L6590D STMicroelectronics, L6590D Datasheet - Page 18

• Manufacturer Part Number: L6590D
• Description: IC SWIT OVP OCP 16SOIC
• Manufacturer: STMicroelectronics

Specifications of L6590D

• Output Isolation: Isolated
• Frequency Range: 52 ~ 74kHz
• Voltage - Input: 6.5 ~ 18 V
• Voltage - Output: 700V
• Power (watts): 15W
• Operating Temperature: -40°C ~ 150°C
• Package / Case: 16-SOIC (0.300", 7.50mm Width)
• Operating Temperature Range: - 40 C to + 150 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

L6590
At turn-on, there are large current spikes due to the discharge of parasitic capacitances and, in case of Contin-
uos Conduction Mode operation, to secondary diode reverse recovery as well, which could falsely trigger the
OCP comparator. To increase noise immunity the output of the OCP comparator is blanked for a short time
(about 120 ns) just after the MOSFET is turned on, so that any disturbance within this time slot is rejected (Lead-
ing Edge Blanking).
Figure 37. OCP internal schematic
Thermal Shutdown
Overheating of the device due to an excessive power throughput or insufficient heatsinking is avoided by the
Thermal Shutdown function. A thermal sensor monitors the junction temperature close to the power MOSFET
and, when the temperature exceeds 150 °C (min.), sets an alarm signal that stops the operation of the device.
This is a not-latched function and the power MOSFET is re-enabled as the temperature falls about 40 °C.
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OSCILLATOR
+
-
PWM
Clock
Clock
Max. Duty cycle
S
R
Q
LEB
OCP
+
-
Driver
0.5 V
Rsense
1/100
DRAIN
GND
1