CS5165AGDWR16G ON Semiconductor, CS5165AGDWR16G Datasheet - Page 11

• Manufacturer Part Number: CS5165AGDWR16G
• Description: IC CTRLR BUCK SYNC 5BIT 16-SOIC
• Manufacturer: ON Semiconductor

Specifications of CS5165AGDWR16G

• Applications: Controller, Intel Pentium® II
• Voltage - Input: 8 ~ 14 V
• Number Of Outputs: 2
• Voltage - Output: 1.34 ~ 2.09 V, 2.14 ~ 3.54 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (0.300", 7.5mm Width)
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Short Circuit Protection
provided, requiring only the Soft−Start capacitor to implement.
If a short circuit condition occurs the V
the FAULT latch. This causes the top FET to shut off,
disconnecting the regulator from it’s input voltage. The
Soft−Start capacitor is then slowly discharged by a 2.0 mA
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 mA charge current.
will not achieve the 1.0 V low V
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 mA/60 mA = 3.3%),
while actual duty cycle is half that due to the extended off time
mode (1.65%).
components, input power supply, and PC board traces than
occurs with constant current limit protection (see Figures 18
and 19).
rise above the 1.0 V level, preventing the FAULT latch from
being set, allowing normal operation to resume.
Figure 17. Output Voltage Transient Response to a 14
A lossless hiccup mode short circuit protection feature is
If the short circuit condition persists, the regulator output
This protection feature results in less stress to the regulator
If the short circuit condition is removed, output voltage will
PROTECTION AND MONITORING FEATURES
A Load Turn−Off, V
Trace 1− GATE(H) (10 V/div.)
Trace 2− Inductor Switching Node (5.0 V/div.)
Trace 3− Load Current (5.0 A/div)
Trace 4− V
OUT
(100 mV/div.)
OUT
= +2.84 V (DAC = 10111)
FB
FB
comparator threshold
low comparator sets
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CS5165A
11
Overvoltage Protection
normal operation of the V
additional external components. The control loop responds to
an overvoltage condition within 100 ns, causing the top
MOSFET to shut off, disconnecting the regulator from it’s
input voltage. The bottom MOSFET is then activated, resulting
in a “crowbar” action to clamp the output voltage and prevent
damage to the load (see Figures 20 and 21 ). The regulator will
the Soft−Start Capacitor Charges, and Cease During
Figure 18. Demonstration Board Hiccup Mode Short
Circuit Protection. Gate Pulses are Delivered While
Overvoltage protection (OVP) is provided as result of the
Trace 4− 5.0 V from PC Power Supply (2.0 V/div.)
Trace 2− Inductor Switching Node (2.0 V/div.)
Trace 4− 5.0 V Supply Voltage (2.0 V/div.)
Trace 3− Soft−Start Timing Capacitor (1.0 V/div.)
Trace 2− Inductor Switching Node (2.0 V/div.)
Figure 19. Demonstration Board Startup with
Regulator Output Shorted To Ground
Discharge
2
M 25.0 ms
M 50.0 ms
control topology and requires no