimming, 38V Step-Up LED Driver
ELECTRICAL CHARACTERISTICS (1)
(VIN = 3.6V, L = 10μH, CIN = 10μF, COUT = 0.47μF, Full = -40℃ to +85℃, typical values are at TA = +25℃, unless otherwise
noted.)
PARAMETER
IC SUPPLY
SYMBOL
CONDITIONS
TEMP
MIN
TYP
MAX UNITS
Input Voltage Range
VIN
Full
2.7
5.5
2.6
V
V
Input Under-Voltage Lockout
UVLO Hysteresis
UVLO
VHYS
Rising edge
2.5
0.15
0.20
0.72
0.1
+25℃
+25℃
+25℃
+25℃
+25℃
V
Quiescent Current (Non Switching)
Operating Current (Switching)
VFB = 0.4V
VFB = 0V
VEN = 0V
0.35
1.5
1
mA
mA
μA
IQ
VIN Pin Shutdown Current
ISHDN
STEP-UP CONVERTER
Voltage Feedback Regulation Voltage
VREF
Full
192
3.5
200
6
212.5
8.5
mV
mV
Voltage Feedback Regulation Voltage
Under Brightness Control
VREF_PWM fPWM = 10kHz, duty cycle = 3%
+25℃
VREF Filter 3dB Frequency
SW Pin Leakage Current
fREF(3dB)
ISW
600
Hz
+25℃
+25℃
0.01
1
μA
Peak NMOS Current Limit
Oscillator Frequency
Over-Voltage Threshold
Start-Up Time
ILIM
1.35
1.10
38.0
800
A
MHz
V
+25℃
Full
fS
0.90
35.5
1.4
VOVP
tS
Measured at VOUT pin
Full
40.5
μs
+25℃
CONTROL
Logic Low Threshold
Logic High Threshold
PWM Dimming Frequency Range
VIL
VIH
Full
Full
0.35
60
V
V
1.5
2
DFR
kHz
+25℃
Minimum Shutdown Pulse Width
Timing
tOFF
3
ms
℃
+25℃
Junction Thermal Shutdown Threshold
150
15
Junction
Thermal
Shutdown
℃
Hysteresis
NOTE:
1. The SGM3736 is guaranteed to meet performance specifications over the -40℃ to +85℃ operating temperature range by
design, characterization and correlation with statistical process controls.
SG Micro Corp
www.sg-micro.com
4
SGM3736
PWM Dimming, 38V Step-Up LED Driver
RECOMMENDED COMPONENTS OF TEST CIRCUITS
COMPONENT
22μH/CD75NP-220KC
10μH/CD75NP-100KC
MBR0540
COMPONENT
10μF/C2012X7R1H106KT
0.47μF/C2012X7R1H474KT
INDUCTOR
DIODE
CAPACITOR
TYPICAL PERFORMANCE CHARACTERISTICS
TA = +25℃, L = 10μH, CIN = 10μF, COUT = 0.47μF, unless otherwise noted.
Switching Waveform
Open LED Protection
VFB
VSW
AC Coupled
VOUT
VOUT
IL
IL
VIN = 3.6V, ILED = 20mA, L=10μH, 8 LEDs
Time (1μs/div)
VIN = 3.6V, ILED = 20mA, L = 10μH, 8 LEDs
Time (100μs/div)
Start-Up
Output Ripple at PWM Dimming
PWM
VOUT
ILED
VEN
AC Coupled
VOUT
IL
VIN = 3.6V, ILED = 20mA, fPWM = 10kHz, 8 LEDs
VIN = 3.6V, ILED = 20mA, L = 10μH, 8 LEDs
Time (1ms/div)
Time (100μs/div)
SG Micro Corp
www.sg-micro.com
5
SGM3736
PWM Dimming, 38V Step-Up LED Driver
TYPICAL PERFORMANCE CHARACTERISTICS
TA = +25℃, L = 10μH, CIN = 10μF, COUT = 0.47μF, unless otherwise noted.
