MC34060ADR2G ON Semiconductor, MC34060ADR2G Datasheet - Page 5

• Manufacturer Part Number: MC34060ADR2G
• Description: IC CTRLR PWM FF SGL END 14-SOIC
• Manufacturer: ON Semiconductor

Specifications of MC34060ADR2G

• Pwm Type: Voltage Mode
• Number Of Outputs: 1
• Frequency - Max: 200kHz
• Duty Cycle: 100%
• Voltage - Supply: 7 V ~ 40 V
• Buck: Yes
• Boost: Yes
• Flyback: Yes
• Inverting: Yes
• Doubler: No
• Divider: No
• Cuk: No
• Isolated: Yes
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 14-SOIC (3.9mm Width), 14-SOL
• Frequency-max: 200kHz
• Topology: Flyback
• Output Voltage: 30 V
• Output Current: 200 mA
• Switching Frequency: 200 KHz
• Duty Cycle (max): 96 %
• Operating Supply Voltage: 15 V
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C
• Fall Time: 40 ns
• Mounting Style: SMD/SMT
• Rise Time: 100 ns
• Synchronous Pin: No
• Number Of Pwm Outputs: 1
• On/off Pin: No
• Adjustable Output: No
• Switching Freq: 200KHz
• Operating Supply Voltage (max): 40V
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 14
• Package Type: SOIC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Description
modulation control circuit, incorporating the primary
building blocks required for the control of a switching power
supply (see Figure 1). An internal−linear sawtooth oscillator
is frequency−programmable by two external components,
R
determined by:
T
The MC34060A is a fixed−frequency pulse width
and C
Dead-Time
T
R
Control
. The approximate oscillator frequency is
For more information refer to Figure 3.
T
C
T
f
Dead-Time Control
osc
6
5
4
Feedback/P.W.M.
Comparator
^
Capacitor C
Error Amp
1
1
Output Q
R
Emitter
T
1.2
2
• C
T
+
-
1
T
,
1
≈ 0.7mA
Oscillator
0.12V
0.7V
Comparator Input
Feedback/PWM
This device contains 46 active transistors.
3
Figure 2. Timing Diagram
Figure 1. Block Diagram
http://onsemi.com
-
+
-
+
Comparator
Dead-Time
Comparator
PWM.
2
5
+
-
13
Error Amp
comparison of the positive sawtooth waveform across
capacitor C
enabled only during that portion of time when the sawtooth
voltage is greater than the control signals. Therefore, an
increase in control−signal amplitude causes a corresponding
linear decrease of output pulse width. (Refer to the Timing
Diagram shown in Figure 2.)
2
Output pulse width modulation is accomplished by
Undervoltage
14
Lockout
T
to either of two control signals. The output is
-
+
Reference
Regulator
7
GND
V
TH
Q1
10
12
8
9
Collector
Ref Out
Emitter
V
CC