CS51022ADBR2 ON Semiconductor, CS51022ADBR2 Datasheet - Page 10

• Manufacturer Part Number: CS51022ADBR2
• Description: IC CTRLR PWM ENH SYNC 16-TSSOP
• Manufacturer: ON Semiconductor

Specifications of CS51022ADBR2

• Pwm Type: Current Mode
• Number Of Outputs: 1
• Frequency - Max: 1MHz
• Duty Cycle: 83%
• Voltage - Supply: 8.2 V ~ 20 V
• Buck: Yes
• Boost: No
• Flyback: No
• Inverting: Yes
• Doubler: No
• Divider: No
• Cuk: No
• Isolated: No
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 16-TSSOP
• Frequency-max: 1MHz
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Synchronization
synchronize several controllers. When SYNC pins are
connected together, the converters will lock to the highest
switching frequency. The fastest controller becomes the
master, producing a 4.3 V, 200 ns pulse train. Only one, the
highest frequency SYNC signal, will appear on the SYNC
line.
Sleep
is placed in sleep mode when SLEEP is driven high. In sleep
mode, the controller and MOSFET are turned off. Connect
to GND for normal operation. The sleep mode operates at
VCC ≤ 15 V.
A bi−directional synchronization is provided to
The sleep input is an active high input. The CS51022A/4A
2500
2000
1500
1000
500
0
5
8
Figure 6. Frequency vs. R
4
5
10
3
2
7
1
6
15
20
Capacitor Values
25
R
T
CS51021A, CS51022A, CS51023A, CS51024A
(kΩ)
30
1. C
2. C
3. C
4. C
5. C
6. C
7. C
8. C
35
T
for Discrete
T
T
T
T
T
T
T
T
= 47 pF
= 100 pF
= 150 pF
= 220 pF
= 390 pF
= 470 pF
= 560 pF
= 680 pF
40
45
http://onsemi.com
50
10
Oscillator and Duty Cycle Limit
the R
1.5 V.
t
timing capacitor’s discharge current is trimmed, the
maximum duty cycle is well defined. It is determined by the
ratio between the timing resistor R
C
R
ON
100
T
T
The switching frequency is set by R
The maximum duty cycle is set by the ratio of the on time,
90
80
70
60
50
40
. Refer to figures 6 and 7 to select appropriate values for
and C
, and the whole period, T = t
T
5
C
5
T
T
pin. C
10
.
Figure 7. Duty Cycle vs. R
f SW +
15
T
1
charges and discharges between 3.0 V and
6
T SW
20
1
Capacitor Values
2
; T SW + t CH ) t DIS
25
R
T
30
7
(kΩ)
3
T
ON
and the timing capacitor
8
35
4
T
+ t
T
and C
for Discrete
1. C
2. C
3. C
4. C
5. C
6. C
7. C
8. C
40
OFF
T
T
T
T
T
T
T
T
T
. Because the
= 47 pF
= 100 pF
= 150 pF
= 220 pF
= 390 pF
= 470 pF
= 560 pF
= 680 pF
45
connected to
50
55