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DC-DC Converter (Control) ICs [Synchronous rectifi cation type]
DC-DC Converter (Control) ICs [Synchronous rectifi cation type]
LV5050V
LV5050V
■ Applications
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
7.5V to 16V
Programmable
Step down
1ch
4.5V to 6V
externally
Voltage
and
BG
Current
BG
generator
refrrence
IREF
Current
4.2V
bias
/ 3.8V
Vref
0.8V
COMP
CH1
Output
error amp
FB
PWM comp
UV
Vref
0.87Vref
3.5μA
1.6V
Corrective
SS
ramp
SSEND
SD
0 deg
5μA
TD
POR
CONT1
2.4V
CONT
POR
5μA
UV
UV_timeout
SSEND
2.4V
UV_DELAY
PGOOD
15
unit: mm
6.5
20
11
1
10
0.65
0.22
0.15
(0.33)
SANYO: SSOP20(225mil)
Power Stages
Package
External (NMOS)
SSOP20(225mil)
Block Diagram
Input Power
V IN
Supply
POR
VLIN5
5V REG
Vref
(Allways ON)
Internal
Bias
8.3μA
ILIM
ILIM
Comp
RSNS
ISENSE
Amp
CBOOT
Shifter
& latch
R
Q
PWM logic
HDRV
SKIP control
S
Q
CH1
SW
Output
Shoot through
protection
sequencer
SD
V DD
LDRV
Active
PGND
discharge
Rdson=
15Ω
R
Q
S
Q
0
deg
OSC
300kHz
CT
CLKO
SGND
SYNC. pulse out
5V
0V
AC-DC Converter (Control) ICs
AC-DC Converter (Control) ICs
LA5648
LA5648
■ Applications
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
RCC/separately-excited fl y-back AC-DC converter
controller
1.2V Vref
OUT
LOGIC
OCL
TRIANG OSC
unit: mm
9.14
8
5
1
4
1.0
1.4
(0.76)
2.54
0.5
SANYO: DIP8(300mil)
V CC
Features
UVLO, primary side PbyPOCP,
30
secondary side timer type OCP
Block Diagram
Np
Nb
V CC
UVLO
3.5V REG
-
+
DET COMP
3.5V
SYC
PWM COMP
+
- -
+
-
TIMER
COM
CF
CT
PC
PC
Package
DIP8(300mil)
16
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