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13 14
■
Applications
unit: mm
SANYO: MFP8(225mil)
DC-DC converter
■
Functions/Features
●
2A 1-channel step-down switching regulator
●
Wide input dynamic range (4.5 to 18V)
●
High effi ciency : 90% I
OUT
=1A, V
IN
=12V, V
O
=5V
●
Compact package : MFP8
●
Standby mode
●
Overcurrent protection
●
Thermal shutdown
●
Fixed frequency : 330kHz
●
Reference voltage : 0.8V
●
Soft start function
Type Input voltage
Output voltage
Channels
Power stages Package
Step down 4.5V to 18V
Programmable
externally
1ch Built in MFP8(225mil)
DC-DC Converter (Control) ICs [Step down]
DC-DC Converter (Control) ICs [Step down]
LV5803M
LV5803M
Block Diagram
Error Amp
Internal regulator
(5V)
V
IN
SW
GND
BOOT
PWM
comparator
Internal
regulator
TSD
EN
FB
COMP
UVLO
Current sense
Amp
SS
BOOT
SW
COMP
R10=4.3kΩ
R1=27kΩ
R3=10kΩ
R2=10kΩ
C4=OPEN
C3=1500pF
C6=0.015μF
open or H: ON
L:OFF
OSC
330kHz
Internal stable
supply
Vref
0.8V
Short
protect
circuit
Short
protect
circuit
BOOT(SW+Vreg.)
C2=10μF/25V
Rb=39
C1=0.022μF
V
IN
=12V
C8=10μF/25V
V
OUT
=3.3V
L1=10μH
C5=10μF/
10V X 3
Ro=open
• C1, C8, C5 = Ceramic capacitor used.
• L1 = CDRH105RNP-100NC (sumida made)
D1=SBM30-03
1:N
Pre-drive
14
85
5.0
0.63
6.4
0.15
0.35
1.27
(0.65)
4.4
(1.5)
1.7max
0.1
■
Applications
unit: mm
SANYO: TO-220FI5H-HB
Separately-excited step-down switching regulator
■
Functions/Features
●
Large current : I
O
max 8A (TN8D41A/51A)
: I
O
max 5A (TN5D41A/51A/61A)
●
High effi ciency :
Vertical-type P-channel power MOSFET built-in
●
High withstand voltage : V
IN
max 57V
●
Five external parts
●
Built-in reference oscillator (150kHz)
●
Built-in current limiter
●
Built-in thermal shutdown circuit
●
Built-in soft start circuit
●
ON/OFF function (shared with soft start pin)
Type Input voltage
Output voltage
Channels
Power stages
Package
Step
down
10V to 40V (TN8D41A/TN5D41A)
20V to 48V (TN8D51A/TN5D51A)
30V to 48V (TN5D61A)
5V/5A (TN5D41A), 5V/8A (TN8D41A),
12V/5A (TN5D51A), 12V/8A (TN8D51A),
24V/5A (TN5D61A)
1ch
Built in
(PMOS)
TO-220FI5H-HB
DC-DC Converter (Control) ICs [Separately-excited step-down]
DC-DC Converter (Control) ICs [Separately-excited step-down]
TN8D41A/51A, TN5D41A/51A/61A
TN8D41A/51A, TN5D41A/51A/61A
Block Diagram
+
GND
V
OUT
+
V
IN
GND
V
IN
SS
GND
SW
OUT
FB
Under Voltage
Protect
SOFTSTART
Band Gap
OSC
AMP
COMP
OUTPUT
Over
Temperature
Protect
Over Current
Protect
SENSE
Pch MOSFET
--
+
--
+
1
5
2
3
4
10.0
4.5
2.8
7.2
3.5
12.5
2.54
1.27
2.75
3.81
2.4
(5.9)
1.6
16.0
14.0
1
2
3
4
5
0.9
0.7
0.5
3.2
1.27
2.54