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508581F Datasheet

  • 508581F

  • IC

  • 292.61KB

  • 16頁

  • ETC

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LT1074/LT1076
Step-Down Switching
Regulator
FEATURES
s
s
s
s
s
s
s
s
5A On-Board Switch (LT1074)
100kHz Switching Frequency
Greatly Improved Dynamic Behavior
Available in Low Cost 5 and 7-Lead Packages
Only 8.5mA Quiescent Current
Programmable Current Limit
Operates Up to 60V Input
Micropower Shutdown Mode
tions allow this device to be used as a positive-to-negative
converter, a negative boost converter, and as a flyback
converter. The switch output is specified to swing 40V
below ground, allowing the LT1074 to drive a tapped-
inductor in the buck mode with output currents up to 10A.
The LT1074 uses a true analog multiplier in the feedback
loop. This makes the device respond nearly instanta-
neously to input voltage fluctuations and makes loop gain
independent of input voltage. As a result, dynamic behav-
ior of the regulator is significantly improved over previous
designs.
On-chip pulse by pulse current limiting makes the LT1074
nearly bust-proof for output overloads or shorts. The input
voltage range as a buck converter is 8V to 60V, but a self-
boot feature allows input voltages as low as 5V in the
inverting and boost configurations.
The LT1074 is available in low cost TO-220 or TO-3
packages with frequency pre-set at 100kHz and current
limit at 6.5A (LT1076 = 2.6A). A 7-pin TO-220 package is
also available which allows current limit to be adjusted
down to zero. In addition, full micropower shutdown can
be programmed. See Application Note 44 for design
details.
A fixed 5V output, 2A version is also available. See LT1076-5.
APPLICATI
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Buck Converter with Output Voltage Range of 2.5V
to 50V
Tapped-Inductor Buck Converter with 10A Output
at 5V
Positive-to-Negative Converter
Negative Boost Converter
Multiple Output Buck Converter
DESCRIPTIO
The LT1074 is a 5A (LT1076 is rated at 2A) monolithic
bipolar switching regulator which requires only a few
external parts for normal operation. The power switch, all
oscillator and control circuitry, and all current limit com-
ponents, are included on the chip. The topology is a classic
positive 鈥渂uck鈥?configuration but several design innova-
TYPICAL APPLICATI
Basic Positive Buck Converter
L1**
50
碌
H (LT1074)
100
碌
H (LT1076)
10V TO 40V
LT1074
GND
V
C
FB
R3
2.7k
C3
鈥?/div>
200
碌
F
MBR745*
R1
2.8k
1%
R2
2.21k
1%
+
+
C2
0.01
碌
F
C1
500
碌
F
25V
*USE MBR340 FOR LT1076
**COILTRONICS #50-2-52 (LT1074)
#100-1-52 (LT1076)
PULSE ENGINEERING, INC.
#PE-92114 (LT1074)
#PE-92102 (LT1076)
HURRICANE #HL-AK147QQ (LT1074)
#HL-AG210LL (LT1076)
鈥?/div>
RIPPLE CURRENT RATING
鈮?/div>
I
OUT
/ 2
EFFICIENCY (%)
V
IN
V
SW
UO
U
UO
S
Buck Converter Efficiency
LT1074
100
5V
5A
90
80
V
OUT
= 12V, V
IN
= 20V
V
OUT
= 5V, V
IN
= 15V
70
60
50
0
1
2
3
4
5
6
OUTPUT LOAD CURRENT (A)
LT1074 鈥?TPC27
L = 50
碌
H TYPE 52 CORE
DIODE = MBR735
LT1074 鈥?TA01
1

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