R1202L711A-TR [RICOH]
Switching Regulator, 0.45A, 1400kHz Switching Freq-Max, CMOS, PDSO6, 1.60 X 1.60 MM, HALOGEN FREE AND ROHS COMPLIANT, DFN-6;型号: | R1202L711A-TR |
厂家: | RICOH ELECTRONICS DEVICES DIVISION |
描述: | Switching Regulator, 0.45A, 1400kHz Switching Freq-Max, CMOS, PDSO6, 1.60 X 1.60 MM, HALOGEN FREE AND ROHS COMPLIANT, DFN-6 开关 光电二极管 |
文件: | 总2页 (文件大小:318K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
R1202x Series
PWM Step-up DC/DC Converter for White LED/PMOLED and General Use with shutdown function
The R1202x Series are CMOS-based PWM step-up DC/DC converters, which are optimized to drive white LEDs and PMOLED with constant current.
There are two types. The A/B versions are optimized for the general use or the drive of PMOLED, and the D version is optimized for the serial drive
of white LED with constant current. The R1202x includes an under-voltage lockout circuit (UVLO), a soft-start circuit, and an over-voltage protection
circuit (OVP), a thermal shutdown circuit. By simply using an inductor, divider resistors, and capacitors as external components, PMOLED and
white LEDs can be driven with high efficiency. At the standby mode, the internal NPN transistor can separate the output from the input. (Shutdown
function) The A/B version with auto-discharge function is selectable. D Version can set the LED current with feedback resistor (R1). The brightness
of the LEDs and the soft-start time can be adjusted by applying a PWM signal (200Hz to 300kHz) to the CE pin. In addition to DFN1616-6B, 0.95mm
thickness TSOT-23-6 is available.
FEATURES
• Supply Current (IDD)····························· Typ. 800μA (No switching)
• Coil-current Limit Circuit ·················Current Limit Typ. 350mA
/ Typ. 700mA selectable
• Over Voltage Protection Circuit (OVP)
• Soft Start Time (tstart) ·······················Typ. 2ms (A/B Version)
Controllable by PWM signal
• Standby Current (Istandby
)
······················· Max. 5μA (CE="L"
)
• Input Voltage Range (VIN)···················· 2.3V to 5.5V (A/B Version)
1.8V to 5.5V (D Version)
• Feedback Voltage (VFB
)
······················ 1.0V (A/B Version)
0.2V (D Version)
to the CE pin (D Version)
• Feedback Voltage Accuracy ················ ± 15mV (A/B Version)
• Thermal Shutdown Circuit ··············Stops at 150°C
• Auto-discharge Function·················A Version
• Shutdown Function
± 10mV (D Version)
• Oscillator Frequency (fosc)···················· 1.2MHz
•
········ Min. 86%, Typ. 91%
•
·······D Version
• OUsVcLillaOtoDr MeatexicmtuVmoDltuatgy eCy(cVleU(VMLOa)xd··u·t·y·)········· Typ. 2.0V (A/B Version)
• LPEaDckHaiggeh-ss·p··e·e··d···D··i·m···m··i·n··g···C··o··n··tr··o·l········DFN1616-6B, TSOT-23-6
Typ. 1.6V (D Version)
BLOCK DIAGRAMS
R1202xxxxA
R1202xxxxB
R1202xxxxD
(With Auto-discharge function, VFB=1.0V)
(Without Auto-discharge function, VFB=1.0V) (Without Auto-discharge function, VFB=0.2V)
VFB
VIN
L
X
VOUT
VFB VIN LX VOUT
VFB VIN LX VOUT
UVLO
UVLO
UVLO
Error Amp.
Error Amp.
Error Amp.
Switch
Control
Switch
Control
Switch
Control
PWM Comp.
PWM Comp.
PWM Comp.
Driver
Control
Driver
Control
Driver
Control
R
Q
R
Q
R
Q
S
S
S
Vref
PWM
Vref
Vref
OSC
OSC
OSC
OVP
OVP
OVP
EN
Cntrl
Soft Start
Soft Start
Slope
Compensation
Current
Limit
Current
Sense
Slope
Compensation
Current
Limit
Current
Sense
Slope
Compensation
Current
Limit
Current
Sense
Thermal
Shutdown
Thermal
Shutdown
Thermal
Shutdown
Shutdown
delay
Chip Enable
Chip Enable
Chip Enable
Σ
Σ
Σ
CE
GND
CE
GND
CE
GND
SELECTION GUIDES
TYPICAL APPLICATIONS
R1202xxxxA/B
R1202xxxxD
Halogen Free
Package
Q'ty per Reel
Part No.
L1
10μH to 22μH
L1
R1202L
R1202L
.
x$
1
.
