R1218X Datasheet, PDF (2/14 Pages) RICOH electronics devices division – Step-up DC/DC converter for Whilte LED Backlight

R1218X
BLOCK DIAGRAMS
• R1218XXX1A
V FB
V IN
Err. Amp
+
–
Vref
PWM Comp
+
–
RQ
S
Oscillator
Slope
Compensation
Shu _tdown
delay
Σ
CE
LX
UVLO
Switch
Control
Current
Protect
Current
sense
V OUT
OVP
• R1218XXX2A
VFB
CE
VIN
Err. Amp
+
–
Vref
PWM Comp
+
–
RQ
S
Oscillator
Slope
Compensation
Shutdown
delay
Σ
CE
GND
LX
UVLO
Switch
Control
Current
Protect
Current
sense
V OUT
OVP
CE
GND
2