E-L5973ADTR STMicroelectronics, E-L5973ADTR Datasheet - Page 7

• Manufacturer Part Number: E-L5973ADTR
• Description: Switching Converters, Regulators & Controllers 1.235 to 35V Step-Dn
• Manufacturer: STMicroelectronics

Specifications of E-L5973ADTR

• Output Voltage: 35 V
• Mounting Style: SMD/SMT
• Package / Case: HSOP-8
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

L5973AD
4
Functional description
The main internal blocks are shown in
They are:
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Figure 3.
A voltage regulator that supplies the internal circuitry. From this regulator, a 3.3 V
reference voltage is externally available.
A voltage monitor circuit that checks the input and internal voltages.
A fully integrated sawtooth oscillator whose frequency is 500 kHz
Two embedded current limitations circuitries which control the current that flows
through the power switch. The Pulse by Pulse Current Limit forces the power switch
OFF cycle by cycle if the current reaches an internal threshold, while the Frequency
Shifter reduces the switching frequency in order to strongly reduce the duty cycle.
A transconductance error amplifier.
A pulse width modulator (PWM) comparator and the relative logic circuitry necessary to
drive the internal power.
An high side driver for the internal P-MOS switch.
An inhibit block for stand-by operation.
A circuit to realize the thermal protection function.
Block diagram
Doc ID 9552 Rev 9
Figure
3, where is reported the device block diagram.
Functional description
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