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参数资料
| 型号： | ISL6430 |
| 厂商： | Intersil Corporation |
| 英文描述： | Single Sync Buck PWM Controller for Broadband Gateway Applications |
| 中文描述： | 单同步降压PWM控制器，宽带网关应用 |
| 文件页数： | 7/12页 |
| 文件大小： | 400K |
| 代理商： | ISL6430 |
4
Functional Pin Description
RT
This pin provides oscillator switching frequency adjustment.
By placing a resistor (RT) from this pin to GND, the nominal
200kHz switching frequency is increased according to the
following equation:
Conversely, connecting a pull-up resistor (RT) from this pin
to VCC reduces the switching frequency according to the
following equation.:
OCSET
Connect a resistor (ROCSET) from this pin to the drain of the
upper MOSFET. ROCSET, an internal 200A current source
(IOCS), and the upper MOSFET on-resistance (rDS(ON)) set
the converter over-current (OC) trip point according to the
following equation:
An over-current trip cycles the soft-start function.
SS
Connect a capacitor from this pin to ground. This capacitor,
along with an internal 10
A current source, sets the soft-
start interval of the converter.
COMP and FB
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.
EN
This pin is the open-collector enable pin. Pull this pin below
1V to disable the converter. In shutdown, the soft start pin is
discharged and the UGATE and LGATE pins are held low.
GND
Signal ground for the IC. All voltage levels are measured
with respect to this pin.
PHASE
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.
UGATE
Connect UGATE to the upper MOSFET gate. This pin
provides the gate drive for the upper MOSFET.
BOOT
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.
PGND
This is the power ground connection. Tie the lower MOSFET
source to this pin.
LGATE
Connect LGATE to the lower MOSFET gate. This pin
provides the gate drive for the lower MOSFET.
PVCC
Provide a bias supply for the lower gate drive to this pin.
VCC
Provide a 12V bias supply for the chip to this pin.
Typical Performance Curves
FIGURE 1. RT RESISTANCE vs FREQUENCY
FIGURE 2. BIAS SUPPLY CURRENT vs FREQUENCY
10
100
1000
SWITCHING FREQUENCY (kHz)
R
E
SIST
ANCE
(k
)
10
100
1000
RT PULLUP
TO +12V
RT PULLDOWN
TO VSS
100
200
300
400
500
600
700
800
900
1000
80
70
60
50
40
30
20
10
0
I VCC
(mA)
SWITCHING FREQUENCY (kHz)
CGATE = 1000pF
CGATE = 3300pF
CGATE = 10pF
Fs
200kHz
510
6
R
T k
()
---------------------
+
≈
(RT to GND)
Fs
200kHz
410
7
R
T k
()
---------------------
–
≈
(RT to 12V)
I
PEAK
I
OCS
R
OCSET
r
DS ON
()
--------------------------------------------
=
ISL6430
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