Feedback Voltage vs. Temperature
Feedback Voltage vs. Input Voltage
DPWM = 100%
215
210
205
200
195
190
185
215
210
205
200
195
190
185
VIN =3.6V, DPWM = 100%
-50
-25
0
25
50
75
100
2.5
3
3.5
4
4.5
5
5.5
Input Voltage (V)
Temperature (
)
℃
Efficiency vs. Input Voltage
ILED = 20mA, L = 10μH
Efficiency vs. Input Voltage
ILED = 20mA, L = 22μH
90
86
82
78
74
70
90
86
82
78
74
70
10 LEDs (32V)
10 LEDs (32V)
2.5
3
3.5
4
4.5
5
5.5
2.5
3
3.5
4
4.5
5
5.5
Input Voltage (V)
Input Voltage (V)
Efficiency vs. Output Current
LED Current vs. PWM Duty Cycle
90
85
80
75
70
65
60
24
21
18
15
12
9
VIN = 3.6V, L = 10μH
VIN = 3.6V, ILED = 20mA, L = 10μH, 6 LEDs
fPWM = 2kHz
fPWM = 20kHz
6
3
10 LEDs (32V)
0
0
5
10
15
20
25
30
0
20
40
60
80
100
Output Current (mA)
PWM Duty Cycle (%)
SG Micro Corp
www.sg-micro.com
6
SGM3736
PWM Dimming, 38V Step-Up LED Driver
FUNCTIONAL BLOCK DIAGRAM
VIN
VOUT
SW
SGM3736
VIN
Ramp
Oscillator
Over-Voltage
Protection
Thermal
Shutdown
Generator
FB
LED Current
Control
Current
Sense
RSET
PWM Control
COMP
and
Gm
Gate Drive
VREF
Current
Limit
Voltage
Reference and
PWM
Dimming
Control
Input Logic
and DAC
Current
Sense
EN/PWM
500kΩ
Pull-Down Resistor
GND
PGND
Figure 2. SGM3736 Block Diagram
FUNCTIONAL DESCRIPTION
The
SGM3736
uses
a
constant-frequency
Switching will stop when the output reaches the OVP
threshold. The OVP feature protects the IC from
damaging itself by exceeding the voltage rating on
SW/VOUT pins.
current-mode boost converter architecture to control
the LED current by regulating the feedback voltage.
Please refer to the FUNCTIONAL BLOCK DIAGRAM
above for an explanation of SGM3736 operation. The
beginning of each cycle turns on the Power MOSFET.
A slope compensation ramp is added to the output of
the current sense amplifier and the result is fed into the
positive input of the comparator (COMP). When this
voltage goes above the output voltage of the error
amplifier (Gm), the Power MOSFET is turned off. The
voltage at the output of the Gm block amplifies the
difference between the reference voltage and the
feedback voltage (FB), so that FB voltage can be
regulated to the reference voltage.
For the brightness dimming control of the SGM3736,
the IC provides typically 200mV feedback voltage when
the EN/PWM pin is pulled constantly high. However,
EN/PWM pin allows a PWM signal to reduce this
regulation voltage by changing the PWM duty cycle to
achieve LED brightness dimming control. An internal
low pass filter (600Hz) is used to filter the pulse signal.
The relationship between the duty cycle and FB voltage
can be calculated as following equation.
V
FB = Duty × 200mV
The SGM3736 has built-in soft-start to limit the inrush
current during startup and to limit the amount of
overshoot on the output. Protection features in the
SGM3736 include over-voltage protection (OVP),
cycle-by-cycle current limit protection and thermal
shutdown. OVP protects in the event where an LED
fails open, which forces the feedback voltage to zero.
This causes the boost converter to operate in maximum
duty cycle mode, ramping up the output voltage.
Where:
Duty = duty cycle of the PWM signal
200mV = internal reference voltage
The PWM frequency is in the range from 2kHz to
60kHz, and the recommended minimum PWM duty
cycle is 3% for no blind dimming.
