参数资料
| 型号： | MC44604PG |
| 厂商： | ON Semiconductor |
| 文件页数： | 14/22页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR FLYBACK PWM 16-DIP |
| 产品变化通告： | Product Obsolescence 19/Dec/2008 |
| 标准包装： | 500 |
| 系列： | GreenLine™ |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 250kHz |
| 占空比： | 82% |
| 电源电压： | 10 V ~ 15 V |
| 降压： | 无 |
| 升压： | 无 |
| 回扫： | 是 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -25°C ~ 85°C |
| 封装/外壳： | 16-DIP（0.300"，7.62mm） |
| 包装： | 管件 |
| 其它名称： | MC44604PGOS |
MC44604
Error Amplifier
A fully compensated Error Amplifier with access to the
inverting input and output is provided. It features a typical
DC voltage gain of 70 dB. The non ? inverting input is
internally biased at 2.5 V and is not pinned out. The
converter output voltage is typically divided down and
monitored by the inverting input. The maximum input bias
current with the inverting input at 2.5 V is ? 2.0 m A. This can
cause an output voltage error that is equal to the product of
the input bias current and the equivalent input divider source
resistance.
The Error Amp Output (Pin 13) is provided for external
loop compensation. The output voltage is offset by two
diodes drops ( [ 1.4 V) and divided by three before it
connects to the inverting input of the Current Sense
Comparator. This guarantees that no drive pulses appear at
the Source Output (Pin 3) when Pin 13 is at its lowest state
(V OL ). This occurs when the power supply is operating and
the load is removed, or at the beginning of a soft ? start
interval. The Error Amp minimum feedback resistance is
Current Sense Comparator and PWM Latch
The MC44604 can operate as a current mode controller
and/or as a voltage mode controller. In current mode
operation, the MC44604 uses the current sense comparator,
where the output switch conduction is initiated by the
oscillator and terminated when the peak inductor current
reaches the threshold level established by the Error
Amplifier output (Pin 13). Thus the error signal controls the
peak inductor current on a cycle ? by ? cycle basis. The
Current Sense Comparator PWM Latch configuration used
ensures that only a single pulse appears at the Source Output
during the appropriate oscillator cycle.
The inductor current is converted to a voltage by inserting
the ground referenced sense resistor R S in series with the
power switch Q1.
In normal mode, this voltage is monitored by the Current
Sense Input (Pin 7) and compared to a level derived from the
Error Amp output. The peak inductor current under normal
operating conditions is controlled by the voltage at Pin 13
where:
* 1· 4 V
S
limited by the amplifier’s minimum source current (0.2 mA)
and the required output voltage (V OH ) to reach the current
sense comparator ’s 1.0 V clamp level:
I
pk
[
V
(pin13)
3R
f (min)
R
[
3 · 0(1 · 0 V) ) 1· 4 V
0 · 2 mA
+ 22 k Ω
The Current Sense Comparator threshold is internally
clamped to 1.0 V. Therefore the maximum peak switch
current is:
S
Compensation
+
1.0 mA
I
pk(max)
[
1· 0 V
R
R f
+
V OSC
(from Oscillator)
R FB
C 1
R 1
13
14 2.5 V
Voltage
Feedback
Input
Foldback 5
Input
Pin 12
R 2
Error
Amplifier
4.7 W
2R
R
GND
Current
Sense
Comparator
1.0 V
4
V OSCPROT
V demag out
S
Thermal R Q
Protection PWM
UVLO
R Latch
V C
14
3
R 2
V in
R 3
Q1
MC44604
Figure 28. Error Amplifier Compensation
In a preferred embodiment, the feedback signal (current)
Current Sense
Comparator
Substrate
Current
Sense
7
C
R
R S
is drawn from the pin 12 that is connected to the pin 15 in
normal mode (Note 1). Using a resistor connected on pin 12,
this current generates a voltage that is the input signal of the
error amplifier arrangement.
Note 1. The error amplifier is not used in the standby mode
regulation.
Figure 29. Output Totem Pole
Oscillator
The oscillator is a very accurate sawtooth generator.
http://onsemi.com
14
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