VIPER53 データシートの表示（PDF） - STMicroelectronics
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VIPER53 Datasheet PDF : 24 Pages
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VIPer53DIP / VIPer53SP
PIN FUNCTION
Name
Function
Power supply of the control circuits. Also provides the charging current of the external capacitor during
start-up. The functions of this pin are managed by four threshold voltages:
VDD
- VDDon: Voltage value at which the device starts switching (Typically 11.5 V).
- VDDoff: Voltage value at which the device stops switching (Typically 8.4 V).
- VDDreg: Regulation voltage point when working in primary feedback (Trimmed to 15 V).
- VDDovp: Triggering voltage of the overvoltage protection (Trimmed to 18 V).
SOURCE Power Mosfet source and circuit ground reference.
Power Mosfet drain. Also used by the internal high voltage current source during the start-up phase, for
DRAIN charging the external VDD capacitor.
COMP
Input of the current mode structure, and output of the internal error amplifier. Allows the setting of the
dynamic characteristic of the converter through an external passive network. Useful voltage range
extends from 0.5 V to 4.5 V. The Power Mosfet is always off below 0.5 V, and the overload protection is
triggered if the voltage exceeds 4.35V. This action is delayed by the timing capacitor connected to the
TOVL pin.
TOVL
Allows the connection of an external capacitor for delaying the overload protection, which is triggered by
a voltage on the COMP pin higher than 4.35V.
OSC Allows the setting of the switching frequency through an external Rt-Ct network.
CURRENT AND VOLTAGE CONVENTIONS
IDD
ID
VDD
DRAIN
IOSC
OSC
15V
VDS
VDD
TOVL
COMP SOURCE
VOSC
ITOVL
VTOVL
ICOMP
VCOMP
CONNECTION DIAGRAM
COMP 1
OSC 2
SOURCE 3
SOURCE 4
8 TOVL
7 VDD
6 NC
5 DRAIN
DIP-8
ORDER CODES
PACKAGE
DIP-8
PowerSO-10™
DRAIN
NC
1
NC
2
NC
3
VDD
4
TOVL
5
10
SOURCE
9
NC
8
NC
7
OSC
6
COMP
TUBE
VIPer53DIP
VIPer53SP
PowerSO-10™
TAPE and REEL
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VIPer53SP13TR
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