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參數資料
| 型號： | HIP6019CB |
| 廠商： | HARRIS SEMICONDUCTOR |
| 元件分類： | 穩壓器 |
| 英文描述： | Advanced Dual PWM and Dual Linear Power Control |
| 中文描述： | DUAL SWITCHING CONTROLLER, 215 kHz SWITCHING FREQ-MAX, PDSO28 |
| 文件頁數： | 8/15頁 |
| 文件大小： | 152K |
| 代理商： | HIP6019CB |
2-259
immediately sets the fault latch. A sequence of three over-
current fault signals also sets the fault latch. A comparator
indicates when C
SS
is fully charged (UP signal), such that an
under-voltage event on either linear output (FB3 or FB4) is
ignored until after the soft-start interval (approximately T3 in
Figure 6). At start-up, this allows V
OUT3
and V
OUT4
to slew
up over increased time intervals, without generating a fault.
Cycling the bias input voltage (+12V
IN
on the VCC pin) off
then on resets the counter and the fault latch.
Over-Voltage Protection
During operation, a short on the upper MOSFET (Q1)
causes V
OUT1
to increase. When the output exceeds the
over-voltage threshold of 115% of DACOUT, the over-voltage
comparator trips to set the fault latch and turns Q2 on as
required in order to regulate V
OUT1
to 1.15 x DACOUT. This
blows the input fuse and reduces V
OUT1
. The fault latch
raises the FAULT/RT pin close to VCC potential.
A separate over-voltage circuit provides protection during
the initial application of power. For voltages on the VCC pin
below the power-on reset (and above ~4V), V
OUT1
is
monitored for voltages exceeding 1.26V. Should VSEN1
exceed this level, the lower MOSFET (Q2) is driven on, as
needed to regulate V
OUT1
to 1.26V.
Over-Current Protection
All outputs are protected against excessive over-currents.
Both PWM controllers use the upper MOSFET’s
on-resistance, r
DS(ON)
to monitor the current for protection
against shorted outputs. The linear regulator monitors the
current of the integrated power device and signals an over-
current condition for currents in excess of 230mA.
Additionally, both the linear regulator and the linear
controller monitor FB3 and FB4 for under-voltage to protect
against excessive currents.
Figures 8 and 9 illustrate the over-current protection with an
overload on OUT2. The overload is applied at T0 and the
current increases through the output inductor (L
OUT2
). At time
T1, the OVER-CURRENT2 comparator trips when the voltage
across Q3 (I
D
r
DS(ON)
) exceeds the level programmed by
R
OCSET
. This inhibits all outputs, discharges the soft-start
capacitor (C
SS
) with a 11
μ
A current sink, and increments the
counter. C
SS
recharges at T2 and initiates a soft-start cycle
with the error amplifiers clamped by soft-start. With OUT2 still
overloaded, the inductor current increases to trip the over-
current comparator. Again, this inhibits all outputs, but the
soft-start voltage continues increasing to 4V before
discharging. The counter increments to 2. The soft-start cycle
repeats at T3 and trips the over-current comparator. The SS
pin voltage increases to 4V at T4 and the counter increments to
3. This sets the fault latch to disable the converter. The fault is
reported on the FAULT/RT pin.
The PWM1 controller and the linear regulator operate in the
same way as PWM2 to over-current faults. Additionally, the
linear regulator and linear controller monitor the feedback
pins for an under-voltage. Should excessive currents cause
FB3 or FB4 to fall below the linear under-voltage threshold,
the LUV signal sets the over-current latch if C
SS
is fully
charged. Blanking the LUV signal during the C
SS
charge
interval allows the linear outputs to build above the under-
voltage threshold during normal start-up. Cycling the bias
input power off then on resets the counter and the fault
latch
.
FAULT
LATCH
S
R
Q
POR
COUNTER
OC1
OV
OC2
LUV
+
-
+
-
0.15V
4V
SS
VCC
FAULT
R
FIGURE 7. FAULT LOGIC - SIMPLIFIED SCHEMATIC
UP
OVER
CURRENT
LATCH
INHIBIT
S
R
Q
S
S
0A
0V
2V
4V
FIGURE 8. OVER-CURRENT OPERATION
TIME
T1
T2
T3
T0
T4
F
0V
10V
FAULT
REPORTED
COUNT
= 1
COUNT
= 2
COUNT
= 3
OVERLOAD
APPLIED
HIP6019
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相關代理商/技術參數 |
參數描述 |
|---|---|
| HIP6019CB-T | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| HIP6019EVAL1 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Advanced Dual PWM and Dual Linear Power Control |
| HIP6020 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Advanced Dual PWM and Dual Linear Power Controller |
| HIP6020A | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Advanced Dual PWM and Dual Linear Power Controller |
| HIP6020A_01 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Advanced Dual PWM and Dual Linear Power Controller |
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