參數(shù)資料
型號(hào)： HA16120FPJ
廠商： Hitachi,Ltd.
英文描述： CAP 1000PF 25V 5% NP0(C0G) SMD-0603 TR-7 PLATED-NI/SN
中文描述： 開關(guān)穩(wěn)壓器的斬波式直流/直流轉(zhuǎn)換器
文件頁(yè)數(shù)： 13/38頁(yè)
文件大?。?/td> 275K
代理商： HA16120FPJ
HA16114P/PJ/FP/FPJ, HA16120FP/FPJ
13
5. Voltage Reference (Vref = 2.5 V)
5.1 Voltage Reference
A bandgap reference built into the IC (see figure 5.1) outputs 2.5 V ± 50 mV. The sawtooth oscillator,
PWM comparator, latch, and other internal circuits are powered by this 2.5 V and an internally-generated
voltage of approximately 3.2 V.
The voltage reference section shut downs when the IC is turned off at the ON/
OFF
pin as described later,
saving current when the IC is not used and when it operates in intermittent mode during overcurrent.
ON/OFF
+
1.25 V
1.25 V
25 k
25 k
V
IN
Vref
2.5 V
3.2 V
ADJ
Sub bandgap circuit
Main bandgap circuit
Figure 5.1 Vref Reference Circuit
5.2 Trimming the Reference Voltage (Vref and ADJ pins)
Figure 5.2 shows a simplified circuit equivalent to figure 5.1. The ADJ pin in this circuit is provided for
trimming the reference voltage (Vref). The output at the ADJ pin is a voltage V
ADJ
of 1.25 V (Typ)
generated by the bandgap circuit. Vref is determined by V
ADJ
and the ratio of internal resistors R
1
and R
2
as
follows:
Vref = V
ADJ
×
R
1
+ R
2
R
2
The design values of R
1
and R
2
are 25 k
with a tolerance of ±25%.
If trimming is not performed, the ADJ pin open can be left open.
+
V
IN
Vref
ADJ
R
R
25 k
(typ)
25 k
(typ)
1
2
V
BG
(bandgap voltage)
1.25 V (typ)
Figure 5.2 Simplified Diagram of Voltage Reference Circuit
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