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ISL78268 Datasheet, PDF (14/33 Pages) Intersil Corporation – Integrated 2A sourcing
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ISL78268
Typical Performance
All the performance curves are taken from the Evaluation Board (ISL78268EVAL1Z) unless otherwise noted.
1400
100
1200
1000
800
600
400
95
90
85
VIN = 24V
VIN = 15V
80
VIN = 36V
75
70
VIN = 55V
65
200
00
50
100
150
200
250
300
RFSYNC (kΩ)
FIGURE 6. FREQUENCY SETTING (AT +25°C), VIN = 36V
60
55
VOUT = 12V, TA = +25°C
50
0
1
2
3
4
5
IOUT (A)
FIGURE 7. EFFICIENCY (AT +25°C): DE MODE, VOUT = 12V,
L = 4.7µH, fSW = 300kΩ
100
95
90
85
VIN = 25V
VIN = 15V
80
VIN = 36V
75
70
VIN = 55V
65
60
55
50 0
1
2
3
4
5
IOUT (A)
FIGURE 8. EFFICIENCY (AT +125°C): DE MODE, VOUT = 12V,
L = 4.7µH, fSW = 300kΩ
100
95
90
85
VIN = 25V
VIN = 15V
80
VIN = 36V
75
70
VIN = 55V
65
60
55
50 0
1
2
3
4
5
IOUT (A)
FIGURE 9. EFFICIENCY (AT -40°C), DE MODE, VOUT = 12V,
L = 4.7µH, fSW = 300kΩ
VIN: 5V/DIV
VOUT : 2V/DIV
PH: 10V/DIV
VIN: 5V/DIV
VOUT : 2V/DIV
PH: 10V/DIV
IL: 2A/DIV
2µs/DIV
FIGURE 10. DE MODE: VIN = 36V, VOUT = 12V, IOUT = 2.5A,
L = 4.7µH, COUT = 98µF, fSW = 300kHz (CONTINUOUS
CONDUCTION OPERATION)
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IL: 2A/DIV
2µs/DIV
FIGURE 11. DE MODE: VIN = 36V, VOUT = 12V, IOUT = 1.0A,
L = 4.7µH, COUT = 98µF, fSW = 300kHz
(DISCONTINUOUS CONDUCTION OPERATION)
FN8657.3
December 12, 2014
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