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参数资料
| 型号： | L6590N |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 0.7 A SWITCHING REGULATOR, 74 kHz SWITCHING FREQ-MAX, PDIP8 |
| 封装： | MINI, DIP-8 |
| 文件页数： | 10/23页 |
| 文件大小： | 383K |
| 代理商： | L6590N |
Obsolete
Product(s)
- Obsolete
Product(s)
L6590
18/23
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.
Clock
+
-
DRAIN
GND
1
1/100
S
R
Q
Max. Duty cycle
OSCILLATOR
PWM
Driver
Rsense
OCP
+
-
0.5 V
LEB
Clock
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