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LT1956IGN データシート(PDF) 24 Page - Linear Technology

部品番号 LT1956IGN
部品情報  High Voltage, 1.5A, 500kHz Step-Down
PDF  28 Pages
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メーカー  LINER [Linear Technology]
ホームページ  http://www.linear.com
Logo LINER - Linear Technology

LT1956IGN データシート(HTML) 24 Page - Linear Technology

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24
LT1956/LT1956-5
1956f
couples energy to L2 and ensures equal voltages across
L2 and L1 during steady state. Instead of using a trans-
former for L1 and L2, uncoupled inductors were used
because they require less height than a single transformer,
can be placed separately in the circuit layout for optimized
space savings and reduce overall cost. This is true even
when the uncoupled inductors are sized (twice the value of
inductance of the transformer) in order to keep ripple
current comparable to the transformer solution. If a single
transformer becomes available to provide a better height/
cost solution, refer to the dual output SEPIC circuit de-
scription in Design Note 100 for correct transformer
connection.
During switch on-time, in steady state, the voltage across
both L1 and L2 is positive and equal; with energy (and
current) ramping up in each inductor. The current in L2 is
provided by the coupling capacitor C4. During switch off-
time, current ramps downward in each inductor. The
APPLICATIO S I FOR ATIO
VOUT1**
5V
VOUT2**
†
–5V
*SUMIDA CDRH4D28-150
**SEE FIGURE 14c FOR VOUT1, VOUT2
LOAD CURRENT RELATIONSHIP
† IF LOAD CAN GO TO ZERO, AN OPTIONAL
PRELOAD OF 500
Ω CAN BE
USED TO IMPROVE REGULATION
VIN
9V TO 12V
(TRANSIENTS
TO 36V)
GND
1956 F14a
C2
0.1
µF
CF
220pF
RC
2.2k
D1
B0540W
C5
10
µF
6.3V
CER
C6
10
µF
6.3V CER
C3
2.2
µF
50V
CERAMIC
C4
10
µF
6.3V
CER
D2
MMSD914TI
D3
B0540W
L1*
15
µH
L2*
CC
3300pF
R1
15.4k
R2
4.99k
+
+
+
BOOST
VIN
LT1956
SHDN
SYNC
SW
FB
VC
GND
Figure 14a. Dual Polarity Output Converter
VOUT1 LOAD CURRENT (mA)
0
0
50
150
200
250
500
350
200
400
1956 F15b
100
400
450
300
600
800
Figure 14b. VOUT2 (–5V) Maximum
Allowable Load Current vs VOUT1
(5V) Load Current
VOUT2 LOAD CURRENT (mA)
0
4.75
4.85
4.95
5.05
5.15
100
200
300
400
1956 F14c
500
600
5.25
4.80
4.90
5.00
5.10
5.20
5.30
VOUT1 LOAD CURRENT
750mA
VOUT1 LOAD CURRENT
250mA
VOUT1 LOAD CURRENT
500mA
VOUT2 LOAD CURRENT (mA)
0
60
80
100
400
1956 F14d
40
20
50
70
90
30
10
0
100
200
300
500
VOUT1 LOAD CURRENT
750mA
VOUT1 LOAD CURRENT
250mA
Figure 14c. VOUT2 (–5V) Output
Voltage vs Load Current
Figure 14d. Dual Polarity Output
Converter Efficiency



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