SG Micro Corp
www.sg-micro.com
7
SGM3736
PWM Dimming, 38V Step-Up LED Driver
APPLICATION INFORMATION
dimming duty cycle = 100%. The LED current is
Inductor Selection
programmed according to the formula IMAX
=
A 6.8μH to 22μH inductor is recommended for 10/8/6
series LED applications and 10S4P LED applications. If
high efficiency is a critical requirement, a low DCR
inductor should be selected. The inductor’s saturation
current rating should also exceed the peak input
current, especially for high load current application (like
10S4P).
200mV/RSET. For accurate LED current settings,
precision 1% resistors are recommended. The formula
and table for RSET selection are shown below.
RSET = 200mV/IMAX
Table 1. Current Setting Resistor
RSET (Ω)
IMAX Current (mA)
Capacitor Selection
200
1
5
Small size ceramic capacitors are ideal for SGM3736
application. An input capacitor in the range of 1μF to
22μF and a 0.47μF output capacitor are suggested for
10/8/6 series LED applications. For higher output
current applications like 10S4P, larger value output
capacitors like 2.2μF are recommended to minimize
output ripple.
40.2
20.0
13.3
10.0
6.65
2.00
10
15
20
30
100
Diode Selection
Layout Considerations
The current rating of the Schottky diode should exceed
the peak current of the boost converter. The voltage
rating should also exceed the target output voltage.
PCB layout is very important for high frequency
switching regulators in order to keep the loop stable
and minimize noise. The input capacitor should be very
close to the IC to get the best decoupling. The path of
the inductor and output capacitor should be kept as
short as possible to minimize noise and ringing.
LED Maximum Current Setting
LED maximum current setting, IMAX, is determined by
the feedback resistor (RSET in Figure 3). The feedback
voltage is internally set at 200mV when the PWM
10μH
Input Power
2.7V~30V
L
D1
CIN
COUT
20mA
10-Series White LEDs
22μF
0.47µF
8
SW
Bias Voltage
2.7V~5.5V
2
3
7
6
5
VIN
VOUT
FB
SGM3736
C1
0.1µF
PWM
Dimming
EN/PWM
1kΩ
GND
4
PGND RSET
1
RSET
10Ω
Figure 3. Application Circuit for 10 LEDs in Series with 20mA Current (VIN can be tied to input power rail if less than 5.5V)
SG Micro Corp
www.sg-micro.com
8
PACKAGE INFORMATION
PACKAGE OUTLINE DIMENSIONS
TDFN-2×2-8L
D
e
N8
E1
D1
L
E
k
N4
N1
b
BOTTOM VIEW
TOP VIEW
1.20
0.65
0.60 1.95
A
A1
A2
SIDE VIEW
0.24
0.50
RECOMMENDED LAND PATTERN (Unit: mm)
Dimensions
Dimensions
In Millimeters
In Inches
Symbol
MIN
MAX
0.800
0.050
MIN
MAX
0.031
0.002
A
A1
A2
D
0.700
0.000
0.028
0.000
0.203 REF
0.008 REF
1.900
1.100
1.900
0.500
2.100
1.300
2.100
0.700
0.075
0.043
0.075
0.020
0.083
0.051
0.083
0.028
D1
E
E1
k
0.200 MIN
0.500 TYP
0.008 MIN
0.020 TYP
b
0.180
0.250
0.300
0.450
0.007
0.010
0.012
0.018
e
L
TX00056.000
SG Micro Corp
www.sg-micro.com
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
Quadrant
Package Type
W1
(mm)
(mm) (mm) (mm) (mm) (mm) (mm) (mm)
TDFN-2×2-8L
7″
9.5
2.30
2.30
1.10
4.00
4.00
2.00
8.00
Q1
TX10000.000
SG Micro Corp
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
TX20000.000
SG Micro Corp
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