The maximum recommended average power safe operating area (SOA) at each Vin is
determined by the lower value of the 2W limit (dotted line) and the corresponding
thermal derating curve (solid line) at that input voltage. It is not recommended to
operate at an ambient temperature higher than 125
oC. The thermal derating
power is acquired with an evaluation board similar to the EVM shown in the
Application and Implementation section. T
shut represents the primary-side
over-temperature shutdown rising threshold. As shown in the Electrical
Characteristics table, the typical T
shut value is 150
oC, and
minimal T
shut value is 140
oC. The SOA derating curve with both
T
shut = 150
oC and 140
oC are provided below. The
SOA curves under four common VDD-VEE settings, 15V, 18V, 22V, and 25V are
characterized. In each SOA curve, the input voltage is swept from 21V to 27V. To
represent a worst-case condition with T
shut = 140
oC, the test
is done in a shieded box to block circulating air in the thermal chamber.
Figure 10-1 SOA
Derating Curves: VVDD-VEE = 15 V, VCOM-VEE = 5 V,
Tshut=150oC, No Load on
VCOM-VEE. Figure 10-3 SOA
Derating Curves: VVDD-VEE = 22 V, VCOM-VEE = 4 V,
Tshut=150oC, No Load on
VCOM-VEE. Figure 10-5 SOA
Derating Curves: VVDD-VEE = 22 V, VCOM-VEE = 4 V,
Tshut=140oC, , No Load on VCOM-VEE,
tested in a shielded box. Figure 10-2 SOA
Derating Curves: VVDD-VEE = 18 V, VCOM-VEE = 5 V,
Tshut=150oC, No Load on
VCOM-VEE. Figure 10-4 SOA
Derating Curves: VVDD-VEE = 25 V, VCOM-VEE = 5 V,
Tshut=150oC, No Load on
VCOM-VEE.
Figure 10-6 Start-up: VIN = 24 V, VVDD-VEE = 25 V, VCOM-VEE = 5
V, No Load Figure 10-8 Load
Transient Response: No Load to 1 W, VIN = 24 V, VVDD-VEE = 25 V,
VCOM-VEE = 5 V Figure 10-10 VVDD-VEE Load Regulation: VIN = 21 V, VVDD-VEE =
22 V, VCOM-VEE = 4 V Figure 10-12 VVDD-VEE Load Regulation: VIN = 27 V, VVDD-VEE =
22 V, VCOM-VEE = 4 V Figure 10-14 VCOM-VEE Load Regulation: VIN = 24 V, VVDD-VEE =
22 V, VCOM-VEE = 4 V Figure 10-16 Efficiency vs Load on VVDD-VEE: VIN = 21 V, VVDD-VEE
= 22 V, VCOM-VEE = 4 V, No Load on VCOM-VEE Figure 10-18 Efficiency vs Load on VVDD-VEE: VIN = 27 V, VVDD-VEE
= 22 V, VCOM-VEE = 4 V, No Load on VCOM-VEE Figure 10-20 Input
Current vs Load on VVDD-VEE: VIN = 24 V, VVDD-VEE = 22
V, VCOM-VEE = 4 V, No Load on VCOM-VEE Figure 10-7 Shutdown: VIN = 24 V, VVDD-VEE = 25 V, VCOM-VEE = 5
V, No Load Figure 10-9 Load
Transient Response: 1 W to No Load, VIN = 24 V, VVDD-VEE = 25 V,
VCOM-VEE = 5 V Figure 10-11 VVDD-VEE Load Regulation: VIN = 24 V, VVDD-VEE =
22 V, VCOM-VEE = 4 V Figure 10-13 VCOM-VEE Load Regulation: VIN = 21 V, VVDD-VEE =
22 V, VCOM-VEE = 4 V Figure 10-15 VCOM-VEE Load Regulation: VIN = 27 V, VVDD-VEE =
22 V, VCOM-VEE = 4 V Figure 10-17 Efficiency vs Load on VVDD-VEE: VIN = 24 V, VVDD-VEE
= 22 V, VCOM-VEE = 4 V, No Load on VCOM-VEE Figure 10-19 Input
Current vs Load on VVDD-VEE: VIN = 21 V, VVDD-VEE = 22
V, VCOM-VEE = 4 V, No Load on VCOM-VEE Figure 10-21 Input
Current vs Load on VVDD-VEE: VIN = 27 V, VVDD-VEE = 22
V, VCOM-VEE = 4 V, No Load on VCOM-VEE