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UC3842 Datasheet(PDF) 4 Page - NXP Semiconductors

Part No. UC3842
Description  Current-mode PWM controller
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Maker  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

UC3842 Datasheet(HTML) 4 Page - NXP Semiconductors

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Philips Semiconductors Linear Products
Product specification
UC3842
Current-mode PWM controller
August 31, 1994
1103
DC AND AC ELECTRICAL CHARACTERISTICS
0
≤TJ≤70°C for UC3842; VCC=154; RT=10kΩ; CT=3.3nF, unless otherwise specified
SYMBOL
PARAMETER
TEST CONDITIONS
UC3842
UNIT
SYMBOL
PARAMETER
TEST CONDITIONS
Min
Typ
Max
UNIT
Output section
VOL
Output Low-Level
ISINK=20mA
0.1
0.4
V
VOL
Output Low-Level
ISINK=200mA
1.5
2.2
V
VOH
Output High-Level
ISOURCE=20mA
13
13.5
V
VOH
Output High-Level
ISOURCE=200mA
12
13.5
V
tR
Rise time
CL=1nF
50
150
ns
tF
Fall time
CL=1nF
50
150
ns
Undervoltage lockout section
Start threshold
14.5
16
17.5
V
Min. operating voltage after turn on
8.5
10
11.5
V
PWM section
Maximum duty cycle
93
97
100
%
Minimum duty cycle
0
%
Total standby current
Start-up current
0.5
1
mA
ICC
Operating supply current
VPIN 2=VPIN 3=0V
11
17
mA
VCC zener voltage
ICC=25mA
34
V
Maximum operating frequency section
Maximum operating frequency for all
functions operating cycle-by-cycle
400
kHz
NOTES:
1. These parameters, although guaranteed, are not 100% tested in production.
2. Parameter measured at trip point of latch with VPIN 2=0.
3. Gain defined as:
A
+
DV
PIN 1
DV
PIN 3
; 0
v V
PIN 3
v 0.8V
UNDERVOLTAGE LOCKOUT
UC3842
VON
16V
VOFF
10V
NOTE:
During Undervoltage Lock-Out, the output driver is biased to a high
impedance state. Pin 6 should be shunted to ground with a bleeder
resistor to prevent activating the power switch with output leakage current.
7
VCC
ON/OFF COMMAND
TO REST OF IC
VCC
VOFF
VON
ICC
<15mA
<1mA
ERROR AMP CONFIGURATION
NOTE:
Error AMP can source or sink up to 0.5mA.
2.5V
0.5mA
2
1
COMP
VFB
ZI
+


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