CS5307GDWR24 ON Semiconductor, CS5307GDWR24 Datasheet - Page 23

• Manufacturer Part Number: CS5307GDWR24
• Description: IC CTRLR BUCK 4PH VRM 9.0 24SOIC
• Manufacturer: ON Semiconductor
• Type: Step-Down (Buck)r

Specifications of CS5307GDWR24

• Internal Switch(s): No
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Frequency - Switching: 200kHz ~ 800kHz
• Voltage - Input: 4.5 ~ 14 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 24-SOIC (7.5mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Current - Output: -
• Voltage - Output: -
• Power - Output: -
• Other names: CS5307GDWR24OSTR

where:
current sense time constant (RC) should be slightly larger
than the R
a step load change will cause the sensed current waveform
to appear larger than the actual inductor current and will trip
the current limit at a lower level than expected.
10. PWM Comparator Input Voltage
comparator (see Figure 14 or 16) is limited by the internal
voltage supply of the controller (3.3 V), the size of the
internal ramp and the magnitude of the channel startup offset
voltage. To prevent the PWM comparator from saturating,
the differential input voltage from CS
3, or 4) must satisfy the following equation:
V CSREF,MAX ) V COx,MAX ) 600 mV @ D v 2.45 V
where:
Voltage Ripple Will Contribute to Output Voltage Jitter.
Ripple on the COMP Pin Should Be Less than 20 mV
V CSREF,MAX + Max VID Setting w AVP @ Full Load
V COn,MAX + [V CSx * V CSREF ] @ G CSA,MAX
R MAX + R SENSE or (R L,MAX ) R PCB,MAX )
I
R is either (R
G
For the overcurrent protection to work properly, the
The voltage at the positive input terminal of the PWM
Figure 31. At Full–Load the Peak–to–Peak Voltage
OUT,LIM
for a Well–Tuned/Stable Controller. Higher COMP
I
ILIM
Lo
V OCSET + (I OUT,LIM ) DI Lo 2) @ R @ G ILIM
/2 is half the inductor ripple current;
is the current sense to OCSET gain.
L
time constant. If the RC time constant is too fast,
is the current limit threshold of the converter;
+ (I O,MAX 2 ) DI Lo 2) @ R MAX
LMAX
@ G CSA,MAX
+ R
PCB
) or R
SENSE;
REF
to CSn (n = 1, 2,
http://onsemi.com
(34)
(35)
CS5307
23
11. Soft Start Time
where:
as the output does not begin to rise until V
voltage. As the internal and external ramp values are small,
the Soft Start time may be approximated by:
Overshoot and Monotonically Settles to Its Final Value.
Figure 32. The Value of C
V COMP + V OUT @ 0 A ) Channel_Startup_Offset
The Soft Start time (T
If C
The Channel_Startup_Offset is subtracted from V
Quickly Without Spiking or Ringing. V
T SS + C SS @ DV
SS
+ C SS @
= 0.1 F, then the Soft Start time will be:
+ 2.353 V dc (from page 12)
T SS + 0.1 mF @
) Int_Ramp ) G CSA @ Ext_Ramp 2
T SS + C SS @
I SS
V COMP * Channel_Startup_Offset
SS
) can be calculated from:
AMP
1.753 V dc
160 mA
V OUT @ 0 A
Is Optimal. COMP Slews
160 mA
I SS
+ 1.1 ms
COMP
OUT
Does Not
exceeds this
COMP
(36)
(37)
(38)