∗-TR
#-TR
.
.
10μH to 22μH
DFN1616-6B 5,000 pcs
TSOT-23-6 3,000 pcs
y
$
.
1.
C1
1μF
C1
1μF
C2
0.22μF
R1202N
R1202N
.
.
x$
.
.
3
.
∗-TR-FE
#-TR-FE
V
IN
LX
VIN
LX
y
$
3.
.
x
.
:
Specify the OVP voltage.
CE
VOUT
CE
VOUT
(
.
3
.
) 14V, (
.
4
.
) 17V, (
.5
.
) 19V, (
.
6
.
) 21V, (
.
7.
) 23V
C3
R3
C2
1μF
R2
R1
y
.
.
: Specify the OVP voltage.
(
.
3
.
) 14V, (
.
7
.
) 23V
GND
VFB
GND
VFB
R1
10Ω
$
: Specify the Coil Current limit.
.
.
(
.
1
.
) Typ. 350mA, (
.
2
.
) Typ. 700mA
: (
(
: (
.
.
.
A
B
D
.
.
.
)
)
)
with auto-discharge function, VFB=1.0V
without auto-discharge function, VFB=1.0V
without auto-discharge function, VFB=0.2V.
.
.
∗
.
TYPICAL CHARACTERISTICS
.
#
.
R1202N713D Efficiency vs. Output Current
PACKAGES (Top View)
5LEDs
(
10μH
)
5LEDs (22μH)
90
85
80
75
70
65
60
55
50
90
85
80
75
70
65
60
55
50
DFN1616-6B
TSOT-23-6
6 5 4
6
5
4
∗
1
2
3
1
2
3
V
V
V
V
IN=5.0V
IN=4.2V
IN=3.6V
IN=3.0V
V
V
V
V
IN=5.0V
IN=4.2V
IN=3.6V
IN=3.0V
1
2
3
CE
VFB
Lx
4
5
6
GND
VIN
VOUT
1
2
3
CE
VOUT
VIN
4
5
6
Lx
GND
VFB
0
5
10
15
20
0
5
10
15
20
Output Current IOUT (mA)
Output Current IOUT (mA)
The tab is substrate level (GND).
∗)
APPLICATIONS
• PMOLED power supply for hand-held equipment
• White LED backlight for hand-held equipment
No.EK-255-121001
Step-up DC/DC Converter
R1202x Series
Step-up DC/DC Converter
PWM Step-up DC/DC Converter for White LED/PMOLED and General Use with shutdown function
R1202x Version Lineup
Product Name
Application
R1202xxxxA/B
PMOLED, General Use
R1202xxxxD
White LED (Serial drive)
0.2V
VFB Voltage
1.0V
Input Voltage Range
OVP Voltage
Function
2.3V to 5.5V
1.8V to 5.5V
Select from 14V, 17V, 19V, 21V, 23V
Thermal Shutdown Circuit
Shutdown Function
Select from 14V, 23V
Thermal Shutdown Circuit
Shutdown Function
Auto-discharge Function
1μF to 4.7μF
The Method of Output Voltage Setting
LED High-speed Dimming Control
0.22μF to 1μF
LED Current setting
Output Capacitor
Comment
When CE pin input is "H" (Duty=100%), LED current can be set
with feedback resistor (R1).
Output Voltage= (R1+ R2) / R1
L1
10μH
L1
10μH
ILED=0.2 / R1
C1
1μF
C1
1μF
C2
0.22μF
VIN
LX
VIN
LX
CE
VOUT
CE
VOUT
C3
R3
C2
1μF
R2
R1
GND
VFB
GND
VFB
R1
10Ω
The total value of R1 and R2 should be equal or less
than 300kΩ.
Voltage rating of capacitor (C2) is recommended to
LED Dimming Control
The LED brightness can be controlled by inputting the PWM
signal to the CE pin. The current of LEDs when High-Duty of the
CE input is ”Hduty” reaches the value as in next formula.
ILED=Hduty × VFB / R1
use 1.5 times or more the output setting voltage.
Soft-Start Time
The soft start time is set to Typ. 2ms within the IC.
The frequency of the PWM signal is using the range between
200Hz to 300kHz. When controlling the LED brightness by the
PWM signal of 20kHz or less, the increasing or decreasing of
the inductor current might be make a sounds in the hearable
sound wave area. In that case, please use the PWM signal in
the high frequency area.
In case of 6 lights or more, we recommends the R1205x Series and R1218x Series*.
More than 5 lights of R1218x Series requires an external diode and OVP Voltage is set up to 31.5V. (Maximum rating of VOUT pin is 34V)
∗) For detail, please check our website.
The currently available information as of October 2012 is provided in this New Product News.
EK-255-121001
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