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參數(shù)資料
| 型號(hào)： | ISL6567CRZ-T |
| 廠商： | INTERSIL CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Multipurpose Two-Phase Buck PWM Controller with Integrated MOSFET Drivers |
| 中文描述： | SWITCHING CONTROLLER, 2000 kHz SWITCHING FREQ-MAX, PQCC24 |
| 封裝： | 4 X 4 MM, ROHS COMPLIANT, PLASTIC, MO-220VGGD-2, QFN-24 |
| 文件頁數(shù)： | 12/26頁 |
| 文件大?。?/td> | 659K |
| 代理商： | ISL6567CRZ-T |
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12
OVERCURRENT PROTECTION
The individual channel currents, as sensed via the PHASE
pins and scaled via the ISEN resistors, as well as their
combined average are continuously monitored and
compared with an internal overcurrent (OC) reference. If the
combined channel current average exceeds the reference
current, the overcurrent comparator triggers an overcurrent
event. Similarly, an OC event is also triggered if either
channel’s current exceeds the OC reference for 7
consecutive switching cycles.
As a result of an OC event, output drives turn off both upper
and lower MOSFETs, and the SS capacitor is discharged via
a 20
μ
A current source. The behavior following this standard
response varies depending whether the controller is
operating in internal (using internal reference; MON > 3.5V)
or external reference mode (using external reference; MON
< 3.5V). As shown in Figure 6, the soft-start capacitor
discharge prompted by the OC event is followed by two SS
cycles, during which the ISL6567 stays off. Following the
dormant SS cycles, the controller attempts to re-establish
the output. Should the OC condition been removed, the
output voltage is ramped up and operation resumes as
normal. Should the OC condition still be present and result in
another OC event, the entire behavior repeats until the OC
condition is removed or the IC is disabled. Figure 7 details
the OC behavior while in external reference mode. Following
the OC event, the output drives are turned off, the ISL6567
latches off, and the SS capacitor is discharged to ground.
Resetting the OC latch involves removal of bias power or
cycling of the EN pin (pictured in Figure 7). Should the OC
event been removed, the controller initiates a new SS cycle
and restores the output voltage.
SETTING THE OUTPUT VOLTAGE
The ISL6567 uses a precision internal reference voltage to
set the output voltage. Based on this internal reference, the
output voltage can thus be set from 0.6V up to a level deter-
mined by the input voltage, the maximum duty cycle, and the
conversion efficiency of the circuit; the following equation
estimates this maximum amplitude the output voltage can be
regulated to. Obviously, insure that the input voltage and all
the voltages sampled by the ISL6567 do not exceed the con-
troller’s absolute maximum limits, or any other limits specified
in this document.
OUTPUT CURRENT
FIGURE 6. OVERCURRENT BEHAVIOR WHILE IN INTERNAL
REFERENCE MODE
OUTPUT VOLTAGE
SS
EN
GND>
GND>
OUTPUT CURRENT
FIGURE 7. OVERCURRENT BEHAVIOR WHILE IN EXTERNAL
REFERENCE MODE
OUTPUT VOLTAGE
SS
EN
GND>
GND>
V
OUTMAX
d
MAX
V
IN
Efficiency
=
FIGURE 8. SETTING THE OUTPUT VOLTAGE AT THE INPUT
OF THE DIFFERENTIAL AMPLIFIER
-
+
EXTERNAL CIRCUIT
ISL6567
VSEN
RGND
VDIFF
R
S
R
P
DIFFERENTIAL
AMPLIFIER
X1
FB
-
+
To V
OUT
+
-
V
REF
ERROR
AMPLIFIER
R
1
ISL6567
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