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參數(shù)資料
| 型號： | CS5159GD16 |
| 英文描述： | Analog IC |
| 中文描述： | 模擬IC |
| 文件頁數(shù)： | 2/16頁 |
| 文件大?。?/td> | 197K |
| 代理商： | CS5159GD16 |
CS5151H
http://onsemi.com
10
Figure 11. CS5151H Demonstration Board Response to
13 A Load Turn Off (Output Set for 2.8 V). V2 Control
Topology Immediately Connects Inductor to Ground,
Providing 0% Duty Cycle. Regulation is Achieved in
Less Than 10
ms
Trace 3– Output Current (13 to 0,5 Amps) (20 mV/div.)
Trace 2– Inductor Switching Node (5.0 V/div.)
Trace 1– Regulator Output Voltage (1.0 V/div.)
PROTECTION AND MONITORING FEATURES
VCC1 Monitor
To
maintain
predictable
startup
and
shutdown
characteristics an internal VCC1 monitor circuit is used to
prevent the part from operating below 3.75 V minimum
startup. The VCC1 monitor comparator provides hysteresis
and guarantees a 3.70 V minimum shutdown threshold.
Short Circuit Protection
A lossless hiccup mode short circuit protection feature is
provided, requiring only the Soft Start capacitor to
implement. If a short circuit condition occurs (VFFB < 1.0 V),
the VFFB low comparator sets the FAULT latch. This causes
the MOSFET to shut off, disconnecting the regulator from
it’s input voltage. The Soft Start capacitor is then slowly
discharged by a 2.0
A current source until it reaches it’s
lower 0.7 V threshold. The regulator will then attempt to
restart normally, operating in it’s extended off time mode
with a 50% duty cycle, while the Soft Start capacitor is
charged with a 60
A charge current.
If the short circuit condition persists, the regulator output
will not achieve the 1.0 V low VFFB comparator threshold
before the Soft Start capacitor is charged to it’s upper 2.5 V
threshold. If this happens the cycle will repeat itself until the
short is removed. The Soft Start charge/discharge current
ratio sets the duty cycle for the pulses (2.0
A/60 A =
3.3%), while actual duty cycle is half that due to the
extended off time mode (1.65%).
This protection feature results in less stress to the
regulator components, input power supply, and PC board
traces than occurs with constant current limit protection (see
Figures 12 and 13).
If the short circuit condition is removed, output voltage
will rise above the 1.0 V level, preventing the FAULT latch
from being set, allowing normal operation to resume.
Figure 12. CS5151H Demonstration Board Hiccup
Mode Short Circuit Protection. Gate Pulses are
Delivered While the Soft Start Capacitor Charges, and
Cease During Discharge
M 25.0 ms
Trace 3– Soft Start Timing Capacitor (1.0 V/div.)
Trace 4– 5.0 V Supply Voltage (2.0 V/div.)
Trace 2– Inductor Switching Node (2.0 V/div.)
Figure 13. Startup with Regulator Output Shorted
M 50.0
s
Trace 4– 5.0 V from PC Power Supply (2.0 V/div.)
Trace 2– Inductor Switching Node (2.0 V/div.)
Overvoltage Protection
Overvoltage protection (OVP) is provided as result of the
normal operation of the V2 control topology and requires no
additional external components. The control loop responds
to an overvoltage condition within 100 ns, causing the
MOSFET to shut off, disconnecting the regulator from it’s
input voltage.
External Output Enable Circuit
On/off control of the regulator can be implemented
through two additional discrete components (see Figure 14).
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