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參數(shù)資料
| 型號： | RC5054AM |
| 廠商： | Fairchild Semiconductor Corporation |
| 文件頁數(shù)： | 2/13頁 |
| 文件大小： | 122K |
| 代理商： | RC5054AM |
RC5054A
PRODUCT SPECIFICATION
2
age-mode control with fast transient response. It includes a
200KHz free-running triangle-wave oscillator that is adjust-
able from 50KHz to 1MHz. The error amplifier features a
15MHz gain-bandwidth product and 6V/
enables high converter bandwidth for fast transient perfor-
mance. The resulting PWM duty ratio ranges from 0% to
100%.
μ
s slew rate which
The RC5054A monitors the output voltage with a window
comparator that tracks the DAC output and issues a Power
Good signal when the output is within
protects against over-current conditions by inhibiting PWM
operation. Built-in over-voltage protection triggers an exter-
nal SCR to crowbar the input supply. The RC5054A moni-
tors the current by using the R
DS(ON)
which eliminates the need for a current sensing resistor.
±
10%. The RC5054A
of the upper MOSFET
Pin Assignments
VSEN
OCSET
SS
VID0
VID1
VID2
VID4
VID3
COMP
FB
RT
VCC
LGATE
PGND
OVP
BOOT
UGATE
PHASE
PGOOD
GND
RC5054
(SOIC)
TOP VIEW
11
12
13
14
15
16
17
18
20
19
10
9
8
7
6
5
4
3
2
1
Pin Definitions
Pin Number Pin Names
1
Pin Function Description
This pin is connected to the converter’s output voltage. The PGOOD and OVP
comparator circuits use this signal to report output voltage status and for overvoltage
protection.
Connect a resistor (R
OCSET
) from this pin to the drain of the upper MOSFET.
R
OCSET
, an internal 200
μ
A current source (I
resistance (R
DS(ON)
) set the converter over-current (OC) trip point according to the
following equation:
VSEN
2
OCSET
OCS
), and the upper MOSFET on-
An over-current trip cycles the soft-start function.
Connect a capacitor from this pin to ground. This capacitor, along with an internal
10
μ
A current source, sets the soft-start interval of the converter.
VID0-4 are the input pins to the 5-bit DAC. The states of these five pins program the
internal voltage reference (DACOUT). The level of DACOUT sets the converter
output voltage. It also sets the PGOOD and OVP thresholds. Table 1 specifies
DACOUT for the 32 combinations of DAC inputs.
COMP and FB are the available external pins of the error amplifier. The FB pin is the
inverting input of the error amplifier and the COMP pin is the error amplifier output.
These pins are used to compensate the voltage-control feedback loop of the
converter.
Signal ground for the IC. All voltage levels are measured with respect to this pin.
PGOOD is an open collector output used to indicate the status of the converter
output voltage. This pin is pulled low when the converter output is not within
the DACOUT reference voltage.
Connect the PHASE pin to the upper MOSFET source. This pin is used to monitor
the voltage drop across the MOSFET for over-current protection. This pin also
provides the return path for the upper gate drive.
Connect UGATE to the upper MOSFET gate. This pin provides the gate drive for the
upper MOSFET.
This pin provides bias voltage to the upper MOSFET driver. A bootstrap circuit may
be used to create a BOOT voltage suitable to drive a standard N-Channel MOSFET.
This is the power ground connection. Tie the lower MOSFET source to this pin.
3
SS
4-8
VID0-VID4
9
10
COMP
FB
11
12
GND
PGOOD
±
10% of
13
PHASE
14
UGATE
15
BOOT
16
PGND
I
PEAK
I
-------R
R
DS ON
)
=
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