BD6067GU_11 ROHM [Rohm], BD6067GU_11 Datasheet - Page 7

• Manufacturer Part Number: BD6067GU_11
• Description: White Backlight LED Drivers for Small to Medium LCD Panels (Switching Regulator Type)
• Manufacturer: ROHM [Rohm]

© 2011 ROHM Co., Ltd. All rights reserved.
BD6067GU, BD6069GUT, BD6071HFN, BD6072HFN
►BD6067GU
●Startup and Rush Current
●Application Circuit Example
www.rohm.com
BD6067GU has a built-in soft start function. This function prevents the rush current from being generated at startup time.
The output maximum voltage range of BD6067GU is 30V.
*** When LED has 8 lights, special care should be taken to prevent output voltage (VOUT) from exceeding 30V.
VOUT = (LED vf × number of LED lights) + Vfb
Vin
Vin
1µF
Cin
1µF
Cin
Fig.18 Example of Dimming Circuit Subject to PWM Control at the VDAC Pin
22µH
22µH
Vin
Vin
L1
Q1
L1
Q1
GND
GND
SW
SW
GNDA
GNDA
Q
Current
Sence
Q
Current
Sence
S
R
300kΩ
S
R
300kΩ
Shutdown
OFF ON
Thermal
OFF ON
Fig.17 Soft Start Circuit
D1
TSD
D1
Shutdown
Thermal
Control
EN
TSD
Control
EN
7/29
PWMcomp
Output open
PWMcomp
Output open
Over voltage
Over voltage
protect
protect
protect
protect
-
+
+
-
-
OSC
OSC
+
+
ERRAMP
ERRAMP
Soft start circuit
+
-
+
-
+
-
+
-
-
+
-
+
14kΩ
14kΩ
98kΩ
98kΩ
VFB
VDAC
Vout
VDAC
V
Vout
0~1.8V
VDAC
FB
R2
10kΩ
1kHz
10Ω
10Ω
R1
R1
1µF
I
I
LED
LED
Cout
2011.01 - Rev.C
Technical Note
1µF
Cout
1µF