The maximum recommended average power safe
operating area (SOA) at each Vin is determined by the lower value of the 1.5W 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
Section 9.5.2 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 9V to 18V. 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 7-2 SOA
Derating Curves: VVDD-VEE = 15 V, VCOM-VEE = 5 V,
Tshut=160oC, No Load on
VCOM-VEE Figure 7-4 SOA
Derating Curves: VVDD-VEE = 22 V, VCOM-VEE = 4 V,
Tshut=160oC, No Load on
VCOM-VEE Figure 7-6 SOA Derating Curves:
VVDD-VEE = 22 V, VCOM-VEE = 4 V,
Tshut=150oC, No Load on VCOM-VEE,
tested in a shielded box. Figure 7-8 Shutdown: VIN = 12 V, VVDD-VEE = 22 V,
VCOM-VEE = 4 V, No Load on VCOM-VEE. Voltage
Scale: 5V/div, Time Scale: 50ms/div. Figure 7-10 VVDD-VEE Load Regulation: VIN = 9 V,
VVDD-VEE = 22 V, VCOM-VEE = 4 V Figure 7-12 VVDD-VEE Load Regulation: VIN = 18 V,
VVDD-VEE = 22 V, VCOM-VEE = 4 V Figure 7-14 VCOM-VEE Load Regulation: VIN = 12 V,
VVDD-VEE = 22 V, VCOM-VEE = 4 V Figure 7-16 Efficiency vs. Load on VVDD-VEE: VIN = 9 V,
VVDD-VEE = 22 V, VCOM-VEE = 4 V, No Load on
VCOM-VEE Figure 7-18 Efficiency vs. Load on VVDD-VEE: VIN = 18 V,
VVDD-VEE = 22 V, VCOM-VEE = 4 V, No Load on
VCOM-VEE Figure 7-20 Input
Current vs. Load on VVDD-VEE: VIN = 12 V,
VVDD-VEE = 22 V, VCOM-VEE = 4 V, No Load on
VCOM-VEE Figure 7-3 SOA
Derating Curves: VVDD-VEE = 18 V, VCOM-VEE = 3 V,
Tshut=160oC, No Load on
VCOM-VEE Figure 7-5 SOA Derating Curves:
VVDD-VEE = 25 V, VCOM-VEE = 5 V,
Tshut=160oC, No Load on
VCOM-VEE Figure 7-7 Start-up: VIN = 12 V, VVDD-VEE = 22 V,
VCOM-VEE = 4 V, No Load on VCOM-VEE. Voltage
Scale: 5V/div, Time Scale: 2ms/div. Figure 7-9 Load
Transient Response: Between No Load and 1.5W, VIN = 12 V,
VVDD-VEE = 22 V, VCOM-VEE = 4 V Figure 7-11 VVDD-VEE Load Regulation: VIN = 12 V,
VVDD-VEE = 22 V, VCOM-VEE = 4 V Figure 7-13 VCOM-VEE Load Regulation: VIN = 9 V,
VVDD-VEE = 22 V, VCOM-VEE = 4 V Figure 7-15 VCOM-VEE Load Regulation: VIN = 18 V,
VVDD-VEE = 22 V, VCOM-VEE = 4 V Figure 7-17 Efficiency vs. Load on VVDD-VEE: VIN = 12 V,
VVDD-VEE = 22 V, VCOM-VEE = 4 V, No Load on
VCOM-VEE Figure 7-19 Input
Current vs. Load on VVDD-VEE: VIN = 9 V,
VVDD-VEE = 22 V, VCOM-VEE = 4 V, No Load on
VCOM-VEE Figure 7-21 Input
Current vs. Load on VVDD-VEE: VIN = 18 V,
VVDD-VEE = 22 V, VCOM-VEE = 4 V, No Load on
VCOM-VEE