RT9284B-20GJ6E Richtek USA Inc, RT9284B-20GJ6E Datasheet - Page 2

• Manufacturer Part Number: RT9284B-20GJ6E
• Description: IC LED DVR WHITE BCKLGT TSOT23-6
• Manufacturer: Richtek USA Inc

Specifications of RT9284B-20GJ6E

• Constant Current: Yes
• Internal Driver: Yes
• Type - Primary: Backlight, Flash/Torch
• Type - Secondary: White LED
• Mounting Type: Surface Mount
• Topology: PWM
• Number Of Outputs: 1
• Frequency: 900kHz ~ 1.5MHz
• Voltage - Supply: 2.7 V ~ 5.5 V
• Package / Case: SOT-23-6 Thin, TSOT-23-6
• Operating Temperature: -40°C ~ 85°C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Output: -

RT9284A/B
Typical Application Circuit
2
www.richtek.com
2.7V to 5.5V
2.7V to 5.5V
2.7V to 5.5V
2.7V to 5.5V
V
V
IN
Dimming
IN
V
V
Control
Dimming
Dimming
IN
IN
Control
Control
+
+
+
+
100Hz-100kHz
100Hz-100kHz
100Hz-100kHz
Figure 4. Application for Constant Output Voltage
Figure 1. Application for Driving 3 Series WLEDs
Figure 2. Application for Driving 4 Series WLEDs
Figure 3. Application for Driving 5 Series WLEDs
1uF
C1
1uF
C1
1uF
1uF
C1
C1
6
4
2
6
4
2
VDD
EN
GND
6
4
6
4
2
2
VDD
EN
GND
4.7uH to 22uH
4.7uH to 22uH
VDD
EN
GND
VDD
EN
GND
RT9284A
4.7uH to 22uH
4.7uH to 22uH
RT9284B
RT9284
RT9284
L1
L1
L1
L1
OVP
OVP
FB
LX
OVP
OVP
LX
FB
FB
FB
LX
LX
1
5
3
1
5
3
1
5
3
1
5
3
V
OVP 15V
FB
SS0520
SS0520
SS0520
= 0.25V
D1
SS0520
D1
D1
D1
OVP
15V
600k
R2
OVP
20V
OVP
OVP
15V
18V
1uF/25V
C2
1uF/25V
1uF/16V
130k
R1
R2
15k
V
C2
C2
FB
= 1.235V
R1
R1
1uF/16V
C2
R1
DS9284A/B-06 June 2009
I
I
LED
LED
I
V
12V
LED
OUT