st1845rkg STMicroelectronics, st1845rkg Datasheet - Page 5

• Manufacturer Part Number: st1845rkg
• Description: Rad-tolerant Current Mode Pwm Controller
• Manufacturer: STMicroelectronics

ST1843 - ST1845
4
Pin connection
Figure 2.
Table 4.
No
1
2
3
4
5
6
7
8
GROUND This pin is the combined control circuitry and power ground.
Function
OUTPUT
COMP
I
R
SENSE
V
V
V
T
CC
FB
/C
ref
T
Pin connection
Pin functions
This pin is the error amplifier output and is made available for loop compensation.
This is the inverting input of the error amplifier. It is normally connected to the
switching power supply output through a resistor divider.
A voltage proportional to inductor current is connected to this input. The PWM uses
this information to terminate the output switch conduction.
The oscillator frequency and maximum output duty cycle are programmed by
connecting resistor RT to Vref and capacitor CT to ground. Operation to 500 kHz is
possible.
This output directly drives the gate of a power MOSFET. Peak currents up to 1A are
sourced and sunk by this pin.
This pin is the positive supply of the control IC.
This is the reference output. It provides charging current for capacitor CT through
resistor RT.
Doc ID 019049 Rev 1
Description
Pin connection
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