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■
Applications
unit: mm
SANYO: SSOP20(225mil)
DC-DC converter
■
Functions/Features
●
Step-down DC-DC converter controller with 1-channel
●
Input UVLO circuit, overcurrent detection function,
soft start/soft stop function, start-up delay circuit
●
Output voltage monitor function
(Under voltage protection with power good and timer
latch)
●
Synchronized operation is possible between different
devices
Type Input Voltage
Output Voltage
Channels
Power Stages Package
Step down
7.5V to 16V
4.5V to 6V
Programmable
externally
1ch External (NMOS) SSOP20(225mil)
DC-DC Converter (Control) ICs [Synchronous rectifi cation type]
DC-DC Converter (Control) ICs [Synchronous rectifi cation type]
LV5050V
LV5050V
Block Diagram
8.3μA
R
S
Q
Q
R
S
Q
Q
POR
UV_DELAY
SGND
Vref
error amp
FB
CH1
Output
COMP
BG
refrrence
BG
IREF
Vref
ILIM
Comp
LDRV
V
DD
SW
HDRV
CBOOT
RSNS
V
IN
PGND
UV
CT
CLKO
0 deg
VLIN5
POR
UV_timeout
SYNC. pulse out
Vref
0.8V
SS
5μA
3.5μA
TD
2.4V
SD
POR
SSEND
1.6V
CONT1
PGOOD
SSEND
5μA
2.4V
SD
0V
5V
0.87Vref
UV
CONT
ISENSE
Amp
ILIM
PWM comp
Voltage
and
Current
generator
Current
bias
Corrective
ramp
PWM logic
SKIP control
Shifter
& latch
Shoot through
protection
sequencer
Active
discharge
Rdson=
15Ω
Internal
Bias
5V REG
(Allways ON)
4.2V
/ 3.8V
0
deg
OSC
300kHz
Input Power
Supply
CH1
Output
6.5
4.4
6.4
0.22
0.65
(0.33)
110
1120
0.5
0.15
1.5max
0.1
(1.3)
■
Applications
unit: mm
SANYO: DIP8(300mil)
RCC power supply controller
■
Functions/Features
●
RCC power supply controller
●
Overcurrent detection function
●
Soft start function
●
Input UVLO circuit
●
Output overcurrent protection timer function
●
Base winding voltage detection function
Functions V
CC
Features Package
RCC/separately-excited fl y-back AC-DC converter
controller
30
UVLO, primary side PbyPOCP,
secondary side timer type OCP
DIP8(300mil)
AC-DC Converter (Control) ICs
AC-DC Converter (Control) ICs
LA5648
LA5648
Block Diagram
V
CC
Np
Nb
+
-
+
-
-
+
-
3.5V REG
1.2V Vref
OUT
OCL
TRIANG OSC
TIMER
CF
CT
PC
PC
COM
SYC
UVLO
3.5V
DET COMP
PWM COMP
LOGIC
9.14
14
85
1.4
1.0
6.4
7.62
0.25
(3.0)
3.9MAX
0.51MIN
3.2
(0.76)
2.54
0.5