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參數(shù)資料
| 型號： | RT9228CS |
| 廠商： | Electronic Theatre Controls, Inc. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | ADVANCED PWM AND DUAL LINEAR POWER CONTROLLER |
| 中文描述： | 先進(jìn)的PWM和雙重線性電源控制器 |
| 文件頁數(shù)： | 5/10頁 |
| 文件大?。?/td> | 164K |
| 代理商： | RT9228CS |
RT9228
DS9228-03 July 2001
www.richtek.com
5
FB2 (Pin 11)
Connect this pin to a resistor divider to set the linear
regulator output voltage. VIN2 (Pin 12) this pin
supplies power to the internal regulator. Connect this
pin to a suitable 3.3V source.
Additionally, this pin is used to monitor the 3.3V
supply. If, following a startup cycle, the voltage drops
below 2.8V (typically), the chip shuts down. A new
soft-start cycle is initiated upon return of the 3.3V
supply above the under-voltage threshold.
VOUT2 (Pin 13)
Output of the linear regulator. Supplies current up to
230mA.
GND (Pin 14)
Signal ground for the IC. All voltage levels are
measured with respect to this pin.
GATE3 (Pin 15)
Connect this pin to drive gate of an external
MOSFET or NPN. This pin provides the drive for the
linear controller’s pass transistor.
FB3 (Pin 16)
Connect this pin to a resistor divider to set the linear
controller output voltage.
FB1 (Pin 18)
The FB1 pin is the inverting input of the error
amplifier.
VSEN1 (Pin 19)
This pin is connected to the PWM converter’s output
voltage. The PGOOD and OVP comparator circuits
use this signal to report output voltage status and for
over voltage protection.
OCSET1 (Pin 20)
Connect a resistor (R
OCSET1
) from this pin to the
drain of the upper MOSFET. R
OCSET
, an internal
200
μ
A current source (I
OCSET1
), and the upper
MOSFET on-resistance (R
DS(ON)
) set the PWM
converter over-current (OC) trip point according to
the following equation:
I
OCSET1
R
OCSET1
I
PEAK
=
R
DS (ON)
An over-current trip cycles the soft-start function.
Sustaining an over-current for 2 soft-start intervals
shuts down the controller.
PGND (Pin 21)
This is the power ground of UGATE1 and LGATE1.
Tie the PWM converter’s lower MOSFET source to
this pin.
LGATE1 (Pin 22)
Connect LGATE1 to the PWM converter’s lower
MOSFET gate. This pin provides the gate drive for
the lower MOSFET.
PHASE1 (Pin 23)
Connect the PHASE1 pin to the PWM converter’s
upper MOSFET source. This pin is used to monitor
the voltage drop across the upper MOSFET for over-
current protection.
UGATE1 (Pin 24)
Connect UGATE1 pin to the PWM converter’s upper
MOSFET gate. This pin provides the gate drive for
the upper MOSFET.
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