CS52845(1997) View Datasheet(PDF) - Cherry semiconductor
Part Name
Description
View to exact match
CS52845 Datasheet PDF : 6 Pages
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Electrical Characteristics: Unless otherwise stated, specifications apply for -40 ² TA ² 85ûC; VCC = 15V (Note 1); RT = 10k½;
CT = 3.3nF for sawtooth mode.
PARAMETER
s Total Standby Current
Start-Up Current
Operating Supply Current
VCC Zener Voltage
TEST CONDITIONS
VFB=VSense=0V RT=10k½, CT=3.3nF
ICC=25mA
MIN
TYP
0.5
11
34
MAX
1.0
17
UNIT
mA
mA
V
s PWM Section
Maximum Duty Cycle
Minimum Duty Cycle
s Undervoltage Lockout Section
Start Threshold
Min. Operating Voltage
After Turn On
46
48
50
%
0
%
7.8
8.4
9.0
V
7.0
7.6
8.2
V
Notes:
1. Adjust Vcc above the start threshold before setting at 15V.
2.These parameters, although guaranteed, are not 100% tested in production.
3. Parameter measured at trip point of latch with VFB=0.
4. Gain defined as: A =
ÆVCOMP
ÆVSense
; 0 ² VSense ² 0.8V.
PACKAGE PIN #
8L
14L
SO Narrow SO Narrow
1
1
2
3
3
5
4
7
5
9
5
8
6
10
7
11
7
12
8
14
2,4,6,13
Package Pin Description
PIN SYMBOL
FUNCTION
COMP
VFB
Sense
OSC
Gnd
Pwr Gnd
VOUT
VCCPwr
VCC
VREF
NC
Error amp output, used to compensate error amplifier.
Error amp inverting input.
Noninverting input to Current Sense Comparator.
Oscillator timing network with Capacitor to Ground, resistor to VREF.
Ground.
Output driver Ground.
Output drive pin.
Output driver positive supply.
Positive power supply.
Output of 5V internal reference.
No Connection.
3
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