CS51021A ONSEMI [ON Semiconductor], CS51021A Datasheet - Page 5

• Manufacturer Part Number: CS51021A
• Description: Enhanced Current Mode PWM Controller
• Manufacturer: ONSEMI [ON Semiconductor]

ELECTRICAL CHARACTERISTICS
3.0 V < V
PACKAGE PIN DESCRIPTION
Current Sense
OV & UV Voltage Monitors
SOFT START (SS)
4. Guaranteed by design, not 100% tested in production.
16 Lead SO Narrow
OFFSET Voltage
Blanking Time
Blanking Disable Voltage
Second Current Threshold Gain
I
Minimum On Time
Gain
OV Monitor Threshold
OV Hysteresis Current
UV Monitor Threshold
UV Monitor Hysteresis
Charge Current
Discharge Current
Charge Voltage, V
Discharge Voltage, V
SENSE
PIN #
10
12
13
14
15
16
11
1
2
3
3
4
5
6
7
8
9
Input Resistance
C
Characteristic
< 20 V, 8.2 V < V
SLEEP (CS51022A/4A)
SYNC (CS51021A/3A)
PIN SYMBOL
SS
SLOPE
I
COMP
PGND
GATE
LGND
SENSE
R
V
I
V
V
OV
UV
SET
SS
V
T
REF
SS
CC
FB
C
C
T
CC
< 20 V, R
CS51021A, CS51022A, CS51023A, CS51024A
External power switch driver with 1.0 A peak capability.
Current sense amplifier input.
Bi−directional synchronization. Locks to the highest frequency.
Active high chip disable. In sleep mode, V
Additional slope to the current sense signal. Internal current source charges the external capacitor.
Undervoltage protection monitor.
Overvoltage protection monitor.
Timing resistor R
Voltage at this pin sets pulse−by−pulse overcurrent threshold, and second threshold (1.33 times
higher) with Soft Start retrigger (hiccup mode).
Feedback voltage input. Connected to the error amplifier inverting input.
Error amplifier output. Frequency compensation network is usually connected between COMP and
V
Charging external capacitor restricts error amplifier output voltage during the start or fault
conditions (hiccup).
Logic ground.
5.0 V reference voltage output.
Logic supply voltage.
Output power stage ground connection.
Output power stage supply voltage.
(Note 4)
Adjust V
GATE High to Low
(Note 4)
SS = 2.0 V
SS = 2.0 V
FB
T
(Unless otherwise stated, specifications apply for −40°C < T
pins.
= 12 kW, C
FB
Test Conditions
T
T
= 390 pF)
and capacitor C
http://onsemi.com
−
−
−
−
−
−
−
−
−
5
T
determine oscillator frequency and maximum duty cycle, D
REF
FUNCTION
and GATE are turned off.
0.09
1.21
0.78
1.38
0.25
Min
−10
−70
250
1.8
2.4
4.4
30
25
−
−
A
< 85°C, −40°C < T
−12.5
1000
0.10
1.33
0.80
1.45
0.27
Typ
−55
2.0
5.0
2.5
4.7
55
70
75
1.45
0.82
1.52
0.30
Max
0.11
160
−15
100
−40
110
2.2
2.6
5.0
J
−
−
< 150°C,
Unit
V/V
V/V
mV
MAX.
kW
mA
mA
mA
ns
ns
V
V
V
V
V
V