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CS5155 データシート(PDF) 4 Page - Cherry Semiconductor Corporation

部品番号 CS5155
部品情報  CPU 5-Bit Synchronous Buck Controller
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メーカー  CHERRY [Cherry Semiconductor Corporation]
ホームページ  http://www.cherrycorp.com/
Logo CHERRY - Cherry Semiconductor Corporation

CS5155 データシート(HTML) 4 Page - Cherry Semiconductor Corporation

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PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
4
Package Pin Description
PACKAGE PIN #
PIN SYMBOL
FUNCTION
16L SO Narrow & PDIP
1,2,3,4,6
VID0 Ð VID4
Voltage ID DAC input pins. These pins are internally pulled up to 5V
providing logic ones if left open. VID4 selects the DAC range. When VID4
is High (logic one), the DAC range is 2.14V to 3.54V with 100mV incre-
ments. When VID4 is Low (logic zero), the DAC range is 1.34V to 2.09V
with 50mV increments. VID0 - VID4 select the desired DAC output volt-
age. Leaving all 5 DAC input pins open results in a DAC output voltage
of 1.244V, allowing for adjustable output voltage, using a traditional
resistor divider.
5
SS
Soft Start Pin. A capacitor from this pin to LGnd in conjunction with
internal 60µA current source provides soft start function for the con-
troller. This pin disables fault detect function during Soft Start. When a
fault is detected, the soft start capacitor is slowly discharged by internal
2µA current source setting the time out before trying to restart the IC.
Charge/discharge current ratio of 30 sets the duty cycle for the IC when
the regulator output is shorted.
s Soft Start (SS)
Charge Time
1.6
3.3
5.0
ms
Pulse Period
25
100
200
ms
Duty Cycle
(Charge Time/Pulse Period)
´ 100
1.0
3.3
6.0
%
COMP Clamp Voltage
VFB = 0V; VSS = 0
0.50
0.95
1.10
V
VFFB SS Fault Disable
VGATE(H) = Low; VGATE(L) = Low
0.9
1.0
1.1
V
High Threshold
2.5
3.0
V
s PWM Comparator
Transient Response
VFFB = 0 to 5V to VGATE(H) = 9V to 1V;
100
125
ns
VCC1 = VCC2 = 12V
VFFB Bias Current
VFFB = 0V
0.3
µA
s Supply Current
ICC1
No Switching
8.5
13.5
mA
ICC2
No Switching
1.6
3.0
mA
Operating ICC1
VFB = COMP = VFFB
813
mA
Operating ICC2
VFB = COMP = VFFB
25
mA
s COFF
Normal Charge Time
VFFB = 1.5V; VSS = 5V
1.0
1.6
2.2
µs
Extension Charge Time
VSS = VFFB = 0
5.0
8.0
11.0
µs
Discharge Current
COFF to 5V; VFB >1V
5.0
mA
s Time Out Timer
Time Out Time
VFB = VCOMP; VFFB = 2V;
10
30
50
µs
Record VGATE(H) Pulse High Duration
Fault Mode Duty Cycle
VFFB = 0V
35
50
65
%
Note 1: Guaranteed by design, not 100% tested in production.
Electrical Characteristics: 0¡C < TA < +70¡C; 0¡C < TJ < +85¡C; 8V < VCC1 < 14V; 5V < VCC2 < 20V;
DAC Code: VID4 = VID2 = VID1 = VID0 = 1; VID3 = 0; CVGATE(L) and CVGATE(H) = 1nF; COFF = 330pF; CSS = 0.1µF, unless otherwise specified.


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