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PDF TD8202 Data sheet ( Hoja de datos )
| Número de pieza | TD8202 | |
| Descripción | Step-Up Converter | |
| Fabricantes | Techcode | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de TD8202 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
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T echcode®
DATASHEET
1MHz, High-Efficiency, Step-Up Converter for 2 to 8 White LEDs TD8202
General Description
Features
The TD8202A/B/C is a current-mode and fixed frequency boost
converter with an integrated N-FET to drive up to 8 white LEDs
in series.
The series connection allows the LED current to be identical for
uniform brightness. Its low on-resistance of NFET and
feedback voltage reduce power loss and achieve high
efficiency. Fast 1MHz current-mode PWM operation is
available for input and output capacitors and a small inductor
while minimizing ripple on the input supply. The OVP pin
monitors the output voltage and stops switching if exceeds the
over-voltage threshold. An internal softstart circuit eliminates
the inrush current during start-up.
The TD8202A/B/C also integrates under-voltage lockout,
over-temperature protection, and current-limit circuits. The
TD8202/A/B/C is available in a SOT-23-6 packages.
z Wide Input Voltage from 2.7V to 6V
z 0.25V Reference Voltage
z Fixed 1MHz Switching Frequency
z High Efficiency up to 87%
z 100Hz to 100kHz PWM Brightness Control Frequency
z Open‐LED Protection
z Under‐Voltage Lockout Protection
z Over‐Temperature Protection
z <1mA Quiescent Current Dduring Shutdown
z SOT‐23‐6 Packages
z Lead Free and Green Devices Available
z (RoHS Compliant)
Applications
z White LED Display Backlighting
z Cell Phone and Smart Phone
z PDA, PMP, MP3
z Digital Camera
December, 20, 2011 Techcode Semiconductor Limited www.techcodesemi.com
1
1 page  
T echcode®
DATASHEET
1MHz, High-Efficiency, Step-Up Converter for 2 to 8 White LEDs TD8202
Electrical Characteristics
The following specifications apply for VIN =3.6V TA=25 oC, unless specified otherwise.
TD8202A/B/C
Symbol Parameter
Test Conditions
Min. Typ.
SUPPLY VOLTAGE AND CURRENT
VIN Input Voltage Range
TA = -40 ~ 85°C, TJ = -40 ~ 125°C 2.7 -
IDD1
VFB = 1.3V, no switching
70 100
IDD2
FB = GND, switching
-1
ISD Input DC Bias Current
UNDER-VOLTAGE LOCKOUT
EN = GND
--
UVLO Threshold Voltage
UVLO Hysteresis Voltage
VIN Rising
2.0 2.2
50 100
REFERENCE AND OUTPUT VOLTAGES
VREF
Regulated Feedback Voltage
IFB FB Input Current
INTERNAL POWER SWITCH
FSW Switching Frequency
RON
Power Switch On Resistance
ILIM Power Switch Current-Limit
LX Leakage Current
DMAX
LX Maximum Duty Cycle
OUTPUT OVER-VOLTAGE PROTECTION
TA = 25°C
TA = -40 ~ 85°C (TJ = -40 ~ 125°C)
237
230
-50
250
-
-
FB=GND
VEN=0V, VLX=0V or 5V, VIN = 5V
0.8 1.0
- 0.6
0.7 0.9
-1 -
92 95
TD8202A
- 20
VOVP
Over-Voltage Threshold
OVP Hysteresis
OVP Leakage Current
ENABLE AND SHUTDOWN
VTEN
EN Voltage Threshold
EN Voltage Hysteresis
ILEN EN Leakage Current
OVER-TEMPERATURE PROTECTION
TOTP
Over-Temperature Protection
Over-Temperature Protection
TD8202B
TD8202C
VOVP =30V, EN=VIN
VEN Rising
VEN= 0~5V, VIN = 5V
TJ Rising
- 28
- 35
-3
--
0.4 0.7
- 0.1
-1 -
- 150
Hysteresis
40
Max.
Unit
6 V
130 µA
2 mA
1 µA
2.4 V
150 mV
263
270 mV
50 nA
1.2 MHz
-
1.2 A
1 µA
98 %
-
-
- V
- V
50 µA
1 V
- V
1 µA
- °C
°C
December, 20, 2011 Techcode Semiconductor Limited www.techcodesemi.com
5
5 Page 
T echcode®
DATASHEET
1MHz, High-Efficiency, Step-Up Converter for 2 to 8 White LEDs TD8202
Typical Application Circuit(Cont.)
Brightness Control Using a Filtered PWM Signal
Circuit for Driving 27 WLEDs
December, 20, 2011 Techcode Semiconductor Limited www.techcodesemi.com
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet TD8202.PDF ] | |
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