SC1132CT-2.5DB中文资料

2
4
6
8
Load Current (A)
3.3 2.9 2.5 1.8
10
SC113X
% Load Regulation 3.3V, 0.3 to 10 Amps
1.0
0.5
0.0
-0.5
-1.0
-1.5
-2.0
0
2
4
6
8
10
Load Current (A)
% Load Regulation 2.9V, 0.3 to 10 Amps
R2
C10
0.01uF
C9 1000uF +
Vout (LIN)
12V IN
C11 0.1uF
Revision 1, December 2000
1

SC113X
POWER MANAGEMENT Absolute Maximum Ratings
Operating Temperature Junction Operating Temperature Storage Temperature Lead Soldering Temperature Thermal Resistance, Junction to Case Thermal Resistance, Junction to Ambient
Typ VOUT
VOUT 1.250
1.250 0.005 0.035
0.05 0.2
1
1.1 10
0.004
Max +1% +2% 1.262 1.275 0.2 0.2
0.3 0.4
1.3 13 0.02
Units V V %
% V mA %/°C
ã 2000 Semtech Corp.
3

SC113X
Ordering Information
Part Number (1)
Package
Output Current
SC1131CT-XY
TO-220
1.5A
SC1132CT-XY
TO-220
3.0A
SC1133CT-XY
TO-220
5.0A
SC1134CT-XY
TO-220
7.5A
Note: (1) Where XY denotes voltage options and lead configurations. Available voltages (X) are: 1.5V, 2.5V and 3.3V. Available lead configurations (Y) are dual bend (DB), single bend (SB) and straight leads (leave blank). Sample part number: SC1133CT-2.5DB.
Switching Controller Section: The switching control section is a voltage mode controller designed for high current, low voltage power supply applications. Key features include a temperature compensated voltage reference, triangular oscillator and an internally compensated transconductance error amplifier. The switching controller operates at a fixed frequency of 200kHz, providing an optimum compromise between size, efficiency and cost in the intended application areas.
Switching Control Section
VCC = 12V; VIN = 5.0V; GND = PGND = 0V; VOUT = 2.8V. Per application circuit unless otherwise specifi
Symbol
Parameter
Conditions
u 85% typical efficiency for switching section u Grounded tab u 1.5, 2.5 or 3.3V @ 1% for linear section u Thermal shutdown u Internal short circuit protection (LDO) u 7 pin TO-220 package
Block Diagram
Vo Sense (3)
Vcc (5)
Vin (7)
1.25V REF OSCILLATOR
-
+
CONTROL
CURRENT LIMIT + -
THERMAL OVERLOAD
+ -
ERROR AMP
-
LEVEL SHIFT
+
AND DRIVE
GND (4)
Vout (6)
VO
5V
Fixed Voltage Version
Reference Voltage
VREF
5V
Adj Voltage Version
Line Regulation Fixed Voltage Version Adj Voltage Version
REG(LINE)
Load Regulation (1)
Linear Section
VCC = 12V; VIN = 5.0V; GND = PGND = 0V; VOUT = 3.3V. Per application circuit unless otherwise specified.
Parameter
Symbol
VIN
Output Voltage
Typical Application Circuit
5VIN
C1 0.1uF
+
C3
+ 1000uF
+
C2 1000uF
C4 1000uF
Q1 BUK556
R3 2.7
SC1133
L1 4uH
D1
C5 1000uF
+ C6
+ C7
+ C8
+
1000uF
1000uF
1000uF
Vout (SW) R1
Applications
u Microprocessor supplies u Modules supplies u 1.3V to 3.5V power supplies u Dual power supplies from 5V source
Linear Section: The linear portion is a high performance positive voltage regulator designed for use in applications requiring very low dropout performance at 1.5, 3, 5 and 7.5 Amps. Additionally, the linear section provides excellent regulation over variations due to changes in line, load or temperature.
1.0
0.5
0.0
-0.5
-1.0
-1.5
-2.0
0
2
4
6
8
10
Load Current (A)
% Load Regulation 2.3V, 0.2 to 10 Amps
1.0
0.5
0.0
-0.5
-1.0
-1.5
-2.0
0
rent (A)
% Load Regulation 1.8V, 0.2 to 10 Amps
REG(LOAD)
IR
Dropout Voltage (2)
VD
Io OmA
10mA
0mA 10mA
T (4) J
25°C
O.T. 25°C
O.T. 25°C O.T.
25°C O.T. 25°C
Min -1%
-2% 1.238
1.225
O.T.
Quiescent Current
IQ
5V
O.T.
Fixed Voltage Version
DH (1) PGND (2)
ã 2000 Semtech Corp.
4

POWER MANAGEMENT Typical Characteristics
SC113x Efficiency
95
90
PIN Descriptions
85
% Efficiency
80
75
70
0
Temp
Min
ICC
Total Quiescent Current Linear out =No Load
VREF
Reference Voltage
25°C 25°C
1.238
0-125°C 1.225
RegLOAD RegLINE
DHHI
DHLOW
fOSC
Load Regulation Line Regulation