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参数资料
| 型号： | HIP6019BEVAL1 |
| 厂商： | Intersil |
| 文件页数： | 8/15页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD 1 FOR HIP6019B |
| 标准包装： | 1 |
| 系列： | * |
HIP6019B
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.
LUV
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
OVER
CURRENT
LATCH
INHIBIT
reported on the FAULT/RT pin.
OC1
S Q
FAULT
OC2
R
S
10V
REPORTED
0.15V
+
-
COUNTER
R
FAULT
LATCH
VCC
0V
COUNT
=1
COUNT
=2
COUNT
=3
SS
+
UP
S Q
4V
4V
-
OV
POR
R
FAULT
2V
0V
OVERLOAD
FIGURE 7. FAULT LOGIC - SIMPLIFIED SCHEMATIC
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-
0A
APPLIED
voltage comparator trips to set the fault latch and turns Q2
T0 T1
T2
T3
T4
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
8
TIME
FIGURE 8. OVER-CURRENT OPERATION
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.
FN4587.1
April 13, 2005
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PDF描述 |
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| HIP6021EVAL1 | EVALUATION BOARD HIP6021 |
| HIP6301EVAL2 | EVALUATION BOARD HIP6301 |
| HIP6302EVAL1 | EVALUATION BOARD HIP6302 |
| HIP6521EVAL1 | EVALUATION BOARD HIP6521 |
| HIP6602BCR-T | IC DRVR MOSF 2CH SYC BUCK 16-QFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| HIP6019CB | 制造商:Harris Corporation 功能描述: |
| HIP6019CB-T | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| HIP6019EVAL1 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Advanced Dual PWM and Dual Linear Power Control |
| HIP6020 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Advanced Dual PWM and Dual Linear Power Controller |
| HIP6020A | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Advanced Dual PWM and Dual Linear Power Controller |
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