The maximum recommended average power
safe operating area (SOA) at each Vin is determined by the lower value of the 2.5 W
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 160
oC, and minimal T
shut value
is 150
oC. The SOA derating curve with both T
shut =
160
oC and 150
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 = 150
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=160oC, No Load on
VCOM-VEE. Figure 10-3 SOA
Derating Curves: VVDD-VEE = 22 V, VCOM-VEE = 4 V,
Tshut=160oC, No Load on
VCOM-VEE. Figure 10-5 SOA
Derating Curves: VVDD-VEE = 22 V, VCOM-VEE = 4 V,
Tshut=150oC, , 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=160oC, No Load on
VCOM-VEE. Figure 10-4 SOA
Derating Curves: VVDD-VEE = 25 V, VCOM-VEE = 5 V,
Tshut=160oC